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300-410 Practice Question: Consider the following BGP configuration with…

Consider the following BGP configuration with BFD:

router bgp 65000
 neighbor 10.1.1.2 remote-as 65001
 neighbor 10.1.1.2 fall-over bfd

!

interface GigabitEthernet0/0
 ip address 10.1.1.1 255.255.255.252

bfd interval 200 min_rx 200 multiplier 4 !

What is the effect of the 'neighbor fall-over bfd' command?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

BGP will use BFD for fast failure detection; if BFD goes down, BGP will reset the session immediately.

The 'neighbor fall-over bfd' command enables BGP to use BFD for fast failure detection. When BFD detects a failure, BGP will immediately tear down the peering session without waiting for the hold timer.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    BGP will use BFD to detect link failures, but the BGP hold timer still applies.

    Why it's wrong here

    When BFD is used, BGP bypasses the hold timer and reacts immediately to BFD down events.

  • ✗

    BGP will ignore the BFD session and continue using its own keepalive/hold mechanism.

    Why it's wrong here

    The 'fall-over bfd' command specifically tells BGP to use BFD.

  • ✓

    BGP will use BFD for fast failure detection; if BFD goes down, BGP will reset the session immediately.

    Why this is correct

    Correct. BGP registers with BFD and upon BFD session failure, BGP tears down the neighbor without waiting for the hold timer.

  • ✗

    The 'fall-over bfd' command is only needed if BFD timers are less than 100 ms.

    Why it's wrong here

    The command is independent of timer values; it enables BFD integration.

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Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.