Cisco Enterprise Network Core Technologies (ENCOR) Practice Exam

In the context of Border Gateway Protocol (BGP), NLRI stands for Network Layer Reachability Information. This term refers to the data that BGP uses to convey reachability information about networks. Specifically, NLRI includes IP prefixes that BGP routers advertise to inform other routers about which IP networks are reachable and what next-hop addresses should be used to reach those networks. Understanding NLRI is essential in BGP because it allows routers to determine how to forward packets across the network. The format typically consists of the prefix length and the associated address, enabling other BGP peers to make informed routing decisions based on this information. The other choices do not accurately capture the intended meaning. "Network Layer Routing Information," for example, might suggest broader routing details beyond what NLRI specifies. "Network Link Reachability Information" inaccurately suggests a focus on link states rather than network prefixes. Lastly, "Network Local Route Information" is misleading as it does not accurately reflect the purpose of the BGP advertisements, which are meant for global routing between different networks rather than local route management.