Which of the following messages to exchange routing information between peers?

Question

Options

• AOpen
• BKeepalive
• CUpdate
• DRoute-refresh

• A
  15% (5)
• B
  3% (1)
• C
  74% (25)
• D
  9% (3)

Explanation

Update messages are the BGP message type specifically designed to exchange routing information between peers - they carry both newly advertised prefixes (with path attributes like AS_PATH, NEXT_HOP, and MED) and withdrawn routes that are no longer reachable. Open messages are wrong because they are used only at the start of a BGP session to negotiate parameters like BGP version and hold time. Keepalive messages are wrong because they simply acknowledge Open messages and prevent session timeout - they carry no routing data. Route-refresh is wrong because it requests a peer to re-send its routing table, but the actual routing information itself travels in Update messages.

Memory tip: Think "U = Update = Useful routing data" - it's the only BGP message type that actually moves network reachability information between routers.

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