Quiz
Test 2
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Perguntas do quiz (200)
1What will the output of show mpls ldp discovery show?
You are bringing a new MPLS router online and have configured only what is shown to bring LDP up.
Assume that the peer has been configured in a similar manner. You verify the LDP peer state and
see that there are no neighbors. What will the output of show mpls ldp discovery show?
- AA.
Interfaces:
Ethernet0/0 (ldp): xmit - BB.
Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 25.25.25.2:0; IP addr: 192.168.12.2 - CC.
Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 192.168.12.2:0; no route - DD.
Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 25.25.25.2:0; no route
- AA.
2What is the difference between Link LDP and targeted LDP?
- AA. Link LDP uses port 646 and targeted LDP uses port 711.
- BB. LDP Hellos use unicast UDP for targeted and multicast UDP for link.
- CC. Link LDP uses UDP for discovery and targeted LDP uses TCP for discovery.
- DD. Link LDP uses port 711 and targeted LDP uses port 646.
- EE. None of the above are true.
3When a link flaps, an mpls Idp session will also flap. Which feature minimizes traffic loss and provides faster convergence after the link is re-established?
- AA. BFD
- BB. MPLS LDP IGP SYNC
- CC. graceful restart
- DD. LDP session protection
- EE. LDP nonstop routing
4On a Cisco router, when will the router actually reserve the bandwidth for the MPLS traffic
engineering tunnel?- AA. during the autoroute process
- BB. during constraint-based routing calculations
- CC. on the receipt of the RSVP Path message
- DD. on the receipt of the RSVP Resv message
5Which cisco IOS command should be used to verify that frames are being forwarded on a VC by an egress PE?
- AA. Show MPLS forwarding tables
- BB. Show MPLS interface forwarding
- CC. Show 12 VPN counters forwarding session
- DD. Show 12 VPN counters forwarding statistics
6Which command should be used to verify that IS-IS has been properly configured to support MPLS TE?
- AA. Show mpls isis traffic-eng advertisements
- BB. Show isis mpls traffic-eng adjacency-log
- CC. Show isis mpls traffic-eng advertisements
- DD. Show isis mpls traffic-eng tunnel
- EE. Show mpls isis traffic-eng adjacency-log
7Which statement about LSP ping is true?
- AA. LSP ping access ICMP packets
- BB. A successful LSP ping ensures that the echo-reply are labled
- CC. If an IP ping exceeds, than an LSP ping succeed if MPLS is enabled along the path
- DD. A successful LSP ping validates reachability to the destination along the MPLS data plane
8What does the auto tunnel template interface configure?
- AA. MPLS TE tunnel mesh groups
- BB. Virtual private LAN services
- CC. MPLS VPN VRF instances
- DD. MP-BGP peering
- EE. LDP tunnels
- FF. MPLS TE tunnel dynamic route
9Refer to the exhibit. The commands were exceeded on the cisco XR 12000 P
E. Which statement is true?
- AA. The outer label for prefix 10.22.22.22 is 143989.
- BB. The outer label for prefix 10.22.22.22 is 16000.
- CC. The outer label for prefix 10.22.22.22 is implNull.
- DD. Prefix 10.22.22.22 has no outer label.
10Refer to the exhibit. With this template configured and applied to cisco XR 12000series Router, could a CPE device use the traceroute command to reveal the core network?
- AA. Yes, traceroute is not disabled.
- BB. Yes, discovery targeted-hello accept allows it
- CC. No it is disabled with mpls ip-ttl-propagate disable
- DD. No, session protection stops traceroute
- EE. Only if traceroute mpls was used
- FF. Only if traceroute 6 was used
1191) What function does the penultimate LSR perform to help optimize MPLS?
- AA. Pops the label before packet reaches the PE router
- BB. Restore the original ingress settings to the EXP field
- CC. Ensure that the LSP is Taking the shortest path
- DD. Verifies that there are no loops in the path
12In the diagram, R1 is the head-end of a TE tunnel that terminates on R5. The red line indicates the protected link, and the gold line indicates the backup tunnel. Which router is the Point of Local Repair?
- AA. R2
- BB. R5
- CC. R3
- DD. R1
- EE. R4
13Which methods would enable traffic to be forwarded along an MPLS TE tunnel (Choose 4.)
- AA. MP-BGP routing
- BB. Static routing
- CC. Policy routing
- DD. Autoroute
- EE. Forwarding adjacency
14In the context of MPLS Traffic engineering, TE path calculation is conducted by:
- AA. TE middle point
- BB. TE tail end
- CC. Independent server
- DD. All TE nodes along the path
- EE. TE head end
15Which two routing protocols support MPLS traffic engineering link information distribution? (Choose two)
- AA. OSPF
- BB. BGP
- CC. RIP version 2
- DD. IS-IS
- EE. EIGRP
16Which statements are correct for forwarding traffic into MPLS TE tunnels? (Choose 3)
- AA. Autoroute causes the tunnel to be treated as a directly connected link to the head-end.
- BB. Autoroute causes the TE head-end to establish IGP adjacency with the tail-end over the tunnel.
- CC. Forwarding adjacency makes the TE head-end node advertise the Tunnel LSP into the IGP.
- DD. Forwarding adjacency supports unequal cost load balancing over multiple TE tunnels.
17Which three statements about MPLS traffic engineering (MPLS TE) are true? (Choose three)
- AA. MPLS TE supports admission control
- BB. MPLS TE tunnel traffic is a link attribute to compute the TE tunnel path
- CC. MPLS TE uses BGP extension to advertise link attributes
- DD. MPLS TE provides protection capability
- EE. MPLS TE uses RSVP to establish LSP
18Which of these is not a component of MPLS traffic engineering?
- AA. trunk admission control
- BB. forwarding traffic to tunnel
- CC. information distribution
- DD. path selection, calculation, and setup
- EE. traffic patterns prediction
19Where are MPLS point-to-multipoint traffic engineering packets replicated?
- AA. head-end router
- BB. branch-point router
- CC. midpoint router
- DD. leaf-point router
- EE. tail-end router
20Which statement about MPLS Traffic Engineering class-based tunnel selection (CBTS) is not true?
- AA. Local mechanism is at the middle-point router.
- BB. EXP selection is between multiple tunnels to the same destination
- CC. Bundle members are configured with EXP values to carry.
- DD. The tunnel selection is configured on the tunnel master.
- EE. The tunnel master bundles the tunnel members
21What form of label distribution is used by RSVP-TE?
- AA.
Unsolicited downstream - BB.
Upstream-on-demand - CC.
Unsolicited upstream - DD.
Downstream-on-demand
- AA.
22What is the default maximum reservable bandwidth (percentage) by any single flow on an
interface after enabling RSVP?- AA.
75 percent - BB.
60 percent - CC.
56 percent - DD.
50 percent - EE.
25 percent
- AA.
23Which two are characteristics of RSVP? (Choose two.)
- AA.
RSVP itself provides bandwidth and delay guarantees. - BB.
For RSVP to be end-to-end, all devices must support RSVP. - CC.
RSVP reservations are maintained by a centralized reservations server. - DD.
An RSVP compatible QoS mechanism must be used to implement guarantees according to
RSVP reservations.
- AA.
24Which two statements are true about RSVP and the IntServ QoS model?
- AA.
A drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol. - BB.
RSVP uses DSCP to signal QoS requirements to routers. - CC.
RSVP is a routing protocol. - DD.
RSVP is an IP protocol that uses IP protocol ID 46, and TCP/UDP ports 3455. - EE.
RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic. - FF.
The flow-based approach of RSVP is ideal for large, scalable implementations such as the public Internet.
- AA.
25Which of the following commands is used in interface configuration mode to enable RSVP?
- AA.
ip rsvp sender - BB.
ip rsvp reservation - CC.
ip rsvp bandwidth - DD.
ip rsvp mode
- AA.
26Which of the characteristics below is associated with the (QoS) Integrated Services Model?
- AA.
QoS classified at layer 3 using IP precedence or DSCP. - BB.
Guaranteed rate service. - CC.
Implemented using FIFO queues. - DD.
All traffic has an equal chance of being dropped.
- AA.
27What is NOT true about an explicit LSP tunnel?
- AA.
They can be set up using RSVP or CR-LDP. - BB.
They can be configured manually. - CC.
Uses include the ability to implement load balancing over unequal paths. - DD.
