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New CCNA - EIGRP Common Question.

This is an Updated real CCNA exam question (October, 2013). You might see a different IP addressing, VLAN configuration and Port allocation and EIGRP Configurations.

As usual, take time to read through the question so as to clearly understand what Cisco want you to do.

Note: This EIGRP LAB are used for demonstration only,you will see different IP addressing,  configuration and Port allocation in the real CCNA exam. But it all works the same way, try and understand the technique.

I suggest you use packet tracer for practice.

Download Cisco Packet tracer here


Question 1

A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20684570. Another route is from OSPF with a metric of 852. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?

A. the OSPF route
B. the EIGRP route
C. the RIPv2 route
D. all three routes
E. the OSPF and RIPv2 routes

Answer: B


This is one of those tricky questions just to test your knowledge of routing protocols and their administrative distance. Let’s look at the AD of popular routing protocols below:

Routing Protocol (Source)


 Distance (AD)

Directly connected


Static Route




Summary Route (EIGRP)






From the above table, you can see that EIGRP has the lowest AD from all of the above mentioned routing protocols. So, the router will choose to use the routing protocol which has lowest Administrative Distance which in this case is B. EIGRP.

Question 2

Use the exhibit below. Based on the shown routing table, how will packets from a host within the LAN be forwarded to

A. The router will forward packets from R3 to R2 to R1
B. The router will forward packets from R3 to R1
C. The router will forward packets from R3 to R1 to R2
D. The router will forward packets from R3 to R2 to R1 AND from R3 to R1

Answer: D


From the exhibit, you will know that the routing protocol involved here is EIGRP (D), one of its good features is load balancing. So what happening here is load balancing according to the exhibit.

So packets from a host within the LAN will be forwarded to through network which is learned via 2 equal-cost paths ( &

Question 3

Refer to the exhibit. The company uses EIGRP as the routing protocol. What path will packets take from a host on network to a host on the LAN attached to router R1?

A. The path of the packets will be R3 to R2 to R1.
B. The path of the packets will be R3 to R1 to R2.
C. The path of the packets will be both R3 to R2 to R1 and R3 to R1.
D. The path of the packets will be R3 to R1

Answer: D


Looking at the output display above, the LAN attached to router R1 belongs to subnet and learned this network via which is will be an IP address in sub network. This means that packets destined for will be routed from R3 to R1 .


Question 4

Refer to the exhibit. A packet with a source IP address of and a destination IP address of arrives at the AcmeB router. What action does the router take?
 CCNA EIGRP Common questions

A. forwards the received packet out the Serial0/0 interface
B. forwards a packet containing an EIGRP advertisement out the Serial0/1 interface
C. forwards a packet containing an ICMP message out the FastEthemet0/0 interface
D. forwards a packet containing an ARP request out the FastEthemet0/1 interface

Answer: C


Looking at the output above, there is no IP route for address on AcmeB routing table. If the router can no find a specific path in its routing table to a particular route,( In this case no path is found so AcmeB) the router will inform the source host with an ICMP message that the destination is unreachable and this will be through the same interface it has received the packet (interface Fa0/0 network from the exhibit).

Question 5

Refer to the exhibit. From RouterA, a network administrator is able to ping the serial interface of RouterB but unable to ping any of the subnets attached to RouterB. Based on the partial outputs in the exhibit, what could be the problem?
CCNA EIGRP Common questions
ccna eigrp common questions

A. EIGRP does not support VLSM.
B. The EIGRP network statements are incorrectly configured.
C. The IP addressing on the serial interface of RouterA is incorrect.
D. The routing protocol has summarized on the classful boundary.
E. EIGRP has been configured with an invalid autonomous system number.

Answer: D


If you look carefully at the R2 ip route, you will discover that the R2 does not learn any network from R1; this is because the routing protocol used here (EIGRP) performs auto summary when advertising routes to peers across a network. So in this case the address is a summarized address. If the router was configured with no auto summary command, R2 LAN addresses would have been advertised and reached.

 CCNA EIGRP Lab Question

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