- A
Apply a distribute list under the BGP neighbor configuration for ISP-A.
Correct because a distribute list with a prefix list can filter incoming routes based on prefix, allowing only specific prefixes.
- B
Configure a network statement under BGP for the desired prefixes.
Why wrong: Incorrect because network statements are used to advertise routes into BGP, not to filter incoming routes.
- C
Use the default-information originate command under BGP.
Why wrong: Incorrect because this command is used to generate a default route, not to filter incoming prefixes.
- D
Apply a route map to the neighbor using the route-map command in the inbound direction.
Why wrong: Incorrect because while a route map can filter, the scenario specifically mentions prefix-based filtering; a distribute list is more direct and simpler for this task.
350-401 BGP Practice Question
This 350-401 practice question tests your understanding of bgp. 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.
A network engineer is configuring BGP on a Cisco router that is part of an enterprise network with multiple BGP peers. The router receives routes from two different ISPs. The engineer wants to ensure that only specific prefixes from ISP-A are installed in the routing table, while all other routes from ISP-A are ignored. Additionally, the engineer wants to accept all routes from ISP-B. Which BGP feature should be used on the router for the peering with ISP-A?
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
Apply a distribute list under the BGP neighbor configuration for ISP-A.
A distribute list applied under the BGP neighbor configuration for ISP-A allows the engineer to filter specific prefixes using an access list or prefix list, ensuring only the desired prefixes are installed in the routing table while all others from ISP-A are ignored. This is the correct tool for inbound route filtering on a per-neighbor basis, as it directly controls which routes are accepted into the BGP table and subsequently the routing 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.
- ✓
Apply a distribute list under the BGP neighbor configuration for ISP-A.
Why this is correct
Correct because a distribute list with a prefix list can filter incoming routes based on prefix, allowing only specific prefixes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a network statement under BGP for the desired prefixes.
Why it's wrong here
Incorrect because network statements are used to advertise routes into BGP, not to filter incoming routes.
- ✗
Use the default-information originate command under BGP.
Why it's wrong here
Incorrect because this command is used to generate a default route, not to filter incoming prefixes.
- ✗
Apply a route map to the neighbor using the route-map command in the inbound direction.
Why it's wrong here
Incorrect because while a route map can filter, the scenario specifically mentions prefix-based filtering; a distribute list is more direct and simpler for this task.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between filtering incoming routes (distribute list or route map) versus originating routes (network statement) or generating defaults (default-information originate), leading candidates to confuse route map with distribute list when both can filter, but the question explicitly asks for the feature that 'should be used' and distribute list is the precise answer for prefix-only filtering without attribute manipulation.
Trap categories for this question
Command / output trap
Incorrect because this command is used to generate a default route, not to filter incoming prefixes.
Scenario analysis trap
Incorrect because while a route map can filter, the scenario specifically mentions prefix-based filtering; a distribute list is more direct and simpler for this task.
Detailed technical explanation
How to think about this question
A distribute list under BGP neighbor configuration uses an access list or prefix list to filter incoming or outgoing BGP updates at the router level, affecting which routes are installed in the BGP table and subsequently the routing table. This is implemented via the 'neighbor X.X.X.X distribute-list [acl|prefix-list] in' command, which operates before BGP best-path selection, ensuring only matched prefixes are considered. In real-world scenarios, this is commonly used to enforce routing policies like accepting only specific customer prefixes from a transit provider while discarding others to prevent route leaks or unwanted traffic.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 350-401 question test?
BGP — This question tests BGP — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Apply a distribute list under the BGP neighbor configuration for ISP-A. — A distribute list applied under the BGP neighbor configuration for ISP-A allows the engineer to filter specific prefixes using an access list or prefix list, ensuring only the desired prefixes are installed in the routing table while all others from ISP-A are ignored. This is the correct tool for inbound route filtering on a per-neighbor basis, as it directly controls which routes are accepted into the BGP table and subsequently the routing table.
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 24, 2026
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