Cisco ENCOR Practice Exam 2026 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

Network Layer Reachability Information (NLRI) is a critical component in routing protocols, particularly in the context of BGP (Border Gateway Protocol). It refers to the information that specifies the IP prefixes that a router is able to reach. This includes the IP address and the associated subnet mask, indicating which destinations can be routed based on current routing decisions.

NLRI is essential because it allows routers to exchange this information to build a routing table that defines how packets should be forwarded across an interconnected network. When routers communicate their NLRI, they inform each other of which networks are reachable and which paths are available, thus facilitating efficient routing decisions.

The other options do not accurately define NLRI. While "Network Layer Routing Information" might seem somewhat relevant, it lacks the specificity that NLRI conveys regarding reachability, which is a fundamental aspect of route advertisement in networking. Terms like "Resource Identifier" or "Report Information" do not relate to NLRI in the context of routing protocols and thus do not capture the intended meaning associated with NLRI in the networking domain.