To ensure the reliability of WLAN networking, two ACs of the same model are currently in the same computer room, and if a failure occurs between the primary and secondary ACs, the switchover can be…

Question

Options

• ADual-link hot backup
• BDual-link cold backup
• CVRRP+single-machine hot standby
• DN+1 backup

• A
  4% (1)
• B
  7% (2)
• C
  78% (21)
• D
  11% (3)

Explanation

VRRP combined with single-machine hot standby is the correct choice because it provides real-time configuration and session synchronization between the two ACs, meaning the standby AC is always up-to-date and can take over immediately when the primary fails - achieving the fastest possible switchover with minimal service disruption. Option A (dual-link hot backup) involves APs maintaining simultaneous connections to both ACs across two separate physical links, which is a different redundancy model suited for AP-to-AC link redundancy, not the AC-to-AC failover scenario described here. Option B (dual-link cold backup) fails the speed requirement because the backup AC is not kept synchronized in real-time, so it must be brought online and reconfigured during a failure, causing significant delay. Option D (N+1 backup) is designed for environments where one spare AC covers multiple primary ACs, making it a poor fit when there are only two ACs in a one-to-one primary/secondary relationship.

Memory tip: "VRRP holds the virtual IP steady while hot standby keeps the backup warm - same room, same model, fastest failover."

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