Which of the following descriptions about VRRP fast switching is wrong? (Multiple choice)

Question

Options

• AIf multiple BFDs are configured to monitor at the same time, each configuration is related to each other and may affect each other.
• BThe VRRP module proactively sends a master device priority lowering message and then immediately pre-empts, which improves the priority of the backup group.
• CWhen the monitored BFD session state recovers, the priority of the router in the backup group will be restored to original value
• DVRRP preemption requires that the BFD session has to be restored before VRRP preemption.

• A
  82% (42)
• B
  6% (3)
• D
  12% (6)

Explanation

A is wrong because multiple BFD sessions configured simultaneously for VRRP monitoring operate independently - one session's state change has no bearing on any other session, so the claim they "may affect each other" is false.

C is wrong because when a monitored BFD session recovers, the VRRP router's priority is not automatically restored to its original value; priority restoration depends on additional conditions such as preemption configuration, not merely BFD recovery alone.

B is correct (and therefore not a wrong description): in VRRP fast switching, the master proactively advertises a reduced priority when BFD detects a fault, triggering immediate preemption by the backup without waiting for the VRRP dead timer - this is the defining behavior of fast switching.

D is also correct: re-preemption back to master by the original high-priority router logically requires the BFD session (which caused the demotion) to be restored first, ensuring the underlying path is genuinely recovered before reconvergence.

Memory tip: Target the two "independence" errors - A falsely ties independent BFD sessions together, and C falsely ties priority recovery to BFD recovery alone. If a statement implies automatic coupling where none exists, it's likely wrong.

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