Test
Test 3
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Preguntas del test (113)
1Which statement is correct concerning the RSVP sessions in an MPLS-TE application?
- AA) The sessions are run between the routers at the tunnel endpoints.
- BB) The sessions are run between hosts.
- CC) Two set of sessions are run, one between the hosts and their tunnel end routers, and
another between the tunnel end routers.
2During path reoptimization, which router first attempts to identify a better LSP?
- AA) the headend router
- BB) any router that has identified that it has new resources available
- CC) the tunnel end router
3Which option solves the problem of setting up two tunnels and having the resources
counted twice?- AA) path reuse
- BB) path monitoring
- CC) path rerouting
- DD) path reoptimization
4Which method is used to calculate the LSP?
- AA) CBR
- BB) DUAL algorithm
- CC) SPF algorithm
- DD) no calculation used
5Do statically configured destinations list their tunnels in the routing table?
- AA) Yes, they are listed as incoming interfaces.
- BB) Yes, they are listed as loopback interfaces.
- CC) Yes, they are listed as outgoing interfaces.
- DD) No, statically configured tunnels are not listed in the routing table.
6Do statically configured destinations list their tunnels in the routing table?
- AA) The IGP path will be used.
- BB) The LSP path will be used.
- CC) Both paths will be used, and load balancing will be implemented.
- DD) It is not possible to answer from the information that has been provided.
7Which option is not a component of the maximum allocation multiplier attribute?
- AA) maximum bandwidth
- BB) unreserved bandwidth
- CC) minimum available bandwidth
- DD) maximum reservable bandwidth
8Which two options about the tunnel resource class affinity mask are true? (Choose two.)
- AA) If bit is 0, do care.
- BB) If bit is 1, do care.
- CC) If bit is 0, do not care.
- DD) If bit is 1, do not care.
9Which two protocols can be used to propagate MPLS-TE link attributes? (Choose two.)
- AA) BGP
- BB) OSPF
- CC) EIGRP
- DD) IS-IS
10In the case of a tie after CBR has been run, which two values are used to break the tie?
(Choose two.)- AA) larger hop count
- BB) smallest hop count
- CC) highest minimum bandwidth
- DD) highest maximum bandwidth
11Which command enables MPLS-TE in an OSPF implementation on a Cisco IOS
Software device?- AA) mpls-te enable
- BB) mpls traffic-eng
- CC) metric-style wide
- DD) mpls traffic-eng area
12With the autoroute feature enabled, the traffic tunnel can do which two things? (Choose
two.)- AA) appear in the routing table
- BB) have an associated IP metric
- CC) be used in link-state updates
- DD) allow the rest of the network to be aware of the traffic tunnel
13How much one-way delay can a voice packet tolerate?
- AA) 15 ms
- BB) 150 ms
- CC) 300 ms
- DD) 200 ms
14Which three options are advantages of using MQC? (Choose three.)
- AA) reduction in time to configure a complex policy
- BB) ability to apply one policy to multiple interfaces
- CC) separation of classification from policy definition
- DD) automatic generation of CLI commands from MQC macros
15How many bits constitute the DSCP field of the IP header?
- AA) 3
- BB) 4
- CC) 6
- DD) 8
16Which QoS mechanism is used on both input and output interfaces?
- AA) classification
- BB) traffic policing
- CC) traffic shaping
- DD) congestion management
17The QoS requirements on the CE and PE routers differ depending on which factor?
- AA) whether the PE router is managed by the service provider
- BB) whether the CE router is managed by the service provider
- CC) whether the service provider is using an MPLS core
- DD) the number of traffic classes that are supported by the service provider
18Which option is a Layer 2 QoS marking?
- AA) CoS
- BB) DSCP
- CC) EXP
- DD) QoS group
19Which option is a congestion-avoidance mechanism?
- AA) LFI
- BB) QPM
- CC) MRF
- DD) WRED
20Which two QoS mechanisms are used in the service provider core on P routers?
(Choose two.)- AA) policing
- BB) marking
- CC) queuing
- DD) dropping
21Which command is used to display the statistics of applied QoS policy on an interface?
- Ashow policy-map interface interface_number
- Bshow policy-map shared-policy-instance
- Cshow policy-map list
- Dshow policy-map
22What is the Cisco QoS baseline marking recommendation for call signaling traffic?
- AA) AF31
- BB) EF
- CC) CS3
- DD) BE
23In which location should the administrator enforce the trust boundary?
