Which three reasons would account for this issue?

You want to establish an IS-IS Level 1 adjacency between two routers. The adjacency is not forming.

Which three reasons would account for this issue? (Choose three.)
A . A lack of or a malformed ISO network entity title (NET) on the loopback interface would cause this issue.
B . The interface MTU might be less than 1492.
C . The IS-IS protocol on the loopback interface has not been enabled.
D . The area IDs might be matched and should be set differently.
E . An ISO NET might not be configured on the physical interface.

View Answer

Answer: A,B,C