Which of the following descriptions about dual-link backup is wrong? (Multiple choice)

Question

Options

• AThe establishment process of the main CAPWAP tunnel after the dual-link backup function is
• BWhen the AC with dual-link active-standby configuration and the AC without dual-link active-
• CCompared with hot backup, dual-link cold backup is to establish a backup CAPWAP tunnel to
• DCompared with cold backup, dual-link hot backup, CAPWAP tunnel fault detection is performed

• A
  72% (41)
• B
  28% (16)

Explanation

Options A, C, and D all contain incorrect statements about dual-link backup behavior in CAPWAP-based wireless networks.

Option A is wrong because the main CAPWAP tunnel establishment process is identical whether dual-link backup is enabled or not - the AP follows the standard CAPWAP discovery and join procedure regardless. Claiming the process changes with dual-link backup enabled is incorrect.

Option C is wrong because it mischaracterizes cold backup: in dual-link cold backup, the AP does establish a CAPWAP tunnel to the backup AC (it just remains in a standby/passive state). The distinction from hot backup is not whether a tunnel exists, but whether the backup AC actively synchronizes state and processes data.

Option D is wrong because dual-link hot backup does perform more active/frequent CAPWAP tunnel fault detection compared to cold backup - that is precisely one of its advantages. Saying otherwise inverts the actual behavior.

Option B is the only correct statement: it accurately describes the behavior when an AC with dual-link active-standby configuration interoperates with an AC that does not have that configuration (a real-world compatibility scenario).

Memory tip: Think "Cold = Connected but Calm, Hot = Heartbeating constantly." Cold backup has the tunnel but stays quiet; hot backup actively monitors and syncs - if an option flips those behaviors, it's wrong.

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