4A0-112: Nokia IS-IS Routing ProtocolDemo

By Nokia · Question Mode

QuestionQ20

SR OS Control Plane Security

Two IS-IS routers are exchanging Hello packets. One router is configured to use authentication, while the other is not. Which statement is TRUE?

  • A An adjacency will be established with authentication using the default parameters defined for IS-IS routers.
  • B The two routers will negotiate the authentication parameters and the establish an adjacency.
  • C An adjacency will be established without authentication.
  • D An adjacency will not be established.
Explanation

IS-IS authentication settings must be compatible on neighboring routers. An authenticated IS-IS Hello cannot be validated by a neighbor that does not use the configured authentication, and authentication is not negotiated during adjacency formation; therefore, no adjacency is established.

Learn more

Community Discussion

No comments yet. Be the first to start the discussion!