Question 219 of 2,152

Bidirectional Forwarding Detection (BFD) →hardMultiple ChoiceObjective-mapped

300-410 Bidirectional Forwarding Detection (BFD) Practice Question

This 300-410 practice question tests your understanding of bidirectional forwarding detection (bfd). 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 engineer configures BFD for BGP on a route reflector client. The BFD session between the client and the route reflector is up, but the client does not receive routes from the route reflector. The engineer verifies that the BGP configuration is correct and that the client is sending routes. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1hardmultiple choice

Open the full BGP breakdown →

A
The route reflector is not configured with 'next-hop-self', so the client cannot reach the next hop of the routes.
Correct. Without 'next-hop-self', the route reflector advertises routes with the original next hop, which may not be reachable by the client.
B
The BFD session is using a different source IP than the BGP update-source, causing BGP to ignore BFD state.
Why wrong: Incorrect. A mismatch between BFD and BGP source IP would cause BFD to not track the BGP path, but the route reflector would still advertise routes.
C
The 'bgp client-to-client reflection' command is disabled on the route reflector.
Why wrong: Incorrect. Disabling client-to-client reflection would prevent routes from being reflected between clients, but the client would still receive routes from the route reflector if the route reflector is the only server.
D
The route reflector has a BGP policy that filters routes based on community, and the client's routes do not have the required community.
Why wrong: Incorrect. This would affect the routes sent to the route reflector, not the routes received from it.

Full breakdown with real-world context →

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

✓

The route reflector is not configured with 'next-hop-self', so the client cannot reach the next hop of the routes.

In a route reflector topology, the route reflector does not advertise routes learned from one client to another client unless the 'next-hop-self' command is configured. BFD does not affect this behavior. If the route reflector is not using 'next-hop-self', the client may not have a route to the next hop, causing the route to be hidden.

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.

✓
The route reflector is not configured with 'next-hop-self', so the client cannot reach the next hop of the routes.
Why this is correct
Correct. Without 'next-hop-self', the route reflector advertises routes with the original next hop, which may not be reachable by the client.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The BFD session is using a different source IP than the BGP update-source, causing BGP to ignore BFD state.
Why it's wrong here
Incorrect. A mismatch between BFD and BGP source IP would cause BFD to not track the BGP path, but the route reflector would still advertise routes.
✗
The 'bgp client-to-client reflection' command is disabled on the route reflector.
Why it's wrong here
Incorrect. Disabling client-to-client reflection would prevent routes from being reflected between clients, but the client would still receive routes from the route reflector if the route reflector is the only server.
✗
The route reflector has a BGP policy that filters routes based on community, and the client's routes do not have the required community.
Why it's wrong here
Incorrect. This would affect the routes sent to the route reflector, not the routes received from it.

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 300-410 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 300-410 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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FAQ

Questions learners often ask

What does this 300-410 question test?

Bidirectional Forwarding Detection (BFD) — This question tests Bidirectional Forwarding Detection (BFD) — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The route reflector is not configured with 'next-hop-self', so the client cannot reach the next hop of the routes. — In a route reflector topology, the route reflector does not advertise routes learned from one client to another client unless the 'next-hop-self' command is configured. BFD does not affect this behavior. If the route reflector is not using 'next-hop-self', the client may not have a route to the next hop, causing the route to be hidden.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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