CCNA FAQ: EIGRP
Question: Which of the following affect the calculation of EIGRP metrics when all possible default values are used? (Choose two answers.)
f. Hop count
Question: How does EIGRP notice when a neighboring router fails?
a. The failing neighbor sends a message before failing.
b. The failing neighbor sends a “dying gasp” message.
c. The router notices a lack of routing updates for a period of time.
d. The router notices a lack of Hello messages for a period of time.
Question: Which of the following is true about the concept of EIGRP feasible distance?
a. A route’s feasible distance is the calculated metric of a feasible successor route.
b. A route’s feasible distance is the calculated metric of the successor route.
c. The feasible distance is the metric of a route from a neighboring router’s perspective.
d. The feasible distance is the EIGRP metric associated with each possible route to reach a subnet.
Question: Which of the following is true about the concept of EIGRP reported distance?
a. A route’s reported distance is the calculated metric of a feasible successor route.
b. A route’s reported distance is the calculated metric of the successor route.
c. A route’s reported distance is the metric of a route from a neighboring router’s perspective.
d. The reported distance is the EIGRP metric associated with each possible route to reach a subnet.
Question: Which of the following network commands, following the command router eigrp 1, tells this router to start using EIGRP on interfaces whose IP addresses are 10.1.1.1, 10.1.100.1, and 10.1.120.1? (Choose two answers.)
a. network 10.0.0.0
b. network 10.1.1x.0
c. network 10.0.0.0 0.255.255.255
d. network 10.0.0.0 255.255.255.0
Question: Routers R1 and R2 attach to the same VLAN with IP addresses 10.0.0.1 and 10.0.0.2, respectively. R1 is configured with the commands router eigrp 99 and network 10.0.0.0. Which of the following commands might be part of a working EIGRP configuration on R2 that ensures that the two routers become neighbors and exchange routes? (Choose two answers.)
a. network 10
b. router eigrp 98
c. network 10.0.0.2 0.0.0.0
d. network 10.0.0.0
Question: Examine the following excerpt from a router’s CLI:
P 10.1.1.0/24, 1 successors, FD is 2172416
via 10.1.6.3 (2172416/28160), Serial0/1
via 10.1.4.2 (2684416/2284156), Serial0/0
via 10.1.5.4 (2684416/2165432), Serial1/0
Which of the following identifies a next-hop IP address on a feasible successor route?
d. It cannot be determined from this command output.
the third route’s RD is less than or equal to the feasible distance (the metric of the successor route).
Question: Which of the following must occur to configure MD5 authentication for EIGRP? (Choose two answers.)
a. Setting the MD5 authentication key via some interface subcommand
b. Configuring at least one key chain
c. Defining a valid lifetime for the key
d. Enabling EIGRP MD5 authentication on an interface
Question: In the show ip route command, what code designation implies that a route was learned with EIGRP?
Question: There are three possible routes for a router to reach a destination network. The first route is from OSPF with a metric of 782. The second route is from RIPv2 with a metric of 4. The third is from EIGRP with a composite metric of 20514560. Which route will be installed by the router in its routing table?
D. All three
Question: Which EIGRP information is held in RAM and maintained through the use of Hello and update packets? (Choose two.)
A. Neighbor table
B. STP table
C. Topology table
D. DUAL table
Question: What will be the reported distance to a downstream neighbor router for the 10.10.30.0 network, with the neighbor adding the cost to this neighbor to find the true FD?
P 10.10.30.0/24, 1 successors, FD is 2297856
via 172.16.10.2 (2297856/128256), Serial0/0
A. Four hops
D. EIGRP doesn’t use reported distances.
Question: Where are EIGRP successor routes stored?
A. In the routing table only
B. In the neighbor table only
C. In the topology table only
D. In the routing table and the neighbor table
E. In the routing table and the topology table
F. In the topology table and the neighbor table
Question: Which command will display all the EIGRP feasible successor routes known to a router?
A. show ip routes *
B. show ip eigrp summary
C. show ip eigrp topology
D. show ip eigrp adjacencies
E. show ip eigrp neighbors detail
Question: Which of the following commands are used when routing with EIGRP or EIGRPv6? (Choose three.)
A. network 10.0.0.0
B. eigrp router-id
D. router eigrp
Question: Serial0/0 goes down. How will EIGRP send packets to the 10.1.1.0 network?
Corp#show ip eigrp topology
[output cut] P 10.1.1.0/24, 2 successors, FD is 2681842
via 10.1.2.2 (2681842/2169856), Serial0/0
via 10.1.3.1 (2973467/2579243), Serial0/2
via 10.1.3.3 (2681842/2169856), Serial0/1
A. EIGRP will put the 10.1.1.0 network into active mode.
B. EIGRP will drop all packets destined for 10.1.1.0.
C. EIGRP will just keep sending packets out s0/1.
E. EIGRP will use s0/2 as the successor and keep routing to 10.1.1.0. 840 Chapter 19 u Enhanced IGRP
Question:What command do you use to enable EIGRPv6 on an interface?
