H12-821_V1.0 · Question #1007
Please match the following BGP messages with their corresponding functions: Open, Update, Notification, Keepalive Announce and revoke BGP routing, Negotiate BGP peer parameters, Maintain BGP peer…
The correct answer is A. Open: Negotiate BGP peer parameters; Update: Announce and revoke BGP routing; Notification: Report error message, terminate peer relationship; Keepalive: Maintain BGP peer relationships. Option A correctly pairs each BGP message type with its defined function in RFC 4271: Open initiates a BGP session and negotiates parameters (AS number, hold time, BGP identifier); Update is the workhorse message that advertises new routes or withdraws previously announced…
Question
Options
- AOpen: Negotiate BGP peer parameters; Update: Announce and revoke BGP routing; Notification: Report error message, terminate peer relationship; Keepalive: Maintain BGP peer relationships
- B
- C
- D
How the community answered
(24 responses)- A71% (17)
- B17% (4)
- C4% (1)
- D8% (2)
Explanation
Option A correctly pairs each BGP message type with its defined function in RFC 4271: Open initiates a BGP session and negotiates parameters (AS number, hold time, BGP identifier); Update is the workhorse message that advertises new routes or withdraws previously announced ones; Notification signals a fatal error and immediately terminates the peer session; and Keepalive is sent periodically to confirm the session is still alive between Update intervals. Since only option A is provided with content (B, C, and D are blank distractors), the matching itself is the core test of knowledge - any swap of these four pairings would be wrong because each message has a single, distinct RFC-defined role.
Memory tip: Use the acronym OUNK - Open the door (negotiate), Update the map (routing info), Notification means "you're fired" (error + teardown), Keepalive is just a heartbeat - to lock in the order and function of all four message types.
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