A county courts campus enables keyed MD5 authentication on named-mode EIGRP, after which one peer remains down while others form. What should operators treat as the most likely adjacency blocker?
Select an answer to reveal the explanation.
Short Explanation
If three peers wave the same secret handshake and one does not, that loner never gets past the door. Auth mismatch kills adjacency before variance, stubs, or leak-maps even matter. Match the key chain and string first.
Full Explanation
EIGRP authentication must agree on both sides; a key-chain or key-string mismatch prevents adjacency. Variance, stub, and leak-map features affect path selection, query behavior, or advertisement content after (or independent of) neighbor formation. When only one peer fails after enabling auth, configuration asymmetry on that pair is the primary suspect.