Which of the following parameter information is carried in the BGP Open message? (Multiple choice)

Question

Options

• ALocal autonomous system number
• BRouter ID
• CHold Time
• DRouting attributes

• A
  83% (40)
• D
  17% (8)

Explanation

BGP Open messages are exchanged during the initial session establishment phase and contain the parameters needed for two BGP peers to negotiate a connection. Options A (Local AS Number), B (Router ID), and C (Hold Time) are all mandatory fields in the BGP Open message header - the AS number identifies the sender's autonomous system, the Router ID (a 32-bit value, typically the highest loopback IP) uniquely identifies the BGP speaker, and Hold Time is the proposed inactivity timer (in seconds) that peers negotiate down to the lower of the two values.

Option D is incorrect because routing attributes (such as AS_PATH, NEXT_HOP, MED, and LOCAL_PREF) are carried in BGP Update messages, which come after the session is established - not during the initial Open handshake.

Memory tip: Think of the Open message as a "job application" - you introduce yourself with your name (Router ID), your organization (AS Number), and how long you'll wait for a response (Hold Time). Routing attributes belong in the "resume" you send later (Update messages).

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