- AA) at the core of the network
- BB) as close as possible to the source of traffic flow
- CC) as close as possible to the destination of traffic flow
- DD) always at endpoint devices
24Which two options are internal markings? (Choose two.)
- AA) DE bit
- BB) QoS group
- CC) source MAC address
- DD) Discard Class
25CoS markings are contained in which two of the following headers? (Choose two.)
- AA) IP header
- BB) Frame Relay header
- CC) ISL header
- DD) 802.1Q header
- EE) MPLS header
26Which Cisco IOS command is used for traffic classification using NBAR?
- AA) match access-group name name
- BB) ip nbar protocol-discovery
- CC) ip nbar pldm pldm_file
- DD) match protocol protocol_name
27In which two locations can the qos pre-classify command be applied for IPSec/GRE
tunnels? (Choose two.)- AA) class map
- BB) crypto map
- CC) tunnel interface
- DD) physical interface
28Which statement about the ToS byte is true when IPSec or GRE tunnels are used?
- AA) To copy the ToS byte from original to tunneled packet header, the QoS
preclassify feature must be used. - BB) The ToS byte is automatically copied from the original to the tunneled packet
header by the tunneling mechanism. - CC) The ToS byte is automatically copied from the tunnel to the original IP packet
header only for incoming packets. - DD) None of the above is true.
- AA) To copy the ToS byte from original to tunneled packet header, the QoS
29Which Cisco IOS interface mode command enables bidirectional, per-interface
protocol statistics?- AIp nbar protocol-discovery
- Bip nbar pldm
- Cmatch protocol http
- Dip nbar custom
30What has to be configured as a prerequisite before you configure NBAR to recognize
HTTP requests?- AA) routing protocol
- BB) MPLS
- CC) IP Cisco Express Forwarding
- DD) IP HTTP server
31Which two markers does the QPPB feature support? (Choose two.)
- AA) IP precedence
- BB) CoS
- CC) MPLS EXP
- DD) QoS group
32Which option can be used to specify QoS behavior at multiple policy levels?
- AA) route maps or RPL
- BB) AutoQoS
- CC) hierarchical QoS
- DD) QoS CLI
33What happens when the highest-priority queue becomes congested in a priority queuing
algorithm?- AA) All the other queues starve.
- BB) Tail dropping focuses on the highest-priority queue.
- CC) Other queues are served on a round-robin basis.
- DD) Packets in the highest-priority queue are moved to a lower-priority queue.
34If the hardware queue is not full, how will the next packet be serviced by the software
queue?- AA) software queue will be bypassed
- BB) software queue will enqueue the packet
- CC) software queue will expedite the packet
- DD) software queue will only meter the packet
35How does WFQ implement tail dropping?
- AA) drops the last packet to arrive
- BB) drops all nonvoice packets first
- CC) drops the lowest-priority packets first
- DD) drops packets from the most aggressive flows
36Which option is the default dropping scheme for CBWFQ?
- AA) RED
- BB) WRED
- CC) tail drop
- DD) class-based policing
37What does LLQ bring to CBWFQ?
- AA) strict priority scheduling
- BB) alternate priority scheduling
- CC) nonpoliced queues for low-latency traffic
- DD) special voice traffic classification and dispatch
38Which type of traffic should you limit the use of the priority command to?
- AA) critical data traffic
- BB) voice traffic
- CC) bursty traffic
- DD) video and teleconferencing ABR traffic
39What are two ways in which TCP manages congestion? (Choose two.)
- AA) TCP uses tail drop on queues that have reached their queue limit.
- BB) TCP uses dropped packets as an indication that congestion has occurred.
- CC) TCP uses variable window sizes to reduce and increase the rates at which
packets are sent. - DD) TCP measures the average size of device queues and drops packets, linearly
increasing the amount of dropped packets with the size of the queue.
40Two stations (A and B) are communicating using TCP. Station A has negotiated a TCP
window size of 5, and sends five packets to station B. Station A receives three ACK
messages from station B indicating ACK 3.
Which two options best describe the status of the communication between A and B?
(Choose two.)- AA) Station B is acknowledging receipt of packets 1, 2, and 3, but has lost packets 4
and 5. - BB) Station A initiates a fast retransmit and immediately sends packet 3 to B.
- CC) Station B has not received packet 3.
- DD) Station B has received packets 1, 2, and 3, but not packet 4. It cannot be
determined where packet 5 was received at B until packet 4 has been sent. - EE) Station A will send packets 4 and 5 to station B upon receipt of the station B
ACK.
