(Topic 1) Which of the following features are supported by IS-IS? Choose three answers.

(Topic 1) Which of the following features are supported by IS-IS? Choose three answers.
A . PDU authentication.
B . The ability to customize the link cost metric.
C . Use of Bellman-Ford routing algorithm.
D . Classless routing.
E . Updates sent as layer 3 multicast.

Answer: A,B,D