H12-821_V1.0 · Question #720
Which of the following message types does BGP include? (Multiple choice)
The correct answer is A. Update C. Open D. Keepalive. BGP (Border Gateway Protocol) defines exactly four message types: Open, Update, Notification, and Keepalive. Open (C) initiates a BGP session between peers and negotiates parameters like AS number and hold timer. Update (A) is used to advertise new routes or withdraw previously…
Question
Options
- AUpdate
- BHello
- COpen
- DKeepalive
How the community answered
(46 responses)- A74% (34)
- B26% (12)
Explanation
BGP (Border Gateway Protocol) defines exactly four message types: Open, Update, Notification, and Keepalive. Open (C) initiates a BGP session between peers and negotiates parameters like AS number and hold timer. Update (A) is used to advertise new routes or withdraw previously announced ones - it's the core of BGP's routing function. Keepalive (D) is sent periodically to confirm a peer is still reachable and to prevent the hold timer from expiring.
Why B (Hello) is wrong: "Hello" messages belong to OSPF (and other link-state protocols), not BGP. It's a classic distractor that tests whether you're mixing up IGP and EGP protocol concepts.
Memory tip: Remember the acronym "OUNK" - Open, Update, Notification, Keepalive. These are all four BGP message types, and if "Hello" ever appears as a choice, it's always the OSPF imposter.
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