The tunnels cannot be included in the IGP shortest path calculation.
- AA.
28You want to enable PFE fast reroute for the MPLS nodes that are acting as bypass routers for multiple MPLS LSPs.
Which action must you take to facilitate this behavior?- AA. Apply a load balancing policy to the forwarding tables of the bypass routers.
- BB. Apply the RSVP fast reroute feature on the bypass routers.
- CC. Apply the MPLS link protection feature on the bypass routers.
- DD. Apply the RSVP load balance feature on the ingress and the bypass routers.
29You are setting up MPLS RSVP LSPs between R1 and R6 through your core network. You must ensure that R1 has redundant ERO paths. If the main path fails and moves traffic to a second path, it should not switch back to the original path automatically. Which two actions will accomplish these requirements? (Choose two.)
- AA. Create two secondary paths.
- BB. Create a primary path with a revert timer of 0 and create a secondary path.
- CC. Create two primary paths.
- DD. Create a primary path with the revert timer set to 255 and create a secondary path.
30You are setting up MPLS RSVP LSPs between R1 and R6 through your core network. You must ensure that the R1 has redundant ERO paths. You must also ensure that both paths are signaled and ready for traffic.
Which action will accomplish these requirements?- AA. Create two primary paths.
- BB. Create a primary path and create a secondary path.
- CC. Create a primary path and create a secondary path with the standby parameter.
- DD. Create a primary path and create a secondary path with the active parameter.
31You are deploying an MPLS network that uses traffic engineering. You are asked to formulate a plan to engineer LSPs and must identify configurable user inputs to do this. Which three inputs would be used? (Choose three.)
- AA. Bandwidth requirement
- BB. Source prefix
- CC. Explicit route
- DD. Protocol type
- EE. Administrative group
32Which two statements are true regarding the CSPF algorithm? (Choose two.)
- AA. LSPs with higher numerical setup priorities are computed before LSPs with lower setup priority values.
- BB. LSPs with lower numerical setup priorities are computed before LSPs with higher setup priority values.
- CC. The selected path for a given LSP is passed to RSVP in the form of an ERO.
- DD. The selected path for a given LSP is passed to the TED in the form of an ERO.
33You want to ensure your multivendor MPLS core network does not decrease the TTL when using ping and traceroute from IP endpoints. Which configuration parameter satisfies this requirement?
- AA. no-decrement-ttl, configured on all routers in the path
- BB. no-decrement-ttl, configured on the ingress router only
- CC. no-propagate-ttl, configured on all routers in the path
- DD. no-propagate-ttl, configured on the ingress router only
34You want to ensure that your all-Junos MPLS core network does not decrease the TTL when using ping and traceroute from IP endpoints. Which two configuration parameters satisfy this requirement? (Choose two.)
- AA. no-decrement-ttl, configured on all routers in the path
- BB. no-decrement-ttl, configured on the ingress router only
- CC. no-propagate-ttl, configured on all routers in the path
- DD. no-propagate-ttl, configured on the ingress router only
35You have configured an MPLS LSP that includes defined hops. For this path, you want the MPLS label to be popped at the egress node.
Which configuration statement meets this requirement?- AA. Set protocols rsvp explicit-null, configured on the ingress node
- BB. Set protocols mpls explicit-null, configured on the egress node
- CC. Set protocols mpls explicit-null, configured on the ingress node
- DD. Set protocols rsvp implicit-null, configured on the egress node
36interface tunnel 1
tunnel destination 10.10.10.10
ip unnumbered loopback0
tunnel mode mpls traffic-eng
tunnel mpls traffic-eng affinity 0x0 mask 0x1
tunnel mpls traffic-eng autoroute announce
tunnel mpls traffic-eng bandwidth 155000
tunnel mpls traffic-eng fast-reroute
tunnel mpls traffic-eng path-option 5 dynamic
tunnel mpls traffic-eng path-option 6 explicit name path-list1 tunnel mpls traffic-eng priority 7 7
tunnel mpls traffic-eng record-route
From the MPLS-TE configuration above, one can conclude that:- AA.
Path Option 6 will be attempted first because explicit paths are always preferred over dynamic paths. - BB.
Path Option 5 will be attempted first because dynamic paths are always preferred over explicit paths. - CC.
Path Option 5 is attempted first because path options are attempted in sequence – lowest to highest. - DD.
This is not valid output.
- AA.
37You have designed and implemented MPLS-TE for fast router in your network core. Your network core consists of Cisco CRS-1 carrier routing System devices interconnected using XDM and Sonet Transport. You are using OSPF as the IGP, and MP-BGP is running on the PE devices to support Layer 3 VPN services. You are offering voice service over VPN circuits. So you want a link convergence of no greater than 100ms. Which option should you use for faster link failure detection and to improve the performance of your network?
- AA.
Use OSPF fast hello packets with dead-interval and hello multiplier - BB.
Reduce MP-BGP hello timers between the neighbors - CC.
Configure MPLS-TE tunnels with the dynamic backup option - DD.
Configure MPLS-TE tunnels to autoroute announce - EE.
Configure BFD on the core links with the appropriate BFD multiplier.
- AA.
38You have configured a MPLS-TE tunnel with a predefined explicit path as primary and dynamic path as the backup. The tunnel was designed to carry customer traffic from site A to site B. although the MPLS-TE tunnel is set up. It is not carrying the traffic. Traffic has to go to net work 171.68.0.0/16 connected to site B. Which three show commands would you use to identify and resolve the issue?
- AA.
Show mpls traffic-eng-link-management bandwidth to check the bandwidth is available. - BB.
Shoe ip cef network-number to check if tabs are imposed - CC.
Show mpls traffic-eng topology ipg-id ospf network number brief to check routing issue - DD.
Show mpls traffic-eng autoroute to check auto routing is enabled - EE.
Show mpls forwarding-table LABEL-number details to outgoing tags - FF.
Show ip cef tunnel 1 to check traffic is passing through the tunnel
- AA.
39Which of the following technologies can improve convergence time following a link failure in a
service provider network? (Choose two.)- AA.
RSVP - BB.
MPLS TE FR - CC.
MPLS VPN - DD.
SNMP - EE.
BFD - FF.
VPLS
- AA.
40In MPLS networks, what is the benefit of disabling TTL propagation?
- AA.
to improve MPLS convergence time - BB.
to improve the IGP convergence time - CC.
to hide visibility to the core (provider) routers in the MPLS network - DD.
to provide a visible extension of IP TTL functionality in an MPLS-enabled domain - EE.
to provide a visible extension of MPLS TTL functionality in a non-MPLS-enabled domain
- AA.
41Which option is a BFD design consideration?
- AA.
BFD should not be used with RSVP-TE backup tunnels. - BB.
BFD echo mode may reduce convergence time. - CC.
BFD does not support sessions over MPLS LSPs. - DD.
BFD is supported on indirectly connected peers.
- AA.
42Which three statements about the Cisco MPLS TE Fast Reroute (FRR) process are true? (Choose
three.)- AA.
TE tunnels that are configured with the FRR option cannot be used as backup tunnels. - BB.
TE tunnels that are configured with the FRR option can be used as backup tunnels. - CC.
The backup tunnel that is used to protect a physical interface must have a valid IP address
configured. - DD.
Interfaces must use MPLS global label allocation. - EE.
The source IP address of use backup tunnel and the merge point (MP) should not be
reachable.
- AA.
43Which statement about MPLS TE Fast Reroute (FRR) link protection operation is not true?
- AA.
It requires a next-hop backup tunnel. - BB.
The backup tunnel terminates on the same tail-end router as the primary tunnel. - CC.
The point of local repair (PLR) swaps the label and pushes the backup label. - DD.
The restoration time is expected to be under 50 ms. - EE.
The backup tunnel can have associated bandwidth capacity
- AA.
44 Which statement about MPLS TE Fast Reroute (FRR) node protection operation is not correct?
- AA.
It requires a next-next hop backup tunnel. - BB.
Point of local repair (PLR) swaps the next hop label and pushes the backup label. - CC.
The backup tunnel terminates on the merge point (MP) where traffic rejoins the primary tunnel. - DD.
The backup tunnel can have associated bandwidth capacity. - EE.
Restoration time is expected under 50 ms.
- AA.
45Which DiffServ PHB classification is recommended by Cisco for interactive video traffic?
