EIGRP

Question 1

A network administrator is troubleshooting an EIGRP problem on a router and needs to confirm the IP addresses of the devices with which the router has established adjacency. The retransmit interval and the queue counts for the adjacent routers also need to be checked. What command will display the required information?
A. Router# show ip eigrp neighbors
B. Router# show ip eigrp interfaces
C. Router# show ip eigrp adjacency
D. Router# show ip eigrp topology

Answer 1

A. Router# show ip eigrp neighbors

Question 2

Which option describes a difference between EIGRP for IPv4 and IPv6?
A. Only EIGRP for IPv6 advertises all connected networks.
B. Only EIGRP for IPv6 requires a router ID to be configured under the routing process
C. AS numbers are configured in EIGRP but not in EIGRPv3.
D. Only EIGRP for IPv6 is enabled in the global configuration mode.

Answer 2

B. Only EIGRP for IPv6 requires a router ID to be configured under the routing process

Question 3

Which EIGRP for IPv6 command can you enter to view the link-local addresses of the neighbors of a device?
A. show ipv6 eigrp 20 interfaces
B. show ipv6 route eigrp
C. show ipv6 eigrp neighbors
D. show ip eigrp traffic

Answer 3

C. show ipv6 eigrp neighbors

The “show ipv6 eigrp neighbors” command displays the neighbors discovered by the EIGRPv6. Notice that the neighbors are displayed by their link-local addresses.

Question 4

Which function allows EIGRP peers to receive notice of implementing topology changes?
A. successors
B. advertised changes
C. goodbye messages
D. expiration of the hold timer

Answer 4

C. goodbye messages

The goodbye message is a feature designed to improve EIGRP network convergence. The goodbye message is broadcast when an EIGRP routing process is shutdown to inform adjacent peers about the impending topology change. This feature allows supporting EIGRP peers to synchronize and recalculate neighbor relationships more efficiently than would occur if the peers discovered the topology change after the hold timer expired.

The following message is displayed by routers that run a supported release when a goodbye message is received:

*Apr 26 13:48:42.523: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.1.1.1 (Ethernet0/0) is down: Interface Goodbye received
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfeigrp.html

Note: In this question we should understand “impending”, not “implementing” as there are no correct answers with “implementing” topology change.

Question 5

What are the address that will show at the “show ip route” if we configure the above statements? (Choose three)
router eigrp 100
network 172.15.4.0
network 10.4.3.0
network 192.168.4.0
auto-summary
A. 10.0.0.0
B. 10.4.3.0
C. 172.15.4.0
D. 172.15.0.0
E. 192.168.4.0
F. 192.168.0.0

Answer 5

A. 10.0.0.0
D. 172.15.0.0
E. 192.168.4.0

With auto-summary feature is turned on, EIGRP will summary these networks to their classful networks automatically. For example:
\+ 172.15.4.0 belongs to class B so it will be summarized to 172.15.0.0
\+ 10.4.3.0 belongs to class A so it will be summarized to 10.0.0.0
\+ 192.168.4.0 belongs to class C so it will be summarized to 192.168.4.0 (same)

Question 6

What does split horizon prevent?
A. routing loops, link state
B. routing loops, distance vector
C. switching loops, STP
D. switching loops, VTP

Answer 6

B. routing loops, distance vector

Split horizon is used in distance vector routing protocols (like RIP, EIGRP) to prevent routing loops by prohibiting a router from advertising a route back to the interface from which it was learned.

Question 7

What is called when variance with two times of metric?
A. unequal cost load balancing
B. path selection
C. equal cost load balancing
D. other

Answer 7

A. unequal cost load balancing

EIGRP provides a mechanism to load balance over unequal cost paths (or called unequal cost load balancing) through the “variance” command. In other words, EIGRP will install all paths with metric < variance * best_metric into the local routing table, provided that it meets the feasibility condition (to prevent routing loop). The feasibility condition states that, the Advertised Distance (AD) of a route must be lower than the feasible distance of the current successor route.

Question 8

Which feature is config by setting a variance that is at least 2 times the metric?
A. unequal cost load balancing
B. path selection
C. equal cost load balancing
D. path count

Answer 8

A. unequal cost load balancing

EIGRP provides a mechanism to load balance over unequal cost paths (or called unequal cost load balancing) through the “variance” command. In other words, EIGRP will install all paths with metric < variance * best_metric into the local routing table, provided that it meets the feasibility condition (to prevent routing loop). The feasibility condition states that, the Advertised Distance (AD) of a route must be lower than the feasible distance of the current successor route.

Question 9

Which two statements about EIGRP on IPv6 device are true? (Choose two)
A. It is configured on the interface
B. It is globally configured
C. It is configured using a network statement
D. It is vendor agnostic
E. It supports a shutdown feature

Answer 9

E. It supports a shutdown feature