WAN Technologies CH 4-5 Exam

Question 1 of 38

1

Which two functions are provided by the Local Management Interface (LMI) that is used in Frame Relay networks? (Choose two.)

Select one or more of the following:

mapping of DLCIs to network addresses
error notification
exchange of information about the status of virtual circuits
congestion notification
simple flow control

Explanation

Question 2 of 38

1

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?

Select one of the following:

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

Explanation

Question 3 of 38

1

What are the two major criteria that constitute the cost of a Frame Relay circuit? (Choose two.)

Select one or more of the following:

local loop
circuit management fees
QoS
end-to-end connectivity
required bandwidth

Explanation

Question 4 of 38

1

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?

Select one of the following:

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

Explanation

Question 5 of 38

1

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?

Select one of the following:

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

Explanation

Question 6 of 38

1

Which two Frame Relay router reachability issues are resolved by configuring logical subinterfaces? (Choose two.)

Select one or more of the following:

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.

Explanation

Question 7 of 38

1

Refer to the exhibit. Which two statements are correct? (Choose two.)

Select one or more of the following:

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

Explanation

Question 8 of 38

1

The show frame-relay pvc command is best utilized to display the number for which type of packets that are received by the router?

Select one of the following:

LMI status messages
Inverse Neighbor Discovery messages
Inverse ARP messages
FECN and BECN messages

Explanation

Question 9 of 38

1

Why would a customer request a Frame Relay circuit with a CIR of zero?

Select one of the following:

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

Explanation

Question 10 of 38

1

Which three notification mechanisms are used when congestion is present in a Frame Relay network? (Choose three.)

Select one or more of the following:

inverse ARP
BECN
DLCI
FECN
CIR
DE

Explanation

Question 11 of 38

1

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?

Select one of the following:

full mesh
hub and spoke
SVC
PVC
dedicated leased line

Explanation

Question 12 of 38

1

What is an advantage of Frame Relay WAN technology compared with leased lines?

Select one of the following:

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

Explanation

Question 13 of 38

1

Which three actions can be taken to solve Layer 3 routing protocol router reachability issues when using Frame Relay? (Choose three.)

Select one or more of the following:

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

Explanation

Question 14 of 38

1

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?

Select one of the following:

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.

Explanation

Question 15 of 38

1

Which technology allows a Layer 3 IPv4 address to be dynamically obtained from a Layer 2 DLCI?

Select one of the following:

Inverse Neighbor Discovery
Neighbor Discovery
Address Resolution Protocol
Inverse Address Resolution Protocol

Explanation

Question 16 of 38

1

When would the multipoint keyword be used in Frame Relay PVCs configuration?

Select one of the following:

when using physical interfaces
when global DLCIs are in use
when multicasts must be supported
when participating routers are in the same subnet

Explanation

Question 17 of 38

1

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?

Select one of the following:

star
extended star
full mesh
partial mesh

Explanation

Question 18 of 38

1

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.)

Select one or more of the following:

no shutdown
encapsulation frame relay
no ip address
frame-relay interface-dlci 102
ip address 10.1.1.10 255.255.255.252

Explanation

Question 19 of 38

1

Refer to the exhibit. Based on the output that is shown, what type of NAT has been implemented?

Select one of the following:

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

Explanation

Question 20 of 38

1

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?

Select one of the following:

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

Explanation

Question 21 of 38

1

What is the purpose of port forwarding?

Select one of the following:

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.

Explanation

Question 22 of 38

1

Which statement accurately describes dynamic NAT?

Select one of the following:

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

Explanation

Question 23 of 38

1

Which version of NAT allows many hosts inside a private network to simultaneously use a single inside global address for connecting to the Internet?

Select one of the following:

port forwarding
PAT
dynamic NAT
static NAT

Explanation

Question 24 of 38

1

Refer to the exhibit. R1 is configured for NAT as displayed. What is wrong with the configuration?

Select one of the following:

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.

Explanation

Question 25 of 38

1

What is a disadvantage of NAT?

Select one of the following:

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

Explanation

Question 26 of 38

1

Which prefix is used for IPv6 ULAs?