- AA.
AF41 - BB.
AF31 - CC.
CS3 - DD.
CS4 - EE.
EF
- AA.
46What are the PHBs that DiffServ use?
- AA.
resource reservation and admission control - BB.
default, AF, and EF PHBs - CC.
AF, EF, and CS PHBs - DD.
AF and EF PHBs - EE.
default, AF, EF, and CS PHBs
- AA.
47What is the total number of differentiated services code point bits in the DiffServ field?
- AA.
2 - BB.
4 - CC.
6 - DD.
8
- AA.
48How does DiffServ deliver QoS across the network?
- AA.
DiffServ classifies and marks traffic at each node in the network. - BB.
When using DiffServ, the network tries to deliver a particular kind of service that is based on the
QoS that is specified by each packet. - CC.
DiffServ tries to deliver a particular level of service on a per-flow basis across the network. - DD.
DiffServ delivers a particular kind of service based on either a flow-based behavior or a per-hop
behavior, depending on how the traffic was marked and classified at ingress.
- AA.
49What are the two differences between the IntServe and DiffServ models of QoS? (Choose two.)
- AA.
DiffServ provides absolute QoS guarantees. - BB.
IntServ is the default QoS mechanism for all routers, because applications signal the router with
the QoS level they require. - CC.
DiffServ inherits the connection-oriented approach from telephony network design. Every
individual communication must explicitly specify its traffic descriptor and requested resources to
the network. - DD.
With IntServ, packet delivery is guaranteed. However, the use of IntServ can severely limit the
scalability of a network. - EE.
DiffServ was designed to overcome the limitations of both the best-effort and IntServ models
and can provide an “almost guaranteed” QoS.
- AA.
50Which two models are the models of DiffServ-Aware Traffic Engineering? (Choose two)
- AA.
Policy-based Model - BB.
Class based Model - CC.
Russian Doll Model - DD.
Global Tunnel Model - EE.
Maximum Allocation Model
- AA.
51DSCP value “101110” looks like which IP Precedence value to non-DiffServ compliant devices?
- AA.
IP Precedence 6 - BB.
IP Precedence 4 - CC.
IP Precedence 3 - DD.
IP Precedence 5 - EE.
IP Precedence 2 - FF.
IP Precedence 7
- AA.
52What are two characteristics of the DiffServ model? (Choose two)
- AA.
service guarantee - BB.
traffic that is divided into classes - CC.
not scalable to large implementations - DD.
QoS mechanisms that are used without prior signaling - EE.
applications that signal their particular QoS and bandwidth requirements
- AA.
53Which two statements about the DiffServ model are true? (Choose two)
- AA.
A class can be identified as a single application, multiple applications with similar service needs, or be based on the source or destination IP address. - BB.
A drawback of the DiffServ model is that it does not provide backward compatibility with devices that can only use the ToS field. - CC.
DiffServ uses the DiffServ field in the MAC header to mark frames into behavior aggreages (BAs). - DD.
The DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field. - EE.
The first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol (RSVP) value. - FF.
The primary goal of DiffServ is scalability.
- AA.
54Which two statements about the DiffServ QoS model are true? (Choose two)
- AA.
DiffServ requires RSVP to set up a path through the network to accomodate the requested QoS. - BB.
Network traffic is identified by class, and the level of service os chosen for each class. - CC.
The DiffServ model relies of a fairly simple mechanism to provide QoS over a wide range of equipment. - DD.
RSVP enables the DiffServ model to provide end-to-end QoS. - EE.
The DiffServ model is more scalable than the IntServ model. - FF.
The flow-based approach of the DiffServ model is ideal for large scalable implemetations such as the public
- AA.
55Which three DiffServ QoS mechanisms are enabled by AutoQoS? (Choose three)
- AA.
congestion management with CQ - BB.
traffic policing using CAR - CC.
traffic classification using NBAR - DD.
traffic classification using WRED - EE.
traffic shaping with class-based shaping - FF.
congestion avoidance using WRED
- AA.
56What are two key advantages of the DiffServ model? (Choose two.)
- AA.
It is highly scalable - BB.
It provides many possible levels of service - CC.
It provides completely guaranteed quality of service - DD.
It works seamlessly with very little network configuration - EE.
It reserves bandwidth explicitly for each level of service
- AA.
57Which two components are associated with the DiffServ model? (Choose two.)
- AA.
hop-by-hop signaling - BB.
per-hop behavior - CC.
RSVP - DD.
Hard QoS - EE.
DSCP use of class selector
- AA.
58What makes the DiffServ model more scalable than the IntServ model? (Choose all that apply.)
- AA.
DiffServ makes use of per-aggregate QoS instead of per-flow QoS. - BB.
DiffServ makes use of hop-by-hop signaling which allows DiffServ to scale to a larger number of application flows. - CC.
DiffServ is capable of implementing admission control either locally on the routers or be offloaded to a central policy server using the COPS protocol. - DD.
DiffServ routers are not compelled to track the state information for each individual flow.
- AA.
59What are two benefits of using the DiffServ model? (Choose two.)
- AA.
DiffServ is a flow-based architecture. - BB.
DiffServ is highly scalable. - CC.
DiffServ keeps flow state on each node in the network. - DD.
DiffServ supports a large number of service classes. - EE.
DiffServ uses repetitive signaling for each flow.
- AA.
60What are two methods to achieve differentiated QoS in MPLS? (Choose two)
- AA.
By creating a separate Label Switch Path for each class. - BB.
By using the experimental bits to identify the different classes. - CC.
By using the DiffServ Codepoints to identify the different classes. - DD.
By using the TOS bits in the Layer 3 header to identify the different classes.
- AA.
61In the DiffServ model, which class represents the highest priority with the highest drop probability?
- AA.
AF11 - BB.
AF13 - CC.
AF41 - DD.
AF43
- AA.
62In the DiffServ model, which class represents the lowest priority with the lowest drop probability?
- AA.
AF11 - BB.
AF13 - CC.
AF41 - DD.
AF43
- AA.
63Which of the available quality of service models offers the greatest amount of scalability while
maintaining service quality?- AA.
Diffserv - BB.
IntServ - CC.
Best Effort - DD.
PriServ
- AA.
64Which two benefits are of applying WRED? (Choose two.)
- AA.
helps to avoid TCP synchronization - BB.
allows a different drop profile to be manually enabled for each IP precedence or DSCP - CC.
provides minimal bandwidth guarantees - DD.
provides bounded low latency
- AA.
65Refer to the exhibit. As a network administrator, you have configured a dual-rate, dual-bucket
policer in accordance with RFC 2698 on the serial interface of you router, connecting to your
provider. The SLA with your provider states that you should only send AF31 (limited to 150 kb/s),
AF32 (limited to 50 kb/s)and AF33 (best effort). Your service provider claims you are not
conforming to the SLA. Which two things are wrong with this configuration? (Choose two.)
- AA.
The configuration of a service policy on half-duplex Ethernet interfaces is not supported. - BB.
The class class-default sub-command of the policy-map limit command should be set to the
DSCP default. - CC.
The violate action is wrong. - DD.
This policer configuration is not implementing RFC 2698 dual-bucket, dual-rate. - EE.
The policer is configured in the wrong class.
- AA.
66Which four pieces of information are stored for each prefix in the LFIB? (Choose four.)
- AA.
local label - BB.
outgoing label - CC.
next-hop IP address - DD.
outgoing interface - EE.
incoming interface - FF.
Layer 2 header rewrite information
- AA.
67Which IOS QoS enhancement was created to address scalability and bandwidth guarantee
issues?- AA.
DiffServ - BB.
IntServ - CC.
RSVP - DD.
WFQ
- AA.
68Which QoS model makes use of ther Resource Reservation Protocol (RSVP)?
- AA.
Best Effort - BB.
DiffServ - CC.
IntServ - DD.
NBAR - EE.
DSCP
- AA.
69In which QoS model do applications signal the network that they require certain QoS parameters?
- AA.
Hierarchical - BB.
Best Effort - CC.
IntServ - DD.
DiffServ - EE.
WFQ - FF.
CBWFQ
- AA.
70What are the three steps to implement a QoS policy in a network? (Choose three)
- AA.
Label each class. - BB.
Divide traffic into classes. - CC.
Choose DiffServ ot IntServ as the QoS model. - DD.
