H12-821_V1.0 · Question #932
BGP uses the () message to revoke routing entries.
The correct answer is A. update. BGP uses the Update message to both advertise new routes and withdraw (revoke) previously advertised ones - a single Update message can carry a list of withdrawn routes in its "Withdrawn Routes" field, making it the correct answer. The Notification message is used to report…
Question
Options
- Aupdate
- Bnotification
- Ckeepalive
- Dopen
How the community answered
(29 responses)- A83% (24)
- B3% (1)
- C7% (2)
- D7% (2)
Explanation
BGP uses the Update message to both advertise new routes and withdraw (revoke) previously advertised ones - a single Update message can carry a list of withdrawn routes in its "Withdrawn Routes" field, making it the correct answer. The Notification message is used to report errors and close a BGP session, not to revoke routes. Keepalive messages are simple heartbeats sent between peers to confirm the session is still active and carry no routing information. The Open message is only sent once at the start of a session to establish the BGP connection and negotiate parameters.
Memory tip: Think "Update = change" - BGP updates its neighbors whenever routing information changes, whether that means adding or removing routes.
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