Select one of the following:

FF02::1:FF00:0/104
2001:7F8::/29
FC00::/7
2001:DB8:1:2::/64

Explanation

Question 27 of 38

1

How does NAT complicate the use of IPsec?

Select one of the following:

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

Explanation

Question 28 of 38

1

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?

Select one of the following:

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

Explanation

Question 29 of 38

1

What is the group of public IPv4 addresses used on a NAT-enabled router known as?

Select one of the following:

outside local addresses
inside local addresses
outside global addresses
inside global addresses

Explanation

Question 30 of 38

1

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?

Select one of the following:

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

Explanation

Question 31 of 38

1

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?

Select one of the following:

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

Explanation

Question 32 of 38

1

When NAT is employed in a small office, which address type is typically used for hosts on the local LAN?

Select one of the following:

both private and public IP addresses
private IP addresses
Internet-routable addresses
global public IP addresses

Explanation

Question 33 of 38

1

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?

Select one of the following:

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

Explanation

Question 34 of 38

1

Which technology would be used on a router that is running both IPv4 and IPv6?

Select one of the following:

NAT for IPv6
dual stack
dynamic NAT
static NAT

Explanation

Question 35 of 38

1

What is a characteristic of unique local addresses?

Select one of the following:

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

Explanation

Question 36 of 38

1

What are two of the required steps to configure PAT? (Choose two.)

Select one or more of the following:

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

Explanation

Question 37 of 38

1

Which type of NAT maps a single inside local address to a single inside global address?

Select one of the following:

dynamic
overloading
static
port address translation

Explanation

Question 38 of 38

1

Typically, which network device would be used to perform NAT for a corporate environment?

Select one of the following:

switch
router
server
host device
DHCP server

	Created by Anthony Schulmeister about 8 years ago

WAN Technologies (CCNA 4) CH 4-5 Exam

WAN Technologies CH 4-5 Exam

Question 1 of 38

Which two functions are provided by the Local Management Interface (LMI) that is used in Frame Relay networks? (Choose two.)

Select one or more of the following:

Explanation

Question 2 of 38

Select one of the following:

Explanation

Question 3 of 38

What are the two major criteria that constitute the cost of a Frame Relay circuit? (Choose two.)

Select one or more of the following:

Explanation

Question 4 of 38

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?

Select one of the following:

Explanation

Question 5 of 38

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?

Select one of the following:

Explanation

Question 6 of 38

Which two Frame Relay router reachability issues are resolved by configuring logical subinterfaces? (Choose two.)

Select one or more of the following:

Explanation

Question 7 of 38

Refer to the exhibit. Which two statements are correct? (Choose two.)

Select one or more of the following:

Explanation

Question 8 of 38

The show frame-relay pvc command is best utilized to display the number for which type of packets that are received by the router?

Select one of the following:

Explanation

Question 9 of 38

Why would a customer request a Frame Relay circuit with a CIR of zero?

Select one of the following:

Explanation

Question 10 of 38

Which three notification mechanisms are used when congestion is present in a Frame Relay network? (Choose three.)

Select one or more of the following:

Explanation

Question 11 of 38

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?

Select one of the following:

Explanation

Question 12 of 38

What is an advantage of Frame Relay WAN technology compared with leased lines?

Select one of the following:

Explanation

Question 13 of 38

Which three actions can be taken to solve Layer 3 routing protocol router reachability issues when using Frame Relay? (Choose three.)

Select one or more of the following:

Explanation

Question 14 of 38

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?

Select one of the following:

Explanation

Question 15 of 38

Which technology allows a Layer 3 IPv4 address to be dynamically obtained from a Layer 2 DLCI?

Select one of the following:

Explanation

Question 16 of 38

When would the multipoint keyword be used in Frame Relay PVCs configuration?

Select one of the following:

Explanation

Question 17 of 38

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?

Select one of the following:

Explanation

Question 18 of 38

Select one or more of the following:

Explanation

Question 19 of 38

Refer to the exhibit. Based on the output that is shown, what type of NAT has been implemented?

Select one of the following:

Explanation

Question 20 of 38

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?

Select one of the following:

Explanation

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?

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?