Identify traffic requirements. - EE.
Define QoS policies for each class. - FF.
Configure ACLs to define queues.
- AA.
71Which binary pattern is a valid class selector PHB DSCP value?
- AA.
110001 - BB.
000010 - CC.
111000 - DD.
000001
- AA.
72What are the four types of per-hop behavior used with DSCP? (Choose four)
- AA.
Expedited forwarding - BB.
Default - CC.
Class-bit - DD.
Assured forwarding - EE.
Class-selector - FF.
Express forwarding
- AA.
73What is the class selector PHB used for in the differentiated services model?
- AA.
Best-effort service - BB.
Low-delay service - CC.
Bandwidth guarantee - DD.
Backward compatibility
- AA.
74When using Diffserv, what is the name of the field which determines the PHB for a packet?
- AA.
EF - BB.
EOF - CC.
DSCP - DD.
AF - EE.
QPPB
- AA.
75According to the best practices, which statement is true as related to the QoS policy that should be implemented on the outbound provider (P) to provider (P) router link in a service provider network that is supporting both VoIP and data?
- AA.
CBWFQ and CB-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic. - BB.
LLQ and CB-WRED should be implemented on the P router egress to support both VoIP and data traffic. - CC.
CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic. - DD.
In the DiffServ model, ingress and egress QoS mechanisms are only required on the provider edge (PE) routers, so no QoS policy is needed on the P to P link.
- AA.
76For which service is assured forwarding PHB used?
- AA.
best effort - BB.
expedited forwarding - CC.
guaranteed bandwidth - DD.
class selector
- AA.
77Which three characteristics are drawbacks to the use of a best-effort with over-provisioning backbone design? (Choose three.)
- AA.
The design costs more to implement than a DiffServ backbone. - BB.
Denial of Service attacks on one service can affect all network traffic. - CC.
The design uses a different over-provisioning ratio for the different traffic classes. - DD.
It requires complex QoS mechanisms at the network edge. - EE.
It requires complex QoS mechanisms at the network core. - FF.
Unplanned network failures can cause unexpected congestion in the network.
- AA.
78According to the best practices, in a service provider network, which statement is true as related to the QoS policy that should be implemented on the inbound provider (P) to provider (P) router link?
- AA.
Traffic policing should be implemented to rate-limit the ingress traffic into the P router. - BB.
Because traffic should have already been policed and marked on the upstream ingress PE router, no input QoS policy is needed on the P to P link. - CC.
Class-based marking should be implemented because it will be needed for the class-based queuing that will be used on the P router output. - DD.
In the DiffServ model, all ingress and egress QoS processing are done at the network edge (for example, PE router), so no input or output QoS policy will be needed on the P to P link.
- AA.
79Which of these is a valid differentiated services PHB?
- AA.
Guaranteed PHB - BB.
Class-Selector PHB - CC.
Reserved Forwarding PHB - DD.
Discard Eligible PHB - EE.
Priority PHB
- AA.
80Which two IntServ functions are required on a router? (Choose two)
- AA.
admission control - BB.
DSCP classification - CC.
monitoring - DD.
marking - EE.
scheduling
- AA.
81Which statement is true about the IntServ QoS model?
- AA.
QoS traffic flows are managed on a hop-by-hop basis. - BB.
QoS traffic flows are guaranteed end-to-end. - CC.
QoS policies are not implemented, relying on best-effort delivery of packets. - DD.
QoS policies require that traffic be divided into classes.
- AA.
82Which three network services can be implemented using MPLS within the service provider IP NGN
core? (Choose three.)- AA.
Layer 2 VPNs - BB.
Layer 3 VPNs - CC.
traffic engineering - DD.
IntServ traffic engineering tunnels - EE.
encrypted LSPs
- AA.
83Which item is not available to be used for QoS classification in Cisco IOS XR?
- AA.
MAC SA - BB.
protocol - CC.
inner EXP - DD.
discard-class - EE.
QoS-group - FF.
VLAN
- AA.
84What is the main purpose of QoS classification?
- AA.
To set fields in IP packets and identify that packet as belonging to a specific class of service. - BB.
To signal network devices on which QoS mechanism should be employed to meet the requirements of a particular service class. - CC.
To identify traffic as belonging to a specific class of service. - DD.
To provide a mapping between link layer and network layer QoS.
- AA.
85QoS preclassification is a term used to describe what Cisco IOS feature?
- AA.
AutoQoS - BB.
Modular QoS Command-Line Interface - CC.
QoS for VPNs - DD.
AutoSecure
- AA.
86What is the function of Modular QoS Command Line Interface (MQC) classification?
- AA.
to identify traffic independently of QoS polices - BB.
to mark traffic based on the Class Latency index (CLI) - CC.
to route traffic based on the multiple QoS policies - DD.
to group QoS configuration commands into modules to ease configuration - EE.
To aggregate traffic onto one QoS classification for operational efficiency (CPU and Memory)
- AA.
87Which two Cisco AutoQoS configuration statements are true? (Choose two)
- AA.
The auto discovery qos command is supported on serial interfaces, subinterfaces, and virtual interfaces. - BB.
CEF must be enabled before configuring the auto qos discovery command. - CC.
The auto qos privelege EXEC command must be configured on a router for several days to collect a sampling of data traffic. - DD.
The auto qos trust command relies on NBAR to provide VoIP classification. - EE.
The auto qos voip command configures the VoIP classificaiton on routers and switches.
- AA.
88When using Modular QoS CLI to classify packets arriving from a specific MAC address, which command should you use?
- AA.
Match mac - BB.
Match source - CC.
Match source-mac - DD.
Match source-address - EE.
Match source-address mac
- AA.
89Which three mechanisms are required to deploy QoS on an IP WAN? (Choose three.)
- AA.
traffic classification - BB.
Call Admission Control - CC.
queuing and scheduling - DD.
link efficiency techniques - EE.
traffic shaping - FF.
bandwidth provisioning
- AA.
90What are the three elements of configuring congestion management? (Choose three)
- AA.
queue creation - BB.
determining packet drop thresholds - CC.
determining the random early detection method - DD.
traffic classification - EE.
queue scheduling - FF.
FIFO configuration
- AA.
91Which congestion-avoidance or congestion-management technique can cause global
synchronization?- AA.
Tail drop - BB.
Random early detection - CC.
Weighted random early detection - DD.
Weighted fair queuing
- AA.
92Which policy-map action performs congestion avoidance?
- AA.
priority - BB.
bandwidth - CC.
queue-limit - DD.
random-detect
- AA.
93In the diagram shown, what mechanism needs to be employed on the remote site routers to aid
congestion avoidance in the core, based on traffic priorities?
- AA.
IP Precedence Tagging - BB.
Weighted Random Early Detection - CC.
Random Early Detection - DD.
Class Based Weighted Fair Queuing
- AA.
94Which QoS mechanism is used for congestion avoidance?
- AA.
LLQ - BB.
CBWFQ - CC.
WRED - DD.
LFI - EE.
traffic policing
- AA.
95When the typical TCP congestion avoidance process is engaged due to congestion, by what
percentage is the congestion window reduced?- AA.
12% - BB.
25% - CC.
50% - DD.
75% - EE.
100% (send zero window)
- AA.
96Which of the following are types of flow control? (Choose three.)
- AA.
buffering - BB.
cut-through - CC.
windowing - DD.
congestion avoidance - EE.
load balancing
- AA.
97QoS Low Latency Queuing is used for:
- AA.
Congestion Avoidance - BB.
Congestion Management - CC.
Traffic Shaping - DD.
Traffic Policing
- AA.
98Which statement about Control Plane Policing is true?
- AA.
Control Plane Policing allows QoS filtering to protect the control plane against DoS attacks. - BB.
Control Plane Policing classifies traffic into three categories to intercept malicious traffic. - CC.
Control Plane Policing allows ACL-based filtering to protect the control plane against DoS attacks. - DD.
Control Plane Policing intercepts and classifies all traffic.
- AA.
99Which two protocols are not protected in an edge router by using control plane policing? (Choose two.)
- AA.
SMTP - BB.
RPC - CC.
SSH - DD.
Telnet
- AA.
100Which two of these are differences between traffic policing and traffic shaping? (Choose two.)
