Cisco Enterprise Network Core Technologies (ENCOR) 2025 – 400 Free Practice Questions to Pass the Exam

The Adj-RIB-in table holds route prefixes that a router has received from its neighbors. This is essential for the operation of a routing protocol, as it serves as a data repository for all the route information obtained from adjacent routers. When a router receives updates from its peers, those prefixes are stored in the Adj-RIB-in table before any processing occurs for best path selection or other routing decisions.

The role of the Adj-RIB-in table is fundamental because it contains unfiltered and unmodified updates received from neighboring routers, reflecting the current state of the network as perceived by those routers. This data serves as the basis for the router's route calculations and updates. In contrast, other options refer to different aspects of routing tables: the best path selection occurs after the information is processed, the prefixes sent to neighbors are typically stored in a different table, and local routes originate from the router itself and would be stored in a separate structure.