- AA) Station B is acknowledging receipt of packets 1, 2, and 3, but has lost packets 4
41What are three important limitations of using a tail-drop mechanism to manage queue
congestion? (Choose three.)- AA) Tail drop can cause many flows to synchronize, lowering overall link
utilization. - BB) Tail drop can cause starvation of fragile flows.
- CC) Tail drop increases the amount of packet buffer memory required, because
queues must be full before congestion management becomes active. - DD) Tail drop results in variable delays, which can interfere with delay-sensitive
traffic flows.
- AA) Tail drop can cause many flows to synchronize, lowering overall link
42What are three advantages of active congestion management using RED? (Choose
three.)- AA) RED uses selective packet discard to eliminate global synchronization of
TCP flows. - BB) RED avoids congestion by ensuring that interface queues never become full.
- CC) RED increases the overall utilization of links.
- DD) RED uses selective packet discard to penalize aggressive flows.
- AA) RED uses selective packet discard to eliminate global synchronization of
43What are the three traffic drop modes in RED? (Choose three.)
- AA) no drop
- BB) full drop
- CC) random drop
- DD) deferred drop
44Is RED enabled by default in Cisco IOS XR Software?
- AA) yes
- BB) no
45Which option describes a major difference between traffic policing versus traffic
shaping?- AA) Traffic policing drops excess traffic, while traffic shaping delays excess traffic
by queuing it. - BB) Traffic policing is applied only in the outbound direction, while traffic shaping
can be applied in both the inbound and outbound directions. - CC) Traffic policing is not available on access switches such as the Cisco ME 3400
Series, while traffic shaping is available on such devices. - DD) Traffic policing requires policing queues to buffer excess traffic, while traffic
shaping does not require any queues to buffer excess traffic.
- AA) Traffic policing drops excess traffic, while traffic shaping delays excess traffic
46Which mathematical model is used by traffic policing mechanisms to meter traffic?
- AA) token bucket
- BB) RED
- CC) FIFO metering
- DD) Predictor or Stacker
47When configuring single-rate class-based policing, which configuration parameter is
used to enable a dual token bucket?- AA) configuring a violate action
- BB) configuring an exceed action
- CC) configuring the PIR in addition to the CIR
- DD) configuring Be
48What is the main advantage of using multiaction policing?
- AA) to distinguish between exceeding and violating traffic
- BB) to distinguish between conforming and exceeding traffic
- CC) to allow the setting of Layer 2 and Layer 3 QoS markers at the same time
- DD) to allow marking of the traffic before transmission
49You must enable LPTS hardware policing to protect the router.
- AA) true
- BB) false
50Which two statements are true when class-based shaping is used in conjunction with
CBWFQ? (Choose two.)- AA) The bandwidth command defines the minimum guaranteed bandwidth for the
traffic class. - BB) The bandwidth command defines the maximum guaranteed bandwidth for the
traffic class. - CC) A child class can use all parent bandwidth if there is no congestion.
- DD) A child class can use only the dedicated bandwidth.
- AA) The bandwidth command defines the minimum guaranteed bandwidth for the
51What are two configuration options when configuring class-based traffic shaping on
Cisco IOS XR Software? (Choose two.)- AA) excess burst
- BB) single or dual token bucket
- CC) shape average
- DD) single or multiaction traffic shaping
- EE) single- or dual-rate traffic shaping
52Which two are the proper syntax for enabling MPLS on an interface? (Choose two)
- AA.
router(config-if)# mpls ip - BB.
router(config-if)# mpls enable - CC.
router(config-if)# tag-switching - DD.
router(config-if)# tag-switching ip - EE.
router(config)# tag-switching int s0/0
- AA.
53Which three statements are true when is used Uniform Mode DiffServ? (Choose Three.)
- AThe EXP value is changed in the provider core.
- BAt the egress PE, the subscriber DSCP or ToS field values are altered.
- CThe subscriber will need to reset the original value on the customer edge
(CE) device. - DThe provider uses its own EXP values, including an egress PE-CE link, but
does not alter subscriber DSCP or ToS values. - ESubscribers receive traffic with their original DSCP or ToS marked value.
- FThe provider changes the EXP values in the core, but honors the subscriber
DSCP or ToS values on the egress PE-CE link. - GSubscribers receive traffic that is marked with the original DSCP or ToS value.
