Question 1,731 of 2,152

Device Management →hardMultiple ChoiceObjective-mapped

300-410 Device Management Practice Question

This 300-410 practice question tests your understanding of device management. 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 iBGP between two routers in the same AS. The BGP table shows the prefix, but it is not installed in the routing table. The IGP does not carry the prefix. Which is the most likely explanation?

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.

A
The BGP synchronization rule is enabled, and the prefix is not in the IGP, so BGP does not install the route.
Synchronization requires that the prefix be reachable via IGP before BGP installs it; if not, the route remains in the BGP table but not the routing table.
B
The next-hop is unreachable because of a missing static route.
Why wrong: While next-hop reachability is required, the scenario specifically states the IGP does not carry the prefix, which is the synchronization issue.
C
The BGP route is filtered by an inbound route-map.
Why wrong: The route is in the BGP table, so it is not filtered.
D
The maximum-paths limit is exceeded.
Why wrong: Maximum-paths affects load balancing, not route 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 BGP synchronization rule is enabled, and the prefix is not in the IGP, so BGP does not install the route.

Option A is correct because when BGP synchronization is enabled (default in older IOS versions), BGP will not install a route learned via iBGP into the routing table unless the same prefix is also present in the IGP. Since the IGP does not carry the prefix, BGP considers the route unsynchronized and does not install it, even though it appears in the BGP table.

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 BGP synchronization rule is enabled, and the prefix is not in the IGP, so BGP does not install the route.
Why this is correct
Synchronization requires that the prefix be reachable via IGP before BGP installs it; if not, the route remains in the BGP table but not the routing table.
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 next-hop is unreachable because of a missing static route.
Why it's wrong here
While next-hop reachability is required, the scenario specifically states the IGP does not carry the prefix, which is the synchronization issue.
✗
The BGP route is filtered by an inbound route-map.
Why it's wrong here
The route is in the BGP table, so it is not filtered.
✗
The maximum-paths limit is exceeded.
Why it's wrong here
Maximum-paths affects load balancing, not route installation.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the BGP synchronization rule as a legacy behavior that candidates overlook, assuming that a prefix in the BGP table always implies installation in the routing table, but synchronization can block installation even when the next-hop is reachable.

Trap categories for this question

Scenario analysis trap
While next-hop reachability is required, the scenario specifically states the IGP does not carry the prefix, which is the synchronization issue.

Detailed technical explanation

How to think about this question

BGP synchronization (RFC 1771, deprecated in RFC 4271) was designed to prevent black-holing in transit ASes by ensuring that an iBGP-learned route is only used if the IGP also knows how to reach that prefix. In modern networks, synchronization is typically disabled (no synchronization) because full-mesh iBGP or route reflectors eliminate the need. The show ip bgp command displays the prefix, but the route is marked with a 's' (synchronized) flag if it is not installed due to synchronization.

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.

TExam Day Tips

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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 300-410 question test?

Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The BGP synchronization rule is enabled, and the prefix is not in the IGP, so BGP does not install the route. — Option A is correct because when BGP synchronization is enabled (default in older IOS versions), BGP will not install a route learned via iBGP into the routing table unless the same prefix is also present in the IGP. Since the IGP does not carry the prefix, BGP considers the route unsynchronized and does not install it, even though it appears in the BGP table.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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