RIPE Border Gateway Protocol (BGP) Security Practice Test

What fields does an Update message contain?

Withdrawn Routes, Path Attributes and Network Layer Reachability Information Version, Hold Time, Router ID AS Path, Next Hop, Community NLRI Only

Correct Answer:

Withdrawn Routes, Path Attributes and Network Layer Reachability Information

Explanation:

An Update message in BGP communicates changes to the routing table. It consists of three parts: Withdrawn Routes (prefixes to remove), Path Attributes (metadata like AS_PATH, NEXT_HOP, ORIGIN, etc.), and NLRI (the new or announced prefixes). Withdrawn Routes removes previously advertised paths, Path Attributes apply to the routes being announced, and NLRI lists the prefixes that are now reachable. The Version, Hold Time, and Router ID belong to the OPEN message, not Update, and an Update message is not just NLRI alone.

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