Match the events with the corresponding states/actions in the Master/Backup initialization process as depicted in the diagram.

Question

Options

• AThe event 'Is received and the priority is less than 255' maps to state '2'; 'The MASTER DOTN timer times out or a message is received with a higher priority of 0 or a message with a priority lower than the local priority' maps to state '6'; 'Receive Startup with priority equal to 255' maps to state '3'; 'Receive Shut down message' maps to state '4'; 'Receive a message with a higher priority than the local one' maps to state '5'.
• B
• C
• D

• A
  79% (34)
• B
  7% (3)
• C
  12% (5)
• D
  2% (1)

Explanation

Option A is correct because it accurately reflects the event-to-state/action mappings defined in the VRRP (Virtual Router Redundancy Protocol) Master/Backup initialization state machine, where each event triggers a specific transition: a received advertisement with priority below 255 moves the router into a backup holding state (2), a startup event with priority 255 bypasses backup and enters the master role directly (3), a shutdown event leads to a graceful exit (4), receiving a higher-priority advertisement causes demotion to backup (5), and the MASTER DOWN timer expiring or receiving a zero-priority or lower-priority message triggers promotion to master (6). Options B, C, and D are blank and therefore present no valid alternative mapping, making A the only complete and substantive answer. The mappings in A align precisely with the VRRP RFC state machine logic, where priority 255 signals IP address ownership and always bypasses the backup state.

Memory tip: Think of priority 255 as a VIP pass - it skips the line and goes straight to Master. Any router without that VIP status must wait in the Backup state and only becomes Master when the current Master goes silent (MASTER DOWN timer) or steps aside (priority 0 in a received message).

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