- A
Routes received from 10.0.0.2 are tagged with community 100:200, but the community is not sent to other BGP peers unless send-community is configured.
Correct. The route-map sets the community on inbound updates, but without send-community, the community is not propagated.
- B
Routes received from 10.0.0.2 are tagged with community 100:200 and automatically sent to all neighbors.
Why wrong: Incorrect. Communities are not sent by default; send-community is required.
- C
The route-map is applied to outbound updates to 10.0.0.2, setting community on routes sent to that neighbor.
Why wrong: Incorrect. The 'in' keyword indicates the route-map is applied to inbound updates.
- D
The configuration is invalid because the community must be a string, not a numeric value.
Why wrong: Incorrect. Numeric communities in the format AA:NN are valid.
CCNP 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.
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 SET_COMMUNITY in
! route-map SET_COMMUNITY permit 10 set community 100:200 ! What is the effect of this configuration?
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
Routes received from 10.0.0.2 are tagged with community 100:200, but the community is not sent to other BGP peers unless send-community is configured.
The route-map SET_COMMUNITY is applied to inbound updates from neighbor 10.0.0.2, so routes received from that neighbor are tagged with community 100:200. However, BGP does not propagate communities to other peers unless the neighbor is explicitly configured with the send-community command. Without send-community, the community attribute is stripped from outbound updates, so the community is not sent to other BGP peers.
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.
- ✓
Routes received from 10.0.0.2 are tagged with community 100:200, but the community is not sent to other BGP peers unless send-community is configured.
Why this is correct
Correct. The route-map sets the community on inbound updates, but without send-community, the community is not propagated.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Routes received from 10.0.0.2 are tagged with community 100:200 and automatically sent to all neighbors.
Why it's wrong here
Incorrect. Communities are not sent by default; send-community is required.
- ✗
The route-map is applied to outbound updates to 10.0.0.2, setting community on routes sent to that neighbor.
Why it's wrong here
Incorrect. The 'in' keyword indicates the route-map is applied to inbound updates.
- ✗
The configuration is invalid because the community must be a string, not a numeric value.
Why it's wrong here
Incorrect. Numeric communities in the format AA:NN are valid.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between inbound and outbound route-map application, and the fact that communities are not automatically sent to peers without explicit send-community configuration, leading candidates to assume the community is propagated by default.
Trap categories for this question
Keyword trap
Incorrect. The 'in' keyword indicates the route-map is applied to inbound updates.
Detailed technical explanation
How to think about this question
BGP communities are transitive optional attributes that can be used for tagging and policy control across autonomous systems. The community attribute is not propagated by default; the neighbor send-community (or send-community extended) command must be configured to include the community in updates to that peer. This behavior is defined in RFC 1997 and is a common source of misconfiguration when implementing community-based routing policies in multi-AS environments.
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
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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: Routes received from 10.0.0.2 are tagged with community 100:200, but the community is not sent to other BGP peers unless send-community is configured. — The route-map SET_COMMUNITY is applied to inbound updates from neighbor 10.0.0.2, so routes received from that neighbor are tagged with community 100:200. However, BGP does not propagate communities to other peers unless the neighbor is explicitly configured with the send-community command. Without send-community, the community attribute is stripped from outbound updates, so the community is not sent to other BGP peers.
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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Last reviewed: Jun 24, 2026
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