Which of the following statements about the three backup methods is correct? (Multiple choice)

Question

Options

• ADual-link hot backup: backup AP and STA information at the same time, backup CAPWAP link
• BVRRP hot backup: backup AP and STA information at the same time, backup CAPWAP link
• CRegardless of cold backup or hot backup, a backup AC can only provide backup for a primary AC
• DDual-link backup is a cold backup, and STA information is not backed up. The AP establishes two

• A
  16% (6)
• B
  78% (29)
• C
  5% (2)

Explanation

B is correct because VRRP hot backup uses a shared virtual IP between the primary and backup AC, allowing the CAPWAP tunnel to survive failover transparently - the APs never see the IP change - and the backup AC continuously synchronizes both AP and STA session information in real time. D is correct because dual-link backup has each AP maintain simultaneous CAPWAP tunnels to both the primary and backup AC, which speeds up failover, but it is classified as cold backup because STA information is not synchronized between ACs.

A is wrong because dual-link backup is cold, not hot - it does not synchronize STA information, making the "hot backup" label in option A false. C is wrong because a backup AC can serve multiple primary ACs in N+1 redundancy scenarios, so "only one primary" is too restrictive a claim.

Memory tip: Link "VRRP = Virtual IP = tunnel survives = everything hot (AP + STA + CAPWAP)." For dual-link, think "two cables, cold fridge" - the AP has two connections ready, but STA data is never stored on the backup side.

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