The Hold time carried by BGP neighbor PeerA in Open is 90s, the Hold time carried by Peer in Open is 30s, and the time for PeerA and PeerB to send Keepalive messages after successful connection…

Question

Options

• A30s
• B90s
• CDo not send Keepalive messages
• D10s

• A
  7% (2)
• B
  18% (5)
• C
  4% (1)
• D
  71% (20)

Explanation

BGP negotiates the Hold Time by selecting the lower of the two values in the OPEN messages - here, min(90s, 30s) = 30s. The Keepalive interval is always one-third of the negotiated Hold Time, so 30 ÷ 3 = 10s, making D correct.

Option A (30s) is wrong because 30s is the negotiated Hold Time itself, not the Keepalive interval. Option B (90s) is wrong because it is PeerA's locally configured Hold Time, which is discarded in favor of the lower negotiated value. Option C is wrong because BGP peers must continuously send Keepalive messages to prevent the Hold Timer from expiring and tearing down the session.

Memory tip: "Take the lower Hold Time, divide by three - that is your Keepalive frequency."

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