4A0-112: Nokia IS-IS Routing Protocol

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?

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.

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