When configuring dual-link hot backup, the engineer configures the CAPWAP heartbeat detection interval to be 20 seconds, and enables the dual-link backup function. Then the time when the AP detects…

Question

Options

• A20 seconds
• B60 seconds
• C75 seconds
• D90 seconds

• A
  9% (3)
• B
  86% (30)
• C
  3% (1)
• D
  3% (1)

Explanation

Option B (60 seconds) is correct because CAPWAP uses a default retry count of 3 consecutive missed heartbeats before declaring the primary link dead. With a 20-second heartbeat interval, the AP must miss 3 heartbeats before triggering the active-standby switchover: 3 × 20 = 60 seconds.

Why the distractors are wrong:

• A (20 seconds): This is just one heartbeat interval - a single missed heartbeat doesn't trigger a switchover; the AP waits for 3 consecutive failures.
• C (75 seconds): This would imply a non-standard multiplier of 3.75×, which doesn't correspond to any CAPWAP default behavior.
• D (90 seconds): This would require 4.5 missed heartbeats, also a non-standard value; it conflates the retry threshold with a different default setting.

Memory tip: Think of it as the "3-strike rule" - CAPWAP gives the primary AC 3 chances (retries) before switching over, so multiply the heartbeat interval by 3 to get the failover time (20s × 3 = 60s).

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