In an N+1 backup scenario, the switchover between the primary and backup WACs is determined by the AP. By default, if the AP does not receive a CAPWAP heartbeat detection message from the primary…

Question

Options

• A180
• B150
• C90
• D75

• A
  4% (1)
• B
  79% (22)
• C
  14% (4)
• D
  4% (1)

Explanation

Option B (150 seconds) is the correct default CAPWAP echo interval threshold: if an AP fails to receive a heartbeat from its primary WAC within 150 seconds, it automatically initiates a switchover to the backup WAC in an N+1 redundancy configuration. Option A (180 seconds) is too long and does not match the default timer - using it would delay failover unnecessarily and is not the protocol default. Options C (90 seconds) and D (75 seconds) are too short and would cause premature failovers during brief network hiccups, making them incorrect and impractical as defaults. The logic behind 150 seconds is a balance: long enough to avoid false positives from transient packet loss, short enough to restore service quickly when the primary WAC truly fails.

Memory tip: Think "1-5-0 = one backup, five heartbeats missed at ~30s each" - 5 × 30 = 150. This anchors the number to the concept of "enough missed beats to be certain the primary is truly down."

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