- AA.
with traffic shaping, a router stores excess traffic in packet buffers until bandwidth is available
again - BB.
with policing you can tune the buffer usage for traffic exceeding the specified CIR - CC.
with shaping you can tune the buffer usage for traffic exceeding the specified CIR - DD.
shaping should only be applied for ingress traffic, policing only for egress - EE.
policing uses a token bucket algorithm, shaping uses an SPD algorithm
- AA.
101Which three statements are true about policing? (Choose three.)
- AA.
Out-of-profile packets are queued. - BB.
It causes TCP retransmits. - CC.
Marking and remarking are not supported. - DD.
It does not respond to BECN and foresight messages. - EE.
It uses a single- and two-bucket mechanism for metering.
- AA.
102Which of these statements correctly describes traffic policing?
- AA.
It allows for the provision of low latency on congested interfaces. - BB.
It is mandatory when enabling NBAR and CBWFQ. - CC.
It allows for the metering and limitation of bandwidth utilization. - DD.
It is also referred to as ‘buffer tuning,’ and is an optimal way to manage router I/O memory. - EE.
It should be configured on every router to avoid memory corruption.
- AA.
103Which of the following statements regarding Control Plane Policing (CoPP) is correct? (Choose
three.)- AA.
Control Plane Policing (CoPP) addresses the need to protect the management planes, ensuring
routing stability, availability, and critical packet delivery. - BB.
Control Plane Policing (CoPP) leverages MQC to define traffic classification criteria and to
specify configurable policy actions for the classified traffic. - CC.
Control Plane Policing (CoPP) uses a dedicated “control-plane” command via the Modular QoS
CLI (MQC) to provide filtering and rate limiting capabilities. - DD.
Control Plane Policing (CoPP) uses “service policy” command under relevant interfaces to filter
DOS packet to protect routing packets. - EE.
Control Plane Policing (CoPP) protects the transit management and data traffic through the
router.
- AA.
104Which option correctly identifies the point on the exhibit where Control Plane Policing (input) is
applied to incoming packets?
- AA.
point 6 - BB.
point 7 - CC.
point 4 - DD.
point 1 - EE.
points 5 and 6
- AA.
105Which two Cisco router functional planes are protected by Control Plane Policing (CoPP)? (Choose two)
- AA.
data plane - BB.
control plane - CC.
service plane - DD.
management plane - EE.
hyper plane
- AA.
106Which two statements are true about traffic shaping? (Choose two.)
- AA.
Out-of-profile packets are queued. - BB.
It causes TCP retransmits. - CC.
Marking/remarking is not supported. - DD.
It does not respond to BECN and ForeSight Messages. - EE.
It uses a single/two-bucket mechanism for metering.
- AA.
107Which statement is true about shaping?
- AA.
Shaping supports queuing of excess traffic. - BB.
Shaping can be applied both input and output on interfaces. - CC.
Shaping does not introduce delay in voice packet handling in the event of congestion. - DD.
Shaping makes instantaneous packet drop decisions.
- AA.
108Which statement about traffic policing and which statement about traffic shaping are true? (Choose two)
- AA.
Traffic policing can be applied in both the inbound and outbound direction. - BB.
Traffic policing can be apllied only in the inbound direction. - CC.
Traffic policing can be apllied only in the outbound direction. - DD.
Traffic policing can be apllied in both the inbound and outbound direction. - EE.
Traffic policing can be apllied only in the inbound direction. - FF.
Traffic policing can be apllied only in the outbound direction.
- AA.
109In which direction does traffic shaping operate?
- AA.
Inbound - BB.
Both inbound and outbound - CC.
Outbound
- AA.
110You want to apply policing and shaping functions to packets flowing into router1 over Ethernet, over a serial link to router2, and onto another Ethernet to the destination host. Which statement is most accurate when describing Cisco’s suggested design for policing and shaping?
- AA.
Shaping is applied as output on router1’s serial interface, and policing is applied on input of router2’s serial interface. - BB.
Policing is applied as output on router1’s serial interface, and shaping is applied on input of router2’s serial interface. - CC.
Shaping is applied as output on router1’s serial interface, and policing is applied on output of router2’s Ethernet interface. - DD.
Policing is applied as output on router1’s serial interface, and shaping is applied on output of router2’s Ethernet interface.
- AA.
111NBAR is used to provide which QoS function?
- AA.
classification - BB.
policing - CC.
CBWFQ bandwidth guarantees - DD.
shaping
- AA.
112How can excess packets be remarked?
- AA.
Shaping - BB.
Policing - CC.
Priority - DD.
All of the above
- AA.
113Refer to the exhibit. When applying this hierarchical policy map on the on the tunnel1 interface,
you measure high jitter for traffic going through class 1234. What is the most likely cause of this
jitter?
- AA.
The configuration of a hierarchical policy map on a tunnel interface is not supported. - BB.
Class 5555 and class 5554 are both taking up 100% of the bandwidth, leaving nothing for class
1234. - CC.
The burst size for the traffic shaping is wrongly configured to 15000; this would require an
interface capable of sending at 150Mb/s. - DD.
The burst size for the traffic shaping has been wrongly configured; it should be set as low as
possible. - EE.
The burst size for the traffic shaping has been wrongly configured; it should be set as high as
possible.
- AA.
114What is the maximum number of classes that MQC can support in a single policy map?
- AA.
512 - BB.
256 - CC.
128 - DD.
64
- AA.
115Which two protocols can have their headers compressed through MQC? (Choose two.)
- AA.
RTP - BB.
RTSP - CC.
HTTP - DD.
TCP - EE.
UDP
- AA.
116You are trying to police down to 100 Mb/s. While testing, you notice that you rarely exceed 70-80
Mb/s.
What do you need to change in your MQC configuration to allow for 100 Mb/s speeds?
- AA.
Change the CIR value from 100 Mb/s to 200 Mb/s. - BB.
Change the Bc value to allow for a large enough burst. - CC.
Change the QoS queue from default to priority. - DD.
Change the exceed-action to transmit.
- AA.
117On the Cisco IOS XR, which MQC configuration is different than on the Cisco IOS and IOS XE?
- AA.
On the Cisco IOS XR, WRED can only be applied in the output direction. - BB.
On the Cisco IOS XR, marking can only be applied in the input direction. - CC.
On the Cisco IOS XR, LLQ can be applied in the input or output direction. - DD.
On the Cisco IOS XR, LLQ can use up to four priority queues: level 1, level 2, level 3, and level 4.
- AA.
118Which three configuration components are required to implement QoS policies on Cisco routers
using MQC? (Choose three.)- AA.
class-map - BB.
global-policy - CC.
policy-map - DD.
service-policy - EE.
inspect-map
- AA.
119What happens to traffic that does not have a match when using a Modular QoS Command Line Interface (MQC)?
- AA.
It is ignored by the MQC - BB.
It is dropped (implicit deny all) - CC.
It is placed in the default class - DD.
It is process switched through the router
- AA.
120Which MQC command would you use to perform marking properly?
- AA.
precedence 5 - BB.
ip precedence 5 - CC.
set ip precedence 5 - DD.
set ip mark precedence 5 - EE.
mark ip precedence 5
- AA.
121What are two concerns when implementing CEF switching? (Choose two.)
- AA.
increased CPU utilization from maintaining the FIB table - BB.
increased memory requirement - CC.
the requirement to disable other IOS features such as NBAR and MQC - DD.
increased memory requirement on the VIP when implementing DCEF - EE.
configuration complexity - FF.
troubleshooting complexity because of the many tables that CEF maintains
- AA.
122NBAR supports all of these with the exception of which one?
- AA.
HTTP - BB.
IP multicast - CC.
TCP flows with dynamically assigned port numbers - DD.
non-UDP protocols
- AA.
123What are the differences between LLQ and CBWFQ? (Choose two.)
- AA.
LLQ priority queue bandwidth is policed with a congestion aware policer. - BB.
With LLQ, bandwidth allocations for the priority queue and all the CBWFQ queues are
configured using the priority command. - CC.
LLQ does not support WFQ on the default traffic class (class-default). - DD.
LLQ supports the addition of strict priority queuing. - EE.
LLQ is configured using MQC and CBWFQ is configured using the fair-queue command.
- AA.
124What two steps need to be taken in deploying AutoQoS for Enterprise on routers? (Choose two)
- AA.
Provide visibility into the classes of service deployed using system logging and SNMP traps. - BB.
