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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 ?

Mismatched AS number.

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

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

Mismatched authentication parameters

The k-values are different.

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



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