Which two statements are correct about IS-IS interfaces? (Choose two.)
Which two statements are correct about IS-IS interfaces? (Choose two.)
For IS-IS interfaces, if a point-to-point interface is in both L1 and L2, one combined hello message is sent for both levels. This is done for efficiency and simplification. On the other hand, if a broadcast interface is in both L1 and L2, separate hello messages are sent for each level to ensure proper operation and differentiation between the levels.
Correct answer is B and C
BC is correct
answer B,C