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300-410 Practice Question: In BFD multihop sessions, what is the default…

In BFD multihop sessions, what is the default value for the TTL (or hop limit) in outgoing BFD Control packets on Cisco IOS-XE?

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

✓

255

For BFD multihop sessions, Cisco IOS-XE defaults to a TTL of 255, as per RFC 5883, to ensure the packet can traverse multiple hops.

Answer analysis

Option-by-option breakdown

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

  • ✗

    1

    Why it's wrong here

    TTL 1 is used for single-hop BFD sessions to prevent packets from leaving the local link.

  • ✗

    64

    Why it's wrong here

    The multihop default TTL is 255, not 64; 64 is the typical initial TTL for host-generated IP packets. Configuring 64 would cause multihop BFD Control packets to expire before reaching distant peers across several routed hops.

  • ✗

    128

    Why it's wrong here

    128 is not the default; BFD multihop uses 255.

  • ✓

    255

    Why this is correct

    BFD multihop Control packets default to a TTL of 255 on Cisco IOS-XE, satisfying the stem's request for the default hop limit. This high value lets multihop sessions traverse multiple routed hops while remaining distinguishable from single-hop BFD, which uses TTL 254 for authentication and loop prevention.

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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.