Nokia NRS II Composite Exam 4A0-C01 Question # 139 Topic 14 Discussion
4A0-C01 Exam Topic 14 Question 139 Discussion:
Question #: 139
Topic #: 14
If two routers running IS-IS protocols are exchanging Hello packets with different authentication types, which of the following statements regarding the adjacency state established between them is true?
A.
Different authentication types are not possible because IS-IS only supports password authentication.
B.
An adjacency will not be formed
C.
The two routers negotiate the authentication type and then reach the up state.
D.
Only an L2 adjacency will form, as long as both routers are L2 capable.
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