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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 NOT a possible cause of this problem ?

An enable-secret password has not been configured on one, or both of the routers

Mismatched AS number.

An improper network statement or wildcard mask is not putting the correct interfaces into the EIGRP routing process

One of the serial ports has been configured as a passive-interface

Mismatched authentication parameters

The k-values are different.

Explanation

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