54Which two statements are true when is used Pipe Mode DiffServ? (Choose Two.)
- AThe provider uses its own EXP values, including an egress PE-CE link, but does not alter subscriber DSCP or ToS values.
- BSubscribers receive traffic with their original DSCP or ToS marked value.
- CThe EXP value is changed in the provider core.
- DAt the egress PE, the subscriber DSCP or ToS field values are altered.
- EThe subscriber will need to reset the original value on the customer edge (CE) device.
- FThe provider changes the EXP values in the core, but honors the subscriber DSCP or ToS values on the egress PE-CE link.
- GSubscribers receive traffic that is marked with the original DSCP or ToS value.
55Which two statements are true when is used Short-Pipe Mode DiffServ? (Choose Two.)
- AThe provider changes the EXP values in the core, but honors the subscriber DSCP or ToS values on the egress PE-CE link.
- BSubscribers receive traffic that is marked with the original DSCP or ToS value.
- CSubscribers receive traffic with their original DSCP or ToS marked value.
- DThe provider uses its own EXP values, including an egress PE-CE link, but does not alter subscriber DSCP or ToS values.
- EThe subscriber will need to reset the original value on the customer edge (CE) device.
- FAt the egress PE, the subscriber DSCP or ToS field values are altered.
- GThe EXP value is changed in the provider core.
56Which four statements are true when is used Short-Pipe Mode DiffServ? (Choose four.)
- AThe customer and service provider are in different DiffServ domains.
- BThe service provider enforces its own DiffServ policy.
- CThe service provider maintains DiffServ transparency.
- DOn PE egress, the customer QoS policy is implied.
- EOn PE egress, the service provider QoS policy is implied.
- FThe customer and service provider share the same DiffServ domain.
- GThe customer IP precedence or DSCP is copied into the MPLS EXP field on ingress.
- HThe MPLS EXP bits are propagated down into the IP Precedence or DSCP field on egress.
57WRED profile selection on Cisco XR have additional profile. Choose the three correct profile.
- AMPLS EXP (8 profiles)
- BDiscard eligibility indicator (2 profiles)
- CCoS (8 profiles)
- DIP precedence (8 profiles)
- EDSCP (64 profiles)
- FDiscard class (8 profiles)
58Which three statements are true when is used Shaping to average rate? (Choose Three.)
- AForwarding at the configured average rate
- BAllowed bursting up to Be when there are extra tokens available
- CMost common method
- DSupported on Cisco IOS XR, Cisco IOS, and Cisco IOS XE routers
- ESupported on Cisco IOS and Cisco IOS XE routers
- FForwarding at the peak rate of up to Bc + Be at every Tc
- GRarely used
- HNot supported on Cisco IOS XR Software
59Which three statements are true when is used Shaping to peak rate? (Choose Three.)
- AForwarding at the peak rate of up to Bc + Be at every Tc
- BRarely used
- CNot supported on Cisco IOS XR Software
- DSupported on Cisco IOS XR, Cisco IOS, and Cisco IOS XE routers
- ESupported on Cisco IOS XR Software
- FMost common method
- GAllowed bursting up to Be when there are extra tokens available
- HForwarding at the configured average rate
60Which Weights can be defined when is used CBWFQ? (Choose four)
- ABandwidth (in Kb/s,Mb/s,Gb/s)
- BPercentage of bandwidth
- CPercentage of remaining available bandwidth
- DOne service policy cannot have mixed types of weights.
- EHigh-priority classes are guaranteed
- FNot limited to UDP ports as with IP RTP priority
- GDefines trust boundary to ensure simple classification and entry to aqueue
61Which statements are necessary on LPTS for software security. (Choose two)
- Aport arbitrator
- Bflow managers
- CDRPs
- Dnonstop routing
62Which stage S1 are use on XR forwarding? (self-routed architecture)
- AS1:is connected to the ingress line card, and delivers the cells across all stage 2 fabric cards.
- BS1:supports multicast replication, and delivers the cells to the appropriate stage 3 fabric cards associated with the egress line card shelf.
- CS1:Responsible for packet lookup and packet processing
- DS1:is connected to the egress line card for delivery to the appropriate interface and subinterface.
63Which stage S2 are use on XR forwarding? (non-blocking switching)
- AS2:supports multicast replication, and delivers the cells to the appropriate stage 3 fabric cards associated with the egress line card shelf.
- BS2:is connected to the ingress line card, and delivers the cells across all stage 2 fabric cards.
