Regarding the establishment process of the standby CAPWAP link, which of the following statements is correct? (Multiple choice)

Question

Options

• AThe AP and AC establish the primary tunnel and the backup tunnel at the same time and complete
• BThe AP sends a broadcast Discovery Request message to the standby AC
• CThe Join Request sent by the AP will carry a custom message type, telling the standby AC that the
• DWhen the AC receives the Join Request and obtains the custom message, it will skip the

• A
  21% (9)
• B
  9% (4)
• C
  70% (30)

Explanation

Options C and D are correct because they accurately describe how a standby CAPWAP link differs from a primary link during establishment. The AP includes a custom message type (element) in its Join Request to signal to the standby AC that this is a backup tunnel - not a new primary association. Recognizing this, the standby AC skips the normal configuration phases (such as firmware image download and configuration delivery), since the AP is already fully operational via its primary AC.

Why A is wrong: The primary and standby tunnels are established sequentially, not simultaneously. The primary CAPWAP tunnel must already be up before the AP initiates the standby tunnel setup.

Why B is wrong: The AP does not use a broadcast Discovery Request to find the standby AC. The standby AC address is either statically configured or provided by the primary AC, so the AP sends a unicast Discovery Request directly to the standby AC.

Memory tip: Think of the standby link as a "pre-approved shortcut" - the AP sends a special VIP pass (custom Join Request) so the standby AC knows to skip the usual onboarding steps and just keep the tunnel ready in the background.

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