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.
router bgp 65000
bgp router-id 10.0.0.1
neighbor 10.0.0.2 remote-as 65001
neighbor 10.0.0.2 route-map FILTER in
!
route-map FILTER deny 10
match ip address prefix-list BLOCKED
route-map FILTER permit 20
!
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
All routes from neighbor 10.0.0.2 are accepted except those matching 10.0.0.0/8.
The route-map FILTER is applied inbound from neighbor 10.0.0.2. Sequence 10 denies routes that match the prefix-list BLOCKED, which permits 10.0.0.0/8. Sequence 20 is a permit statement with no match, which implicitly permits all other routes. Therefore, only routes matching 10.0.0.0/8 are denied, and all other routes are accepted.
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.
✓
All routes from neighbor 10.0.0.2 are accepted except those matching 10.0.0.0/8.
Why this is correct
Correct. The deny statement blocks the specific prefix, and the permit allows everything else.
Related concept
Read the scenario before looking for a memorised answer.
✗
Only routes matching 10.0.0.0/8 are accepted from the neighbor.
Why it's wrong here
Incorrect. The first statement denies that prefix.
✗
The configuration is invalid because route-map must have a permit statement first.
Why it's wrong here
Incorrect. Route-maps can start with deny.
✗
The prefix-list is misconfigured because it should use 'deny' instead of 'permit'.
Why it's wrong here
Incorrect. The prefix-list permits the prefix for matching; the route-map then denies it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the interaction between route-map sequence numbers and the implicit deny at the end of a route-map, leading candidates to forget that a permit statement with no match (like sequence 20) is needed to allow all other routes through.
Detailed technical explanation
How to think about this question
In BGP, a route-map applied inbound with a deny statement filters routes before they enter the BGP table. The prefix-list BLOCKED uses 'permit' to specify the prefix to be matched; the route-map's deny action then drops those matched routes. This is a common pattern for selective prefix filtering, where the prefix-list acts as a match filter and the route-map decides the action. A subtle behavior is that if the route-map had no permit statement at the end, all unmatched routes would be implicitly denied.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
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: All routes from neighbor 10.0.0.2 are accepted except those matching 10.0.0.0/8. — The route-map FILTER is applied inbound from neighbor 10.0.0.2. Sequence 10 denies routes that match the prefix-list BLOCKED, which permits 10.0.0.0/8. Sequence 20 is a permit statement with no match, which implicitly permits all other routes. Therefore, only routes matching 10.0.0.0/8 are denied, and all other routes are accepted.
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.
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Question Discussion
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