Determine WAN setting for fragmentation, compression, encapsulation, and Frame Relay-ATM interworking. - CC.
Enable the AutoQoS VoIP for voice traffic. - DD.
Generate and deploy MQC-based QoS policies. - EE.
Profile the traffic with Auto-Discovery.
- AA.
125Which two statements are true about AutoQoS? (Choose two)
- AA.
AutoQoS has evolved over two phases: AutoQoS for SP and AutoQoS for Enterprise. - BB.
AutoQoS for Enterprise is supported on Cisco router and switch platforms. - CC.
AutoQoS is deployed on switches in two phases: Auto-Discovery and Generating MQC-based policies. - DD.
Prior to AutoQoS being configured, CEF must be enabled on the interface. - EE.
AutoQoS has evolved over two phases: AutoQoS VoIP and AutoQoS for Enterprise.
- AA.
126What is the new designation for the MPLS EXP (experimental) bits?
- AA.
QoS bits - BB.
traffic class bits - CC.
flow bits - DD.
precedence bits
- AA.
127Refer to the exhibit. For the given configuration, on packets leaving the router on interface
FastEthernet0/0 that matches the high traffic class, what will the MPLS experimental bit be set to?
- AA.
0 - BB.
1 - CC.
2 - DD.
3 - EE.
4 - FF.
5
- AA.
128Refer to the exhibit.
A PE router is configured with a policy map that contains the policer shown. The policy map is
configured in the inbound direction of an interface facing a CE router. If the PE router receives
12Mb/s of traffic with the CoS value set to 7 on a 100-Mb/s interface from the CE router, what
value of MPLS EXP is set when this traffic goes through the policer shown?
- AA.
0 - BB.
6 - CC.
7 - DD.
8
- AA.
129You work as a network engineer at Domain .com. You study the exhibit carefully. For the given configuration, on packets leaving the router on interface FastEthernet 0/0 that matches the high traffic class, what will the MPLS experimental bit be set to?
- AA.
2 - BB.
5 - CC.
3 - DD.
1 - EE.
4 - FF.
0
- AA.
130Which of the following is true about the MPLS header and its EXP field size?
- AA.
The MPLS header is 2 bytes, and the EXP field is 3 bits long. - BB.
The MPLS header is 1 byte, and the EXP field is 3 bits long. - CC.
The MPLS header is 4 bytes, and the EXP field is 3 bits long. - DD.
The MPLS header is 3 bytes, and the EXP field is 3 bits long.
- AA.
131By default, which bits are copied to the EXP bits in an MPLS label?
- AA.
DSCP - BB.
ToS - CC.
IP precedence - DD.
CoS
- AA.
132How many bits does EXP occupy in the MPLS label header?
- AA.
8 - BB.
4 - CC.
3 - DD.
1 - EE.
2
- AA.
133Which option best describes explicit routing?
- AA.
destination-based routing - BB.
link-state routing - CC.
Shortest Path First - DD.
static routes - EE.
MPLS Traffic Engineering
- AA.
134Assuming TTL propagation is enabled, how does MPLS ensure the integrity of the TTL loop
detection mechanism in IP?- AA.
The TTL field in the MPLS header is set to 255. This field is decremented at each hop in the
MPLS cloud. If
the TTL has not expired, its value is copied back into the IP header. - BB.
The TTL field in the IP header is copied to the TTL field in the MPLS header. This field is
passed
transparently through the MPLS cloud. The TTL value is copied back into the IP header. - CC.
The TTL field in the IP header is copied to the TTL field in the MPLS header. This field is
decremented by one in the MPLS cloud. If the TTL has not expired its value is copies back into the
IP header. - DD.
The TTL field in the IP header is copied to the TTL field in the MPLS header. This field is
decremented at each hop in the MPLS cloud. If the TTL has not expired, its value is copied back
into the IP header.
- AA.
135Which command will allow you to display the configured QoS group and the ingress buffer
allocated to each QoS group?- AA.
show interface priority-flow-control - BB.
show interface queuing - CC.
show queuing interface - DD.
show policy-map system type queuing - EE.
show policy-map interface ethernet <x/y> type queuing
- AA.
136Which QoS marking is only locally significant on a Cisco router?
- AA.
MPLS EXP - BB.
DSCP - CC.
QoS group - DD.
IP precedence - EE.
traffic class - FF.
flow label
- AA.
137What are two main purposes of QoS marking? (Choose two)
- AA.
To sort traffic into different service classes for QoS treatment. - BB.
To signal network devices on which QoS mechanism should be employed to meet the requirements of a particular service class. - CC.
To set fields in IP packets and identify that packet as belonging to a specific class of service. - DD.
To allow edge devices to select the QoS level on an application-by-application basis.
- AA.
138Why is it necessary to map L2 QoS marking to L3 QoS marking?
- AA.
because L2 QoS marking may not cross the network end to end - BB.
because L2 QoS markings such as CoS are only local to the router or switch - CC.
because L2 QoS marking can only identify up to 8 traffic classes - DD.
because routers do not support L2 QoS marjings - EE.
because L2 Qos marking cannot be trusted
- AA.
139Which three QoS markers can be set using class-based marking? (Choose three.)
- AA.
discard-threshold - BB.
qos-group - CC.
mpls exp bits - DD.
cos - EE.
becn - FF.
fecn
- AA.
140Which QoS tool is defined as “marking a packet or flow with a specific priority”?
- AA.
Queuing - BB.
Scheduling - CC.
Classification - DD.
Network provision
- AA.
141Which two statements are true about NBAR? (Choose two.)
- AA.
NBAR performs protocol discovery. - BB.
NBAR is not dependent on CEF. - CC.
NBAR is used for traffic statistics collection. - DD.
NBAR performs traffic classification.
- AA.
142What is the purpose of the NBAR discovery protocol?
- AA.
to build a Packet Description Language Module (PDLM) file to be used in protocol matching - BB.
to discover applications and build class maps for data classification - CC.
to look into the TCP or UDP payload and classify packets based on the content - DD.
to build a database of all application data that passes through the router and queue the data accordingly
- AA.
143Which command would add a new Packet Description Language Module (PDLM) called citrix.pdlm to the list of protocols that would be recognized by network-based application recognition (NBAR)?
- AA.
RTA# ip nbar pdlm - BB.
RTA# ip nbar pdlm flash://citrix.pdlm - CC.
RTA(config)# ip nbar pdlm - DD.
RTA(config)# ip nbar pdlm flash://citrix.pdlm - EE.
RTA(config-if)# ip nbar pdlm - FF.
RTA(config-if)# ip nbar pdlm flash://citrix.pdlm
- AA.
144What are the steps for configuring stateful NBAR for dynamic protocols?
- AA.
Use the command ip nbar protocol-discovery to allow identification of stateful protocols. Use the command ip nbar port-map to attach the protocols to an interface. - BB.
Use the command match protocol rtp to allow identification of real-time audio and video traffic. Use the command ip nbar port-map to extend the NBAR functionality for well-known protocols to new port numbers. - CC.
Use the comand match protocol to allow identification of stateful protocols. Use the command ip nbar port-map to attach the protocols to an interface. - DD.
Configure a traffic class. Configure a traffic policy. Attach the traffic policy to an interface. - EE.
Configure video streaming. Configure audio streaming. Attach the codec to an interface.
- AA.
145Which three statementes about the NBAR protocol are true? (Choose three)
- AA.
NBAR can be used to classify output traffic on a WAN link where tunnelig or encryption is used. - BB.
NBAR classifies HTTP traffic by text within the URL. - CC.
NBAR is used by IntServ as a classification and protocol discovery feature. - DD.
NBAR is supported on logical interfaces such as Fast EtherChannel. - EE.
NBAR performs identification of Layer 4 through Layer 7 applications and protocols. - FF.
Packet Description Languages Modules (PDLMs) allow NBAR to recognize new protocols without requirin a new Cisco IOS image or a router reload.
- AA.
146What is supported by the network-based application recognition (NBAR) feature?
- AA.
more than 24 concurrent URLs, hosts, or MIME-type matches - BB.
matching beyond the first 400 bytes in a packet payload - CC.
multicast and switching modes other than Cisco Express Forwarding (CEF) - DD.
fragmented packets - EE.
subport classification
- AA.
147Refer to the exhibit. Which show command would be used to display NBAR classified traffic on interface FastEthernet0/1?
