Refer to the exhibit. Routers A and B are directly connected and running EIGRP, but they are
unable to form a neighbor relationship. What is the most likely cause?
A.
The network statements are misconfigured.
B.
The IP address statements are misconfigured
C.
The autonomous system is misconfigured.
D.
There is a physical issue with the cable.
Explanation:
To form neighbor relationship in EIGRP, these conditions must be met:
Pass the authentication process
Have the same con figured AS number
Must believe that the source IP address of a received Hello is in that router’s primary connected
subnet on that interface
Match K values
The third item means that the primary ip address of the neighbor must be in the same subnet with
the primary ip address of the received interface. But in this case the primary ip address of router A
is 10.10.10.1/30 and it is not in the same subnet with the primary ip address of router B10.10.10.6/30 -> no EIGRP neighbor relationship is formed.