- A
BFD requires IS-IS to be configured with wide metrics.
Why wrong: BFD is independent of metric type.
- B
BFD can provide sub-second failure detection for IS-IS adjacencies.
BFD provides fast detection, typically less than 1 second.
- C
BFD can be used with both L1 and L2 adjacencies.
BFD supports all IS-IS adjacency types.
- D
IS-IS BFD configuration is done under the IS-IS router process.
Why wrong: BFD is configured under the interface, not the router process.
- E
BFD replaces the need for IS-IS hello packets.
Why wrong: BFD complements hellos; hellos are still needed for adjacency establishment.
Question 401 of 1,000
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An SP network is using IS-IS and wants to achieve fast convergence using BFD. Which two statements about BFD in IS-IS are correct?
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
✓
BFD can provide sub-second failure detection for IS-IS adjacencies.
BFD provides fast failure detection (sub-second) and is configured under the interface. IS-IS does not require BFD for normal operation; it's an enhancement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BFD requires IS-IS to be configured with wide metrics.
Why it's wrong here
BFD is independent of metric type.
- ✓
BFD can provide sub-second failure detection for IS-IS adjacencies.
Why this is correct
BFD provides fast detection, typically less than 1 second.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
BFD can be used with both L1 and L2 adjacencies.
Why this is correct
BFD supports all IS-IS adjacency types.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
IS-IS BFD configuration is done under the IS-IS router process.
Why it's wrong here
BFD is configured under the interface, not the router process.
- ✗
BFD replaces the need for IS-IS hello packets.
Why it's wrong here
BFD complements hellos; hellos are still needed for adjacency establishment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Networking — study guide chapter
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FAQ
Questions learners often ask
What does this 350-501 question test?
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: BFD can provide sub-second failure detection for IS-IS adjacencies. — BFD provides fast failure detection (sub-second) and is configured under the interface. IS-IS does not require BFD for normal operation; it's an enhancement.
What should I do if I get this 350-501 question wrong?
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 350-501 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 350-501 exam.
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