350-501 Architecture Practice Question
Exhibit
Refer to the exhibit. router bgp 65000 neighbor 10.0.0.1 remote-as 65001 neighbor 10.0.0.1 route-map SET-COMMUNITY out ! route-map SET-COMMUNITY permit 10 match ip address prefix-list CUSTOMER_PREFIXES set community 65000:100 65000:200 ! ip prefix-list CUSTOMER_PREFIXES seq 5 permit 192.168.0.0/24
Refer to the exhibit. A network engineer configures a BGP route-map to set communities on routes advertised to a neighbor. After applying the configuration, the engineer checks the BGP table on the neighbor router and does not see the communities. What is the most likely reason?
⚠ Common exam trap
Cisco often tests the fact that BGP attributes like communities are not sent by default, and candidates mistakenly focus on route-map logic or prefix matching rather than the explicit neighbor command required to propagate the attribute.
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 neighbor is missing the 'send-community' command
C is correct because BGP communities are not sent to a neighbor by default. Even if a route-map sets the community values correctly, the neighbor will not receive them unless the 'send-community' command is configured under the neighbor statement. This command enables the advertisement of the community attribute in BGP updates.
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 prefix-list does not match the exact prefix
Why it's wrong here
The prefix-list matches 192.168.0.0/24 exactly.
- ✗
The community values are not in the format 'AA:NN'
Why it's wrong here
The format 65000:100 is valid.
- ✓
The neighbor is missing the 'send-community' command
Why this is correct
Without 'send-community', communities are not advertised.
- ✗
The route-map needs to be applied inbound
Why it's wrong here
The route-map is applied outbound, which is correct for setting communities on outgoing updates.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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