- CS2:Provides the communication path between the line cards.
- DS2:is connected to the egress line card for delivery to the appropriate interface and subinterface.
64Which two advantages with traditional ISPs? (Choose Two.)
- AEmployed one technology–IP (cost-effective)
- BHad competitive pricing
- CHad no VPNs
- DUsed good QoS mechanisms
- EOffered Internet access, VPNs, and telephony
65Which two limitations with traditional ISPs? (Choose Two.)
- AEmployed one technology–IP (cost-effective)
- BHad competitive pricing
- CProvided only Internet access
- DHad no VPNs
- EProvided costly services
- FEmployed multiple technologies (costly)
66Which two limitations with traditional Telcos? (Choose Two.)
- AProvided costly services
- BEmployed multiple technologies (costly)
- CHad no VPNs
- DProvided only Internet access
- EHad competitive pricing
67Which three advantages with traditional Telcos? (Choose Three.)
- AEmployed multiple technologies (IP, ATM, FR, SONET/SDH)
- BUsed good QoS mechanisms
- COffered Internet access, VPNs, and telephony
- DEmployed one technology–IP (cost-effective)
- EHad competitive pricing
68Which two statements are true when is used FIB? (Choose Two.)
- Aforward unlabeled IP packets
- Blabel packets
- Cforward labeled packets
- Dswapped by the next-hop label
69Which three statements are true when is used Label Advertisement Control? (Choose Three.)
- AFor scalability and security reasons
- BLDP configured to perform outbound filtering for local label advertisement, for one or more prefixes to one more peers
- CAlso referred to as LDP outbound
- DFor security reasons, or to conserve memory
- EA label binding acceptance configured for a set of prefixes from a
given peer - FAlso referred to as LDP inbound label filtering
70Which three statements are true when is used Label Acceptance Control? (Choose Three.)
- AFor security reasons, or to conserve memory
- BA label binding acceptance configured for a set of prefixes from a
given peer - CAlso referred to as LDP inbound label filtering
- DFor scalability and security reasons
- ELDP configured to perform outbound filtering for local label advertisement, for one or more prefixes to one more peers
- FAlso referred to as LDP outbound
71Which four tables CEF are maintained in XR? (Choose Four.)
- AIPv4 Cisco Express Forwarding database
- BIPv6 Cisco Express Forwarding database
- CMPLS label forwarding database (LFD)
- DMulticast forwarding table (MFD)
- Eadjacency information base
- FARP Cache
- GSwitching cache
72Which statements allow very exact control of the way traffic uses the available bandwidth on L2 VPN Model? (Choose two)
- AManual engineering of PVCs
- BConfiguration of PNNI
- COffline management system
- DSignaling protocol
73The tunnel interface that is used for the specified traffic tunnel (LSP) goes down if the specified LSP is not available for ?
- A10 sec
- B5 sec
- C30 sec
- D60 sec
74The delay is the sum of: (Choose three)
- Apropagation
- Bprocessing
- Cqueuing delays
- Dbandwidth
- Equeue
- Fdelay
75Which of this three option give extra power to class maps? (Choose three)
- AAny condition can be negated by inserting the keyword not.
- BA class map can use another class map to match packets
- CThe any keyword can be used to match all packets
- Dmatch-any is default in Cisco IOS XR Software
- Ematch-all is default in Cisco IOS and IOS XE Software
- FSpecifies the match criterion value that is an
unsuccessful match criterion
76QoS features that can be applied to the network traffic (using the MQC), after
NBAR has recognized and classified the application or protocol (Choose five)- AClass-based marking
- BCBWFQ
- CLLQ
- DTraffic policing
- ETraffic shaping
- FWRED
- GRED
- HPQ
- IClassification
77Currently available PLDMs on NBAR: (Choose 6)
- ABitTorrent
- BeDonkey2000
- CKazaa2
- DGnutella
- EWinMX
- FCitrix ICA
- GNapster
- HFastTrack
- INetshow
- JSQL*NET
78Given this show, How can you get this?
- AP1# show lpts flows brief
- BP1(config)# show lpts flows brief
- CPE1# show lpts pifib brief
- DP1(config)# show lpts pifib brief
79given this show, How can you get this?
- AP1# show lpts flows brief
- BP1# show lpts pifib brief
- CP1(config)#show lpts flows brief
- DP1(config)#show lpts pifib brief
80What LPTS Local traffic types are controlled by Route Processor? (Choose 5)
- ATransit packets, IP option Router Alert
- BManagement traffic (SSH, SNMP, XML)
- CRouting (BGP, OSPF, ISIS, etc.)
