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WAN Technologies CH 4-5 Exam

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WAN Technologies (CCNA 4) CH 4-5 Exam
Anthony Schulmeister
Quiz by Anthony Schulmeister, updated more than 1 year ago
Anthony Schulmeister
Created by Anthony Schulmeister about 8 years ago
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Resource summary

Question 1

Question
Which two functions are provided by the Local Management Interface (LMI) that is used in Frame Relay networks? (Choose two.)
Answer
  • mapping of DLCIs to network addresses
  • error notification
  • exchange of information about the status of virtual circuits
  • congestion notification
  • simple flow control

Question 2

Question
Refer to the exhibit. A network administrator is configuring Frame Relay subinterfaces on R1. A distance vector routing protocol has also been configured. Data is routing successfully from R1 to networks that are connected to R2, R3, and R4, but routing updates between R2 and R3 are failing. What is the possible cause of this failure?
Image:
01757cd5-3f6e-4f85-afaf-35bb38afa341 (image/png)
Answer
  • Subinterfaces cannot be used on multipoint Frame Relay links.
  • Split horizon is preventing successful routing table updates on the multipoint link.
  • Multipoint Frame Relay networks cannot be used with this IP addressing scheme
  • Two DLCI identifiers cannot be configured on one subinterface

Question 3

Question
What are the two major criteria that constitute the cost of a Frame Relay circuit? (Choose two.)
Answer
  • local loop
  • circuit management fees
  • QoS
  • end-to-end connectivity
  • required bandwidth

Question 4

Question
A network administrator uses the following command to configure a Frame Relay connection on a router towards the service provider: R1(config-if)# frame-relay map ip 209.165.200.225 102 broadcast What is the purpose of using the broadcast keyword?
Answer
  • to enable dynamic IP address-to-DLCI mapping
  • to support IP address to MAC address resolution for the interface in the service provider site
  • to support dynamic routing protocol updates across the link
  • to enable VoIP packet transmission across the link

Question 5

Question
Refer to the exhibit. A network administrator issues the show frame-relay map command to troubleshoot the Frame Relay connection problem. Based on the output, what is the possible cause of the problem?
Image:
ae21d9ee-78a3-4e3c-8e16-91edfd523403 (image/png)
Answer
  • Inverse ARP is providing false information to the R1 router
  • The IP address on S0/0/1 of R3 is configured incorrectly
  • The S0/0/1 interface of the R2 router has been configured with the encapsulation frame relay ietf command.
  • The Frame Relay map statement on the R3 router for the PVC to R2 is configured with an incorrect DLCI number.
  • The S0/0/1 interface of the R2 router is down

Question 6

Question
Which two Frame Relay router reachability issues are resolved by configuring logical subinterfaces? (Choose two.)
Answer
  • Inverse ARP fails to associate all IP addresses to the correct DLCIs
  • LMI status inquiry messages sent to the network are not received
  • Link-state routing protocols are unable to complete neighbor discovery
  • Frame Relay is unable to map a remote IP address to a DLCI
  • Distance vector routing protocols are unable to forward routing updates back out the incoming interface to other remote routers.

Question 7

Question
Refer to the exhibit. Which two statements are correct? (Choose two.)
Image:
f1953357-c5ed-4e1b-b09c-46c18bbd24f8 (image/png)
Answer
  • The Frame Relay map was set by using the command frame-relay map.
  • The IPv4 address of interface S0/1/1 on RB is 192.168.1.2.
  • The DLCI that is attached to the VC on RA to RB is 62
  • The IPv4 address of interface S0/1/0 on RA is 192.168.1.2.
  • The DLCI that is attached to the VC on RB to RA is 62

Question 8

Question
The show frame-relay pvc command is best utilized to display the number for which type of packets that are received by the router?
Answer
  • LMI status messages
  • Inverse Neighbor Discovery messages
  • Inverse ARP messages
  • FECN and BECN messages

Question 9

Question
Why would a customer request a Frame Relay circuit with a CIR of zero?
Answer
  • to have a backup circuit for critical data transmissions
  • to have a circuit used for voice traffic
  • to have better QoS
  • to have a circuit used for network management traffic
  • to have a link with reduced costs

Question 10

Question
Which three notification mechanisms are used when congestion is present in a Frame Relay network? (Choose three.)
Answer
  • inverse ARP
  • BECN
  • DLCI
  • FECN
  • CIR
  • DE

Question 11

Question
A router interface connects to a Frame Relay network over a preconfigured logical circuit that does not have a direct electrical connection from end to end. Which type of circuit is being used?
Answer
  • full mesh
  • hub and spoke
  • SVC
  • PVC
  • dedicated leased line

