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300-410 Practice Question: How does BFD prevent loops in a network where…

How does BFD prevent loops in a network where multiple BFD sessions might exist between the same pair of routers?

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

✓

By matching the Your Discriminator field against the local discriminator

BFD uses a mandatory Your Discriminator field in Control packets; a router will only accept a BFD Control packet if the Your Discriminator matches its own local discriminator, preventing misdirected packets from creating loops.

Answer analysis

Option-by-option breakdown

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

  • ✗

    By using TTL values to limit packet propagation

    Why it's wrong here

    TTL is not used for loop prevention in BFD; BFD is designed for single-hop or multihop sessions with explicit discriminator matching.

  • ✗

    By requiring authentication in all BFD packets

    Why it's wrong here

    Authentication provides security but does not prevent loops; it ensures packet integrity.

  • ✓

    By matching the Your Discriminator field against the local discriminator

    Why this is correct

    The Your Discriminator field must match the receiver's local discriminator for the packet to be accepted, preventing loops from misrouted packets.

  • ✗

    By using sequence numbers in BFD Control packets

    Why it's wrong here

    Sequence numbers are not used in BFD; the protocol relies on discriminator values for session identification.

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JA

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.