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Two routers are connected through their serial interfaces and configured with EIGRP. Both routers can ping each other, but for some reason they cannot establish a neighbor relationship.
Which of the following is a possible cause of this problem ?
One of the serial ports has been configured as a passive-interface
Mismatched authentication parameters
An improper network statement or wildcard mask is not putting the correct interfaces into the EIGRP routing process
Mismatched AS number.
An enable-secret password has not been configured on one, or both of the routers
The k-values are different.
The answer is mismatched AS numbers and not the enable secret password.
If the neighbors are in different Autonomous Systems (AS), EIGRP will not form any neighbor relationships. In the output of the command it can be seen that both routers belong to different AS. To solve the issue change either router to belong to same AS.
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