What is the minimum number of seconds is the BGP peer adjacency relationship maintained?

Question

Options

• A120 seconds
• B60 seconds
• C10 seconds
• D180 seconds

• A
  8% (3)
• B
  5% (2)
• C
  3% (1)
• D
  85% (34)

Explanation

BGP peer adjacency is governed by the Hold Timer, which defaults to 180 seconds per RFC 4271 and standard implementations like Cisco IOS. If a BGP router does not receive a KEEPALIVE or UPDATE message from its peer within this 180-second window, it tears down the session and removes learned routes. Option B (60 seconds) is the default BGP KEEPALIVE interval - the interval at which routers send heartbeat messages, which is one-third of the hold time, not the hold time itself. Options A (120 seconds) and C (10 seconds) do not correspond to any standard BGP default timer values and are distractors. Memory tip: remember the 3-to-1 ratio - the hold time is 180 seconds and the keepalive fires every 60 seconds, so three missed keepalives triggers session teardown.

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