- DMulticast control traffic (PIM, HSRP, etc.)
- EBroadcasts
- FICMP
- GMPLS traffic needing fragmentation
- HManagement traffic (NetFlow, Cisco Discovery Protocol)
- IFirst packet of multicast stream
81Given this show, How can you get this?
- Ashow ip nbar port-map
- Bshow ip nbar protocol-discovery stats packet-count top-n 3
- Cshow ip nbar protocol-discovery stats
82Given this show, How can you get this?
- Ashow mpls ldp discovery
- Bshow mpls interfaces detail
- Cshow mpls interfaces
- Dshow mpls ldp parameters
83Given this show, How can you get this?
- Ashow mpls ldp bindings
- Bshow mpls ldp neighbor detail
- Cshow mpls ldp neighbor
- Dshow mpls interfaces detail
84Given this show, How can you get this?
- Ashow mpls forwarding
- Bshow cef
- Cshow mpls ldp bindings
- Dshow mpls ldp neighbor detail
85Given this show, How can you get this?
- Ashow rsvp session
- Bshow rsvp interface
- Cshow mpls traffic-eng tunnels
- Dshow mpls traffic-eng topology
86Given this show, How can you get this?
- Ashow rsvp interface
- Bshow rsvp session
- Cshow mpls traffic-eng tunnels
- Dshow mpls traffic-eng topology
87Given this show, How can you get this?
- Ashow mpls ldp graceful-restart
- Bshow mpls ldp neighbor brief
- Cshow mpls ldp bindings
- Dshow ip mpls ldp graceful-restart
- Eshow ip mpls ldp neighbor brief
88Given this show, How can you get this?
- Ashow mpls ldp neighbor brief
- Bshow mpls ldp graceful-restart
- Cshow ip mpls ldp graceful-restart
- Dshow ip mpls ldp neighbor brief
- Eshow mpls ldp parameters
89What command to display the status of the LDP graceful restart?
- Ashow mpls ldp graceful-restart
- Bshow ip mpls ldp graceful-restart
- Cshow mpls ldp neighbor brief
- Dshow ip mpls ldp neighbor brief
- Eshow mpls ldp parameters
90What command to see if the router is configured for graceful restart?
- Ashow mpls ldp neighbor brief
- Bshow mpls ldp graceful-restart
- Cshow ip mpls ldp neighbor brief
- Dshow ip mpls ldp graceful-restart
- Eshow mpls ldp parameters
- Fshow ip mpls ldp parameters
91What command to debug LDP adjacencies?
- Adebug mpls ldp
- Bdebug ip mpls ldp
- Cdebug mpls packet (interface)
- Ddebug mpls traffic-eng ldp
- Edebug mpls ldp adj-grp
92How can you clear auto-bw timers?
- Aclear mpls trafficking auto-bw timers
- Bclear mpls traffic-eng counters all
- Cclear mpls traffic-eng auto-tunnel
- Dclear mpls traffic-eng auto-bw all
93Shows local link information currently being flooded by MPLS traffic engineering link management into the global traffic engineering topology. What command can you use?
- Ashow mpls traffic-eng link-management advertisements
- Bshow ip mpls traffic-eng link-management advertisements
- Cshow mpls traffic-eng link-management bandwidth-allocation
- Dshow ip mpls traffic-eng link-management bandwidth-allocation
- Eshow rsvp reservation
94• Symptom:
- LDP neighbors are not discovered.
- The show mpls ldp discovery command does not display the expected LDP neighbors.
• Verification:???- AVerify with the show mpls interface command on the adjacent router.
- BVerify connectivity with the extended ping command.
- CVerify that the neighbor LDP router IP address is matched by the access list
specified in the mpls ldp label advertise command. - DExamine the neighbor LDP router IP address with the show mpls ldp
discovery command. - EDebug label distribution with the debug mpls ldp advertisements command.
- FVerify the local LDP identifier with the show mpls ldp neighbors command
95• Symptom:
- LDP neighbors are discovered; the LDP session is not established.
- The show mpls ldp neighbor command does not display a neighbor in operational state.
• Verification:???- AVerify connectivity with the extended ping command.
- BDebug label distribution with the debug mpls ldp advertisements command.
- CExamine the neighbor LDP router IP address with the show mpls ldp discovery command.
