Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 309

Which role does the Adjacency-SID sub-TLV extension perform in the IS-IS routing protocol?

Answer options

• A. It is advertised within TLV-136 (Extended IP Reachability) to label a specific node in the network.
• B. It is advertised within TLV-145 (IS-IS Prefix Reachability Information) to label host prefixes on loopback interfaces on Level 2 routers within one IS-IS area
• C. It is advertised within TLV-24 (IS-IS Neighbor Adjacency Attribute) to label a specific adjacency between Level 1 routers within one IS-IS area
• D. It is advertised within TLV-22 (Extended IS Reachability) to label a specific link in a segment routing domain

Correct answer: D

Explanation

The correct answer is D because the Adjacency-SID sub-TLV is utilized within TLV-22 to identify specific links in segment routing domains. Option A is incorrect as it pertains to TLV-136, while B and C refer to TLV-145 and TLV-24 respectively, which are not related to the Adjacency-SID function.