Question 12

Question
What is an advantage of Frame Relay WAN technology compared with leased lines?
Answer
  • It provides permanent dedicated capacity to the customers
  • It supports both voice and data traffic
  • It uses one interface to connect to several remote sites
  • It offers a guaranteed direct electrical circuit from end to end

Question 13

Question
Which three actions can be taken to solve Layer 3 routing protocol router reachability issues when using Frame Relay? (Choose three.)
Answer
  • Use the keyword cisco as the LMI type
  • Use a full mesh topology
  • Use subinterfaces
  • Disable Inverse ARP
  • Disable split horizon.
  • Configure static DLCI mappings

Question 14

Question
A network administrator has statically configured the LMI type on the interface of a Cisco router that is running Cisco IOS Release 11.2. If the service provider modifies its own LMI type in the future, what step must the network administrator take?
Answer
  • The network administrator simply has to verify connectivity with the provider, because the router has an LMI autosensing feature that automatically detects the LMI type.
  • The network administrator must statically set the LMI type to be compatible with the service provider.
  • The network administrator does not have to do anything, because all LMI types are compatible with one another.
  • The network administrator must modify the keepalive time interval to maintain connectivity with the LMI type of the service provider.

Question 15

Question
Which technology allows a Layer 3 IPv4 address to be dynamically obtained from a Layer 2 DLCI?
Answer
  • Inverse Neighbor Discovery
  • Neighbor Discovery
  • Address Resolution Protocol
  • Inverse Address Resolution Protocol

Question 16

Question
When would the multipoint keyword be used in Frame Relay PVCs configuration?
Answer
  • when using physical interfaces
  • when global DLCIs are in use
  • when multicasts must be supported
  • when participating routers are in the same subnet

Question 17

Question
A network administrator of a large organization is designing a Frame Relay network. The organization needs redundancy between some key sites but not all. What WAN topology should the administrator choose to meet their needs?
Answer
  • star
  • extended star
  • full mesh
  • partial mesh

Question 18

Question
A network engineer has issued the interface serial 0/0/1.102 point-to-point command on a router that will be communicating with another router over a Frame Relay virtual circuit that is identified by the DLCI 102. Which two commands would be appropriate for the network engineer to issue next? (Choose two.)
Answer
  • no shutdown
  • encapsulation frame relay
  • no ip address
  • frame-relay interface-dlci 102
  • ip address 10.1.1.10 255.255.255.252

Question 19

Question
Refer to the exhibit. Based on the output that is shown, what type of NAT has been implemented?
Image:
ffc54055-6f48-46b5-96f8-849b5e2c58a4 (image/png)
Answer
  • dynamic NAT with a pool of two public IP addresses
  • static NAT with a NAT pool
  • static NAT with one entry
  • PAT using an external interface

Question 20

Question
Refer to the exhibit. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router?
Image:
0807ce8b-8f50-410d-99f3-52bc6d3f44fa (image/png)
Answer
  • defines which addresses are allowed into the router
  • defines which addresses are allowed out of the router
  • defines which addresses can be translated
  • defines which addresses are assigned to a NAT pool

Question 21

Question
What is the purpose of port forwarding?
Answer
  • Port forwarding allows users to reach servers on the Internet that are not using standard port numbers.
  • Port forwarding allows for translating inside local IP addresses to outside local addresses.
  • Port forwarding allows an internal user to reach a service on a public IPv4 address that is located outside a LAN
  • Port forwarding allows an external user to reach a service on a private IPv4 address that is located inside a LAN.

Question 22

Question
Which statement accurately describes dynamic NAT?
Answer
  • It dynamically provides IP addressing to internal hosts
  • It provides an automated mapping of inside local to inside global IP addresses
  • It always maps a private IP address to a public IP address
  • It provides a mapping of internal host names to IP addresses

Question 23

Question
Which version of NAT allows many hosts inside a private network to simultaneously use a single inside global address for connecting to the Internet?
Answer
  • port forwarding
  • PAT
  • dynamic NAT
  • static NAT

Question 24

Question
Refer to the exhibit. R1 is configured for NAT as displayed. What is wrong with the configuration?
Image:
9ba285a1-a801-44fa-a346-d4aa38fb3b92 (image/png)
Answer
  • Interface Fa0/0 should be identified as an outside NAT interface
  • The NAT pool is incorrect
  • Access-list 1 is misconfigured
  • NAT-POOL2 is not bound to ACL 1.

