Alcatel-Lucent NRS I – Interior Routing Protocols and High Availability — Question 13

Two IS-IS L1/L2 routers are in the same area on the same Ethernet segment. One of the routers is the DIS. How many adjacencies will be formed between them?

Answer options

• A. None
• B. 1
• C. 2
• D. 3
• E. 4

Correct answer: C

Explanation

In an IS-IS network, when two L1/L2 routers form an adjacency, they establish two connections: one for each direction of communication. Therefore, in this case, the correct answer is 2 (C), while the other options do not accurately reflect the adjacency formation process in IS-IS.