- AA.
show policy-map int fa 0/1 - BB.
show int fa 0/1 policy-map - CC.
show ip nbar protocol-discovery - DD.
show int fa 0/1 nbar
- AA.
148Based on the displayed network diagram and configuration. You are hosting a web server at 10.1.1.90, which is under a denial of service attack. Use NBAR to limit web traffic to that server at 200 kb/s. Which configuration is true to complete the NBAR configuration?
- AA.
policy-map DoS-Attack
class DoS
police cir 200 bc 200 be 200
conform-action transmit
exceed-action drop
violate-action drop
!
access-list 188 permit tcp any host 10.1.1.90 eq www - BB.
policy-map drop
class DoS
police conform-action transmit exceed-action drop - CC.
policy-map drop
class DoS
police cir 200000 bc 37500 be 75000
conform-action transmit
exceed-action drop
violate-action drop
!
access-list 188 permit tcp any host 10.1.1.90 eq www - DD.
policy-map DoS-Attack
class DoS
police cir 200000 bc 37500 be 75000
conform-action transmit
exceed-action drop
violate-action drop
!
access-list 188 permit tcp any host 10.1.1.90 eq www
- AA.
149Which element is mandatory for QoS policy propagation through BGP operations? (Exhibit)
- AA.
MPLS - BB.
NBAR - CC.
CEF - DD.
QoS pre-classify - EE.
policy-based routing - FF.
MQC
- AA.
150QoS policy propagation through BGP (QPPB) supports which two QoS markers? (Choose two.)
- AA.
DSCP - BB.
IP precedence - CC.
QoS group - DD.
COS - EE.
MPLS EXP
- AA.
151QPPB is an acronym for QoS Policy Propogation via BGP. QPPB allows which of these marking behaviors?
- AA.
The assigning of only a BGP specific community attribute based on the ingress packet DSCP marking. - BB.
The assigning of only a BGP specific attribute based on the IP precedence and DSCP of ingress packet. - CC.
QPPB provides no marking or classification behaviors. - DD.
The use of NBAR to associate an IP Precedence to a packet.
- AA.
152On Cisco routers, how is hierarchical QoS implemented?
- AA.
Within the parent policy, reference another child policy using the policy-map command. - BB.
Within the child policy, reference another parent policy using the policy-map command. - CC.
Use the policy-map command within a service-policy to implement nested policy-maps. - DD.
Within the parent policy-map, reference another child policy-map using the service-policy
command.
- AA.
153What is the default queuing mechanism on slow serial interfaces?
- AA.
FIFO - BB.
WFQ - CC.
CQ - DD.
LLQ - EE.
WRR
- AA.
154Modified deficit round robin supports which of these functionalities?
- AA.
Priority queue - BB.
Weighted fair queues - CC.
Round-robin service of output queues - DD.
LLQ
- AA.
155What types of queues does PQ utilize?
- AA.
first-in, first-out - BB.
weighted round robin based on assigned bandwidth - CC.
strict priority based on assigned priority - DD.
last-in, first-out - EE.
weighted round robin based on assigned priority
- AA.
156Which two statements best describe CBWFQ? (Choose two.)
- AA.
The CBWFQ scheduler provides a guaranteed minimum amount of bandwidth to each class. - BB.
CBWFQ services each class queue using a strict priority scheduler. - CC.
The class-default queue only supports WFQ. - DD.
Inside a class queue, processing is always FIFO, except for the class-default queue.
- AA.
157How many classes does CBWFQ support?
- AA.
128 - BB.
16 - CC.
64 - DD.
4 - EE.
32
- AA.
158How is CBWFQ configured?
- AA.
By using the bandwidth command in interface configuration mode - BB.
By using a bandwidth statement within a policy map - CC.
By using the random- detect command in interface configuration mode - DD.
By using the fair- queue command in interface configuration mode - EE.
It is the default queuing mechanism on interfaces slower than 2Mbps
- AA.
159Which command can be used to change the amount of bandwidth which can be reserved for CBWFQ or LLQ?
- AA.
bandwidth - BB.
fair- queue - CC.
qos bandwidth - DD.
max- reserved- bandwidth - EE.
max- reservable- bandwidth
- AA.
160You are using class-based weighted fair queuing (CBWFQ) to manage queues in your network. Voice quality has been inconsistent over lower speed WAN links and users have been complaining. You have decided to configure low latency queuing (LLQ) on the lower speed links to help improve voice quality in the network.
Which three of the following steps should you take to implement LLQ in the network? (Choose three)- AA.
Ensure voice traffic is marked with avalue EF in the DSCP. - BB.
Assign voice traffic control protocol traffic to its own queue with a DSCP value of AF31. - CC.
Assign all voice traffic to the priority queue in LLQ. - DD.
Assign all non time-sensitive,nonvoicetraffic to a default queue with a DSCP value of 0. - EE.
Ensure voice traffic is given a minimum of 20% of available bandwidth through policing. - FF.
Ensure that allnonvoicetraffic does not exceed more than 75% of available bandwidth.
- AA.
161Which command is used within a policy map to specify LLQ for a traffic class?
- AA.
priority - BB.
llq- priority - CC.
llq - DD.
low- latency - EE.
ip rtp priority
- AA.
162Which three protocols or applications should be placed in a class that is configured with WRED?
(Choose three.)- AA.
HTTP - BB.
RTP - CC.
streaming video - DD.
BitTorrent - EE.
POP3
- AA.
163Which of the following is true about WRED?
- AA.
WRED cannot be applied to the same interface as CQ, PQ, and WFQ. - BB.
WRED drops packets from all flows. - CC.
WRED cannot mark with a probability denominator. - DD.
WRED cannot be applied to the voice queue.
- AA.
164When configuring class-based WRED on Cisco routers, which WRED parameter is not user
configurable on a Cisco IOS XR but is user configurable on a Cisco IOS and IOS XE?- AA.
the ingress or egress direction where the class-based WRED policy will be applied - BB.
the maximum threshold - CC.
the minimum threshold - DD.
the mark probability denominator
- AA.
165Which of the following describe flow- based WRED?
- AA.
Only available on VIP- based 7500 series and 12000 GSRs - BB.
Cannot be enabled on an interface which is already running WFQ, PQ, or CQ - CC.
Distinguishes adaptable flows from non- adaptable flows - DD.
Prevents a single flow from monopolizing an interface - EE.
Can work on an interface along with WFQ, PQ, or CQ
- AA.
166What does WRED use to determine the drop probability of a packet?
- AA.
DSCP - BB.
Destination address - CC.
IP Precedence - DD.
Length - EE.
rate- limit parameters
- AA.
167267) Which three conditions can occur when metering traffic using a dual token bucket traffic policing
QoS mechanism on Cisco routers? (Choose three.)- AA.
conform - BB.
pass - CC.
violate - DD.
exceed - EE.
burst - FF.
matched
- AA.
168How many token buckets are needed to support a multi-actions policer that meters conforming,
exceeding and violating traffic?- AA.
1 - BB.
3 - CC.
5 - DD.
2 - EE.
6 - FF.
4
- AA.
169Which three traffic conditions can be matched when configuring single rate, dual token bucket
traffic policing on Cisco routers? (Choose three.)- AA.
conform - BB.
normal - CC.
violate - DD.
peak - EE.
exceed - FF.
average
- AA.
170Based on this configuration, what type of marker is achieved?
- AA.
Single-rate, two-color marker V - BB.
Three-rate, two-color marker - CC.
Two-rate, three-color marker - DD.
Single-rate, three-color marker
- AA.
171What are three foundations of traditional IP routing? (Choose three.) (Source:
Introducing MPLS)- AA) Routing protocols are used on all devices to distribute routing information.
- BB) Regardless of protocol, routers always forward packets based on only the IP
destination address (except for using PBR). - CC) Routing lookups are performed on every router.
- DD) Routing is performed by assigning a label to an IP destination.
- EE) Routing lookup is performed only at the first router on the path.
172Which three statements about MPLS are true? (Choose three.) (Source: Introducing
MPLS)- AA) MPLS uses labels to forward packets.
- BB) MPLS works only in IP networks.
- CC) MPLS labels can correspond to a Layer 3 destination address, QoS, source
address, or Layer 2 circuit. - DD) MPLS does not require a routing table lookup on core routers.
- EE) MPLS performs routing lookup on every router.