- DVerify that the neighbor LDP router IP address is matched by the access list specified in the mpls ldp label advertise command.
- EVerify the local LDP identifier with the show mpls ldp neighbors command.
- FVerify the label MTU setting on routers attached to LAN segments.
96• Symptom:
- Labels are allocated, but not distributed.
- Using the show mpls ldp bindings command on the adjacent LSR does not display labels from this LSR.
• Verification:???
(Choose 3)- ADebug label distribution with the debug mpls ldp advertisements command.
- BExamine the neighbor LDP router IP address with the show mpls ldp discovery command.
- CVerify that the neighbor LDP router IP address is matched by the access list specified in the mpls ldp label advertise command.
- DVerify connectivity with the extended ping command.
- EVerify with the show mpls interface command on the adjacent router.
- FCheck for low-end switches in the transit path.
- GVerify the label MTU setting on routers attached to LAN segments.
97• Symptom:
- The overall MPLS connectivity in a router intermittently breaks after an interface failure.
• Verification: ???- AVerify the local LDP identifier with the show mpls ldp neighbors command.
- BVerify that the neighbor LDP router IP address is matched by the access list
specified in the mpls ldp label advertise command. - CExamine the neighbor LDP router IP address with the show mpls ldp
discovery command. - DDebug label distribution with the debug mpls ldp advertisements command.
- EVerify connectivity with the extended ping command.
- FVerify with the show mpls interface command on the adjacent router.
- GIt is recommended to manually set the router ID.
98• Symptom:
- Large packets are not propagated across the network.
- Use of the extended ping command with varying packet sizes fails for packet sizes almost to 1500 packets.
- In some cases, MPLS might work, but MPLS VPN will fail.
• Verification: ??? Choose 3- AIssue the traceroute command through the forwarding path; identify all LAN segments in the path.
- BVerify the label MTU setting on routers attached to LAN segments.
- CCheck for low-end switches in the transit path.
- DVerify the local LDP identifier with the show mpls ldp neighbors command.
- EVerify that the neighbor LDP router IP address is matched by the access list specified in the mpls ldp label advertise command.
- FExamine the neighbor LDP router IP address with the show mpls ldp discovery command.
- GDebug label distribution with the debug mpls ldp advertisements command.
99Packets are labeled and sent, but they are not received on the neighboring router and In some cases, MPLS might work, but MPLS VPN will fail.
What can you do to fix this? (Choose 1)- AChange the MPLS MTU size, taking into account the maximum number of labels that may appear in a packet
- BManually configure the LDP router ID, referencing a loopback interface that is reachable by the IGP.
- CCheck whether conditional label advertising is enabled and verify both access lists that are used with the command.
- DCheck the reachability of the loopback interfaces, because they are typically used to establish the LDP session. Make sure that the loopback addresses are exchanged via the IGP that is used in the network.
- EEnable MPLS on the neighboring router.
100The overall MPLS connectivity in a router intermittently breaks after an interface failure. MPLS connectivity is established, labels are exchanged, and packets are labeled and forwarded.
The IP address of a physical interface is used for the LDP identifier. Configure a loopback interface on the router.
How can you fix this?- AManually configure the LDP router ID, referencing a loopback interface that is reachable by the IGP.
- BChange the MPLS MTU size, taking into account the maximum number of labels that may appear in a packet.
- CCheck whether conditional label advertising is enabled and verify both access lists that are used with the command.
- DCheck the reachability of the loopback interfaces, because they are typically used to establish the LDP session. Make sure that the loopback addresses are exchanged via the IGP that is used in the network.
101Labels are generated for local routes on one LSR but are not received on neighboring LSRs. Using the show mpls ldp bindings command on the adjacent LSR does not display labels from this LSR.
How can you fix this?- ACheck whether conditional label advertising is enabled and verify both access lists that are used with the command.
- BManually configure the LDP router ID, referencing a loopback interface that is reachable by the IGP.
- CChange the MPLS MTU size, taking into account the maximum number of labels that may appear in a packet.
- DCheck the reachability of the loopback interfaces, because they are typically used to establish the LDP session. Make sure that the loopback addresses are exchanged via the IGP that is used in the network.
102LDP neighbors are exchanging hello packets, but the LDP session is never established. The show mpls ldp neighbor command does not display a neighbor in operational state.
How can you fix this?- ACheck the reachability of the loopback interfaces, because they are typically used to establish the LDP session. Make sure that the loopback addresses are exchanged via the IGP that is used in the network.