A. router eigrp as
B. ip router eigrp as
C. router eigrpv6 as
D. ipv6 eigrp as
Question: What command was typed in to have these two paths to network 10.10.50.0 in the routing table?
D 10.10.50.0 [90/2297856] via 172.16.10.6, 00:00:20, Serial0/1
[90/6893568] via 172.16.10.2, 00:00:20, Serial0/0
A. maximum-paths 2
B. variance 2
C. variance 3
D. maximum-hops 2
10. A route to network 10.10.10.0 goes down. How does EIGRP respond in the local routing table? (Choose two.)
A. It sends a poison reverse with a maximum hop of 16.
B. If there is a feasible successor, that is copied and placed into the routing table.
C. If a feasible successor is not found, a query will be sent to all neighbors asking for a path to network 10.10.10.0.
D. EIGRP will broadcast out all interfaces that the link to network 10.10.10.0 is down and that it is looking for a feasible successor.
Question: You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers need to be checked. What command will display the required information?
A. show ip eigrp adjacency
B. show ip eigrp topology
C. show ip eigrp interfaces
D. show ip eigrp neighbors
Question: For some reason, you cannot establish an adjacency relationship on a common Ethernet link between two routers. Looking at the output shown here, what are the causes of the problem? (Choose two.)
A. EIGRP is running on RouterA and OSPF is running RouterB.
B. There is an ACL set on the routing protocol.
C. The AS numbers don’t match.
D. There is no default network accepted from incoming updates.
E. The K-values don’t match.
F. There is a passive interface set.
Question: Which are true regarding EIGRP successor routes? (Choose two.)
A. A successor route is used by EIGRP to forward traffic to a destination.
B. Successor routes are saved in the topology table to be used if the primary route fails.
C. Successor routes are flagged as “active” in the routing table.
D. A successor route may be backed up by a feasible successor route.
E. Successor routes are stored in the neighbor table following the discovery process.
Question: The remote RouterB router has a directly connected network of 10.255.255.64/27. Which two of the following EIGRP network statements could you use so this directly connected network will be advertised under the EIGRP process? (Choose two.)
A. network 10.255.255.64
B. network 10.255.255.64 0.0.0.31
C. network 10.255.255.64 0.0.0.0
D. network 10.255.255.64 0.0.0.15
Question: RouterA and RouterB are connected via their Serial 0/0 interfaces, but they have not formed an adjacency. Based on the following output, what could be the problem?
A. The metric K values don’t match.
B. The AS numbers don’t match.
C. There is a passive interface on RouterB.
D. There is an ACL set on RouterA.
Question: How many paths will EIGRPv6 load-balance by default?
Question: What would your configurations be on RouterB based on the illustration? (Choose two.)
A. (config)#router eigrp 10
B. (config)#ipv6 router eigrp 10
C. (config)#ipv6 router 2001:db8:3c4d:15::/64
D. (config-if)#ip eigrp 10
E. (config-if)#ipv6 eigrp 10
F. (config-if)#ipv6 router eigrp 10
Question: RouterA has a feasible successor not shown in the following output. Based on what
you can learn from the output, which one of the following will be the successor for
2001:db8:c34d:18::/64 if the current successor fails?
via FE80::201:C9FF:FED0:3301 (29110112/33316), Serial0/0/0
via FE80::209:7CFF:FE51:B401 (4470112/42216), Serial0/0/1
via FE80::209:7CFF:FE51:B401 (2170112/2816), Serial0/0/2
D. There is no feasible successor.
Question: You have an internetwork as shown in the following illustration with routers running IOS 12.4. However, the two networks are not sharing routing table route entries. What is the problem?
A. The variances don’t match between routers.
B. The metrics are not valid between neighbors.
C. There is a discontiguous network.
D. There is a passive interface on RouterB.
E. An ACL is set on the router.
Question: Which should you look for when troubleshooting an adjacency? (Choose four.)
A. Verify the AS numbers.
B. Verify that you have the proper interfaces enabled for EIGRP.
C. Make sure there are no mismatched K values.
D. Check your passive interface settings.
E. Make sure your remote routers are not connected to the Internet.
F. If authentication is configured, make sure all routers use different passwords.
uu Interfaces between the devices are down.
uu The two routers have mismatching EIGRP autonomous system numbers.
uu Proper interfaces are not enabled for the EIGRP process.
uu An interface is configured as passive.
uu K values are mismatched.
uu EIGRP authentication is misconfigured.