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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
64 is not the default; it is a common TTL for other protocols but not BFD multihop.
- ✗
128
Why it's wrong here
128 is not the default; BFD multihop uses 255.
- ✓
255
Why this is correct
The default TTL for BFD multihop sessions is 255, as per Cisco IOS-XE and RFC 5883.
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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.