- BCheck whether conditional label advertising is enabled and verify both access lists that are used with the command.
- CManually configure the LDP router ID, referencing a loopback interface that is reachable by the IGP.
- DChange the MPLS MTU size, taking into account the maximum number of labels that may appear in a packet.
103If MPLS is enabled on an interface, but no neighbors are discovered, it is likely that MPLS is not enabled on the neighbor.
The show mpls ldp discovery command does not display the expected LDP neighbors.
How can you fix this?- AEnable MPLS on the neighboring router.
- BCheck the reachability of the loopback interfaces, because they are typically used to establish the LDP session. Make sure that the loopback addresses are exchanged via the IGP that is used in the network.
- CCheck whether conditional label advertising is enabled and verify both access lists that are used with the command.
- DManually configure the LDP router ID, referencing a loopback interface that is reachable by the IGP.
- EChange the MPLS MTU size, taking into account the maximum number of labels that may appear in a packet.
104LPTS, Complex forwarding decisions are: (Choose 3)
- AIngress line card identifies the destination stack
- BDRP
- CNSR may force replication to active/standby RPs
- DPort arbitrator
- EFlow managers
- FTables such as the IFIB that route packets to the correct route processor or line card
105LPTS, Components: (Choose 3)
- APort arbitrator
- BFlow managers
- CTables such as the IFIB that route packets to the correct route processor or line card
- DIngress line card identifies the destination stack
- EDRP
- FNSR may force replication to active/standby RPs
106Rule of fabric redundancy on XR Forwarding system, what is?
- Aconnected to the egress line card for delivery to the appropriate interface and subinterface.
- Bsupports multicast replication, and delivers the cells to the appropriate stage 3 fabric cards associated with the egress line card shelf.
- Cconnected to the ingress line card, and delivers the cells across all stage 2 fabric cards.
- DProvide the interface circuitry
- EProvides the communication path between the line cards.
- FResponsible for packet lookup and packet processing
107 A few examples of central services VPNs are: (Choose 4)
- AInternet access
- BCentralized management of managed customer devices
- CIP telephony
- DIPTV
- EL3vpn
- FL2vpn
- GPoint to multipoint
108The Cisco IOS platform supports three IP switching mechanisms:
- ARouting table-driven switching
- BCache-driven switching
- CTopology-driven switching
- DCisco Express Forwarding
- EMost recent destinations entered in the cache
- FFull lookup for every packet
- Gdriven switching
109 Cisco Express Forwarding offers these benefits: (Choose 3)
- AImproved performance
- BScalability
- CResilience
- DSoftware performance
- EPacket-trigger
- FFull lookup for every packet
110Each Queue in CBWFQ has a queue size. Choose the 3 correct answer
- ACisco IOS XR platforms use dynamic thresholds.
- BMaximum queue size is platform dependent.
- CMaximum number of packets that it can hold.
- DIf the queue limit has been reached, tail drop within each class
- ECBWFQ guarantees bandwidth according to weights assigned to traffic
classes. - FCBWFQ supports multiple class maps to classify traffic into its corresponding FIFO queues
111Classification in CBWFQ Choose the 3 correct answer
- AUses class maps.
- BAfter classification, packet enqueued
- CIf the queue limit has been reached, tail drop within each class
- DCisco IOS XR platforms use dynamic thresholds.
- ECBWFQ supports multiple class maps to classify traffic into its corresponding FIFO queues.
- FTail drop is the default dropping scheme of CBWFQ.
112Whit three command are necessari to make QPPB Policy?
- Aroute-policy qppb-src10-20
- Bipv4 bgp policy propagation input qos-group source
- Ctable-policy qppb-src10-20
- Dtable-policy input qppb-src10-20
- Eipv4 bgp policy propagation output qos-group source
- Fpolicy-map qppb-src10-20
- Gipv4 bgp policy propagation output qos-group destination
113How can you enter in LPTS config mode and apply to location 1? Choose 2
- Alpts pifib hardware police
- Blpts pifib police
- Clpts pifib hardware police input
- Dlpts pifib hardware police location 0/1/CPU0 input
- Elpts pifib hardware police location 0/1/CPU0
- Flpts pifib hardware police input location 0/1/CPU0
Información
- Descripción
- Test sobre Test 3, creado por paperina peper el 05/08/2016.
- Autor
- paperina peper
- Idioma
- English
- Visitas
- 6
- Valoración
- Aún sin valoraciones Valora este test