Question 1,144 of 2,152

BGP Troubleshooting →hardMultiple ChoiceObjective-mapped

300-410 BGP Troubleshooting Practice Question

This 300-410 practice question tests your understanding of bgp troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is troubleshooting a missing BGP route on R3. R3 has an eBGP session with R4 (AS 65004) and an iBGP session with R1 (AS 65003). R4 advertises a prefix 192.168.1.0/24 to R3, and R3's BGP table shows the route with next-hop 10.1.4.4. However, R3 does not install this route in its routing table. The output of 'show ip bgp 192.168.1.0/24' on R3 shows the route as valid but not best. 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: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 is not installed because the next-hop 10.1.4.4 is not reachable via any routing table entry.
Correct because BGP requires the next-hop to be reachable; otherwise, the route is not considered best.
B
The route is not installed because BGP synchronization is enabled and the IGP does not have the route.
Why wrong: Incorrect because synchronization is disabled by default in modern IOS and is rarely the cause.
C
The route is not installed because the prefix length is too long for the routing table.
Why wrong: Incorrect because BGP installs any prefix length unless filtered; this is not a typical issue.
D
The route is not installed because R3 has a higher administrative distance for eBGP routes.
Why wrong: Incorrect because eBGP routes have AD 20, which is lower than many IGPs; this would not prevent installation.

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 is not installed because the next-hop 10.1.4.4 is not reachable via any routing table entry.

For an eBGP route to be installed, the next-hop must be reachable via an IGP or static route. If the next-hop is not reachable, BGP marks the route as valid but not best.

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 is not installed because the next-hop 10.1.4.4 is not reachable via any routing table entry.
Why this is correct
Correct because BGP requires the next-hop to be reachable; otherwise, the route is not considered best.
Clue confirmation
The clue words "best", "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The route is not installed because BGP synchronization is enabled and the IGP does not have the route.
Why it's wrong here
Incorrect because synchronization is disabled by default in modern IOS and is rarely the cause.
✗
The route is not installed because the prefix length is too long for the routing table.
Why it's wrong here
Incorrect because BGP installs any prefix length unless filtered; this is not a typical issue.
✗
The route is not installed because R3 has a higher administrative distance for eBGP routes.
Why it's wrong here
Incorrect because eBGP routes have AD 20, which is lower than many IGPs; this would not prevent installation.

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?

BGP Troubleshooting — This question tests BGP Troubleshooting — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The route is not installed because the next-hop 10.1.4.4 is not reachable via any routing table entry. — For an eBGP route to be installed, the next-hop must be reachable via an IGP or static route. If the next-hop is not reachable, BGP marks the route as valid but not best.

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: "best", "most likely". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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