173The MPLS label field consists of how many bits? (Source: Introducing MPLS)
- AA) 64 bits
- BB) 32 bits
- CC) 16 bits
- DD) 8 bits
174Which two statements about LSRs are true? (Choose two.) (Source: Introducing
MPLS)- AA) An edge LSR is a device that inserts labels on packets or removes labels and
forwards packets based on labels. - BB) An LSR is a device that primarily labels packets or removes labels.
- CC) An LSR is a device that forwards packets based on labels.
- DD) An end LSR is a device that primarily inserts labels on packets or removes
labels.
- AA) An edge LSR is a device that inserts labels on packets or removes labels and
175Which two statements about RSVP are true? (Choose two.) (Source: Introducing
MPLS)- ARSVP is used to create an LSP tunnel.
- BRSVP propagates labels for TE tunnels.
- CRSVP assigns labels for TE tunnels.
- DRSVP is not used to create an LSP tunnel.
176In MPLS VPN networks, which statement is true? (Source: Introducing MPLS)
- AA) Labels are propagated via LDP or TDP.
- BB) Next-hop addresses, instead of labels, are used in an MPLS VPN network.
- CC) Labels are propagated via MP-BGP.
- DD) Two labels are used; the top label identifies the VPN, and the bottom label
identifies the egress router.
177Which two statements about interactions between MPLS applications are true? (Choose
two.) (Source: Introducing MPLS)- AA) The forwarding plane is the same for all applications.
- BB) Differences exist in the forwarding plane depending on the MPLS application.
- CC) The control plane is the same for all applications.
- DD) Differences exist in the control plane depending on the MPLS application.
178What does per-platform label space require? (Source: Label Distribution Protocol)
- AA) It requires only one LDP session.
- BB) It requires one session per interface.
- CC) It requires multiple sessions for parallel links.
- DD) “Per-platform” is not a proper term in MPLS terminology.
179 LDP uses which two well-known port numbers? (Choose two.) (Source: Label
Distribution Protocol)- AA) 464
- BB) 646
- CC) 711
- DD) 171
180Which three pieces of information are contained in the LFIB? (Choose three.) (Source:
Label Distribution Protocol)- AA) local generated label
- BB) outgoing label
- CC) local address
- DD) next-hop address
- EE) destination IP network
181When an IP packet is to be label-switched as it traverses an MPLS network, which
table is used to perform the label switching? (Source: Label Distribution Protocol)- AA) LIB
- BB) FIB
- CC) FLIB
- DD) LFIB
182Which statement is correct? (Source: Label Distribution Protocol)
- AA) An IP forwarding table resides on the data plane; LDP runs on the control
plane; and an IP routing table resides on the data plane. - BB) An IP forwarding table resides on the data plane; LDP runs on the control
plane; and an IP routing table resides on the control plane. - CC) An IP forwarding table resides on the control plane; LDP runs on the control
plane; and an IP routing table resides on the data plane. - DD) An IP forwarding table resides on the control plane; LDP runs on the control
plane; and an IP routing table resides on the control plane.
- AA) An IP forwarding table resides on the data plane; LDP runs on the control
183Which two tables contain label information? (Choose two.) (Source: Label Distribution
Protocol)- AA) LIB
- BB) main IP routing table
- CC) FLIB
- DD) LFIB
184Which two statements about LSPs are correct? (Choose two.) (Source: Label
Distribution Protocol)- AA) LSPs are bidirectional.
- BB) LSPs are unidirectional.
- CC) LDP advertises labels for the entire LSP.
- DD) LDP advertises labels only for individual segments in the LSP.
185Which statement about TTL propagation being disabled is correct? (Source: Label
Distribution Protocol)- AA) The label TTL is copied back into the IP TTL.
- BB) The IP TTL is copied back into the TTL of the label.
- CC) The IP TL is not copied back into the TTL of the label.
- DD) TTL label propagation can not be disabled.
186Upon a link failure, which three tables are updated to reflect the failed link? (Choose
three.) (Source: Label Distribution Protocol)- AA) LIB
- BB) LFIB
- CC) FIB
- DD) FLIB
- EE) BIL
187Which statement correctly describes how a link failure is handled in an MPLS
network? (Source: Label Distribution Protocol)- AA) Overall convergence depends on LDP.
- BB) Overall convergence depends on the IGP that is used.
- CC) Upon a link failure, only LDP convergence is affected.
- DD) Upon a link failure, only the IGP convergence is affected.
188Upon a link recovery, which three tables are updated to reflect the failed link? (Choose
three.) (Source: Label Distribution Protocol)- AA) LFIB
- BB) FLIB
- CC) FIB
- DD) LIB
- EE) BIL
189Which statement correctly describes convergence in MPLS network after a link failure
has occurred and been restored? (Source: Label Distribution Protocol)- AA) MPLS convergence occurs after IGP convergence.
- BB) MPLS convergence occurs before IGP convergence peer to peer.
- CC) If a failure occurs with the IGP, MPLS convergence is not affected.
- DD) If a failure occurs with the IGP, MPLS will not be able to converge after the
IGP failure has been corrected unless the MPLS process is bounced.
190What is another name for topology-driven switching? (Source: Label Distribution
Protocol)- AA) Cisco Express Forwarding
- BB) fast switching
- CC) cache switching
- DD) process switching
191If IP TTL propagation is not allowed, what is the value that is placed in the MPLS
header? (Source: Implementing MPLS in the Service Provider Core)- AA) 0
- BB) 1
- CC) 254
- DD) 255
192What needs to be configured to specify which neighbors would selectively receive
label advertisements? (Source: Implementing MPLS in the Service Provider Core)- AA) Controlled label distribution needs to be configured.
- BB) Conditional label distribution needs to be configured.
- CC) Unsolicited label distribution needs to be configured.
- DD) No configuration is necessary; all neighbors will receive all labels.
193Which command is used to display the contents of the LIB table? (Source:
Implementing MPLS in the Service Provider Core)- AA) show mpls ldp labels
- BB) show mpls ldp bindings
- CC) show mpls ldp neighbors
- DD) show mpls forwarding-table
194Which is the correct command to enable MPLS in Cisco IOS Software? (Source:
Implementing MPLS in the Service Provider Core)- AA) Router(config)#ip mpls
- BB) Router(config-if)#ip mpls
- CC) Router(config)#mpls ip
- DD) Router(config-if)#mpls ip
195Which two situations can result in network congestion? (Choose two.) (Source:
Introducing MPLS Traffic Engineering Components)- AA) The least-cost network path is being used to route traffic.
- BB) Traffic streams are efficiently mapped onto available resources.
- CC) Network resources are insufficient to accommodate the offered load.
- DD) Traffic streams are inefficiently mapped onto available resources.
196When you are using TE with a Layer 2 overlay model, which two options transport
traffic across a network? (Choose two.) (Source: Introducing MPLS Traffic Engineering
Components)- AA) DVCs
- BB) PVCs
- CC) RVCs
- DD) SVCs
197When you are using a traffic-engineered Layer 3 model, which two of the following are
limitations? (Choose two.) (Source: Introducing MPLS Traffic Engineering
Components)- AA) using static routes
- BB) using policy routing
- CC) unavailability of explicit routing
- DD) path computation that is based on just the IGP metric
198Which two options can be used to advertise a traffic tunnel so that it will appear in the IP
routing table? (Choose two.) (Source: Introducing MPLS Traffic Engineering
Components)- AA) the autoroute feature
- BB) a TE mapping statement
- CC) static routes
- DD) the mpls traffic-eng tunnels command
199What is the role of RSVP in an MPLS TE implementation? (Source: Introducing MPLS
Traffic Engineering Components)- AA) It identifies the best path for the tunnel.
- BB) It reserves the bandwidth that is required by the tunnel.
- CC) It performs the CBR calculations for the tunnel setup.
- DD) It assigns the label for the MPLS LSP.
200Which three options affect how a path is set up? (Choose three.) (Source: Introducing
MPLS Traffic Engineering Components)- AA) priority
- BB) bandwidth
- CC) affinity attributes
- DD) MPLS label stack
- EE) MPLS EXP bit
Informações
- Descrição
- Quiz sobre Test 2, criado por paperina peper em 05-08-2016.
- Autor
- paperina peper
- Idioma
- English
- Visualizações
- 18
- Avaliação
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