Which of the following is TRUE if the local state of BGP is OpenConfirm?

Question

Options

• AThe local system has received a Keepalive message and is ready to exchange updates.
• BThe local system is exchanging Update messages with its neighbor.
• CThe local system has sent a Keepalive message to its neighbor and is waiting to receive one back.
• DThe local system has sent an Open message to its neighbor and is waiting to receive one back.

• A
  3% (1)
• B
  3% (1)
• C
  93% (28)

Explanation

OpenConfirm is the BGP state entered after both peers have successfully exchanged Open messages and negotiated session parameters. At this point, the local router has sent a Keepalive to confirm acceptance of those parameters and is waiting for the neighbor's Keepalive in return - exactly what C describes. Once that Keepalive is received, the session advances to Established.

• A is wrong because receiving a Keepalive while in OpenConfirm triggers the transition to Established - it doesn't describe OpenConfirm itself, and "ready to exchange updates" belongs to Established.
• B is wrong because exchanging Update messages is what happens in the Established state, two steps later.
• D is wrong because waiting to receive an Open message back describes the OpenSent state, which comes before OpenConfirm.

Memory tip: Think of the BGP states in order - Idle → Connect → Active → OpenSent (sent Open, waiting for Open) → OpenConfirm (sent Keepalive, waiting for Keepalive) → Established. The state names hint at what was sent, not what was received - "OpenSent" sent an Open, "OpenConfirm" sent a Keepalive to confirm the Open exchange is complete.

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