Which of the following descriptions about the VRRP Backup device are correct? (Multiple choice) A. Backup will discard IP packets whose destination MAC address is the virtual MAC address. B. Backup…

Question

Options

• ABackup will discard IP packets whose destination MAC address is the virtual MAC address.
• BBackup will respond to IP packets whose destination IP address is the virtual IP address.
• CWhen Backup receives the VRRP message by Master, it can determine whether the status of Master is normal.
• DWhen receiving a VRRP message with priority 0, Backup waits for Skew_time and then directly switches to Master.

• A
  74% (25)
• B
  26% (9)

Explanation

In VRRP, the Backup device plays a passive, monitoring role - it never forwards traffic for the virtual address while the Master is active. A is correct because only the Master processes frames destined to the virtual MAC; the Backup discards them to avoid duplicate handling and routing conflicts. C is correct because the Backup continuously monitors VRRP advertisement messages from the Master - if advertisements arrive on time and with the expected priority, the Master is healthy; if they stop (Master_Down_Interval expires), the Backup initiates a takeover. D is correct because a priority-0 advertisement is the Master's explicit "I'm stepping down" signal; upon receiving it, the Backup skips the full Master_Down_Interval and waits only the shorter Skew_time before promoting itself, enabling fast graceful failover.

B is wrong because responding to packets for the virtual IP is exclusively the Master's job - if the Backup responded too, hosts would receive duplicate replies and the redundancy scheme would break. The Backup stays silent on the data plane until it becomes Master.

Memory tip: Think of Backup as a silent understudy - it watches the performance (monitors VRRP hellos), ignores the spotlight (discards virtual MAC frames, never answers virtual IP traffic), but rushes on stage immediately when the lead actor sends the "I quit" signal (priority 0 → Skew_time → Master).

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