Question 25

Question
What is a disadvantage of NAT?
Answer
  • The costs of readdressing hosts can be significant for a publicly addressed network.
  • The router does not need to alter the checksum of the IPv4 packets
  • The internal hosts have to use a single public IPv4 address for external communication
  • There is no end-to-end addressing

Question 26

Question
Which prefix is used for IPv6 ULAs?
Answer
  • FF02::1:FF00:0/104
  • 2001:7F8::/29
  • FC00::/7
  • 2001:DB8:1:2::/64

Question 27

Question
How does NAT complicate the use of IPsec?
Answer
  • End-to-end IPv4 traceability is lost.
  • Troubleshooting is made impossible
  • Network performance is degraded even more than with just NAT
  • Header values are modified which causes issues with integrity checks

Question 28

Question
A network administrator configures the border router with the command R1(config)# ip nat inside source list 4 pool corp What is required to be configured in order for this particular command to be functional?
Answer
  • ip nat outside to be enabled on the interface that connects to the LAN affected by the NAT
  • a NAT pool named corp that defines the starting and ending public IP addresses
  • an access list numbered 4 that defines the starting and ending public IP addresses
  • an access list named corp that defines the private addresses that are affected by NAT
  • a VLAN named corp to be enabled and active and routed by R1

Question 29

Question
What is the group of public IPv4 addresses used on a NAT-enabled router known as?
Answer
  • outside local addresses
  • inside local addresses
  • outside global addresses
  • inside global addresses

Question 30

Question
Refer to the exhibit. The NAT configuration applied to the router is as follows: ERtr(config)# access-list 1 permit 10.0.0.0 0.255.255.255 ERtr(config)# ip nat pool corp 209.165.201.6 209.165.201.30 netmask 255.255.255.224 ERtr(config)# ip nat inside source list 1 pool corp overload ERtr(config)# ip nat inside source static 10.10.10.55 209.165.201.4 ERtr(config)# interface gigabitethernet 0/0 ERtr(config-if)# ip nat inside ERtr(config-if)# interface serial 0/0/0 ERtr(config-if)# ip nat outside Based on the configuration and the output shown, what can be determined about the NAT status within the organization?
Image:
46b5e3c4-7005-43ab-9534-a0a4ca41f854 (image/png)
Answer
  • Not enough information is given to determine if both static and dynamic NAT are working.
  • NAT is working
  • Static NAT is working, but dynamic NAT is not
  • Dynamic NAT is working, but static NAT is not

Question 31

Question
Which configuration would be appropriate for a small business that has the public IP address of 209.165.200.225/30 assigned to the external interface on the router that connects to the Internet?
Answer
  • access-list 1 permit 10.0.0.0 0.255.255.255 ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240 ip nat inside source list 1 pool comp overload
  • access-list 1 permit 10.0.0.0 0.255.255.255 ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240 ip nat inside source list 1 pool comp
  • access-list 1 permit 10.0.0.0 0.255.255.255 ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240 ip nat inside source list 1 pool comp overload ip nat inside source static 10.0.0.5 209.165.200.225
  • access-list 1 permit 10.0.0.0 0.255.255.255 ip nat inside source list 1 interface serial 0/0/0 overload

Question 32

Question
When NAT is employed in a small office, which address type is typically used for hosts on the local LAN?
Answer
  • both private and public IP addresses
  • private IP addresses
  • Internet-routable addresses
  • global public IP addresses

Question 33

Question
When dynamic NAT without overloading is being used, what happens if seven users attempt to access a public server on the Internet when only six addresses are available in the NAT pool?
Answer
  • The first user gets disconnected when the seventh user makes the request
  • No users can access the server
  • All users can access the server
  • The request to the server for the seventh user fails

Question 34

Question
Which technology would be used on a router that is running both IPv4 and IPv6?
Answer
  • NAT for IPv6
  • dual stack
  • dynamic NAT
  • static NAT

Question 35

Question
What is a characteristic of unique local addresses?
Answer
  • Their implementation depends on ISPs providing the service
  • They are defined in RFC 3927
  • They allow sites to be combined without creating any address conflicts
  • They are designed to improve the security of IPv6 networks

Question 36

Question
What are two of the required steps to configure PAT? (Choose two.)
Answer
  • Create a standard access list to define applications that should be translated.
  • Define the hello and interval timers to match the adjacent neighbor router
  • Identify the inside interface
  • Define the range of source ports to be used
  • Define a pool of global addresses to be used for overload translation

Question 37

Question
Which type of NAT maps a single inside local address to a single inside global address?
Answer
  • dynamic
  • overloading
  • static
  • port address translation

Question 38

Question
Typically, which network device would be used to perform NAT for a corporate environment?
Answer
  • switch
  • router
  • server
  • host device
  • DHCP server
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