Question 188 of 2,011
mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a route filtering issue:
R1# debug ip bgp updates
BGP(0): 10.1.1.2 rcvd UPDATE w/ attr: nexthop 10.1.1.2, origin i, metric 0, path 65001 65002 BGP(0): 10.1.1.2 rcvd UPDATE about 192.168.100.0/24 -- DENIED due to: community no-export;
What does this output indicate?
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 prefix 192.168.100.0/24 is denied because of the no-export community.
The debug output shows that BGP received an update for prefix 192.168.100.0/24 from neighbor 10.1.1.2, but the update was denied because the prefix has the community 'no-export'. This indicates that an inbound route-map or filter is configured to deny routes with the no-export community.
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 192.168.100.0/24 is being accepted and installed in the BGP table.
Why it's wrong here
The output clearly states 'DENIED due to: community no-export', so the route is not accepted.
- ✓
The prefix 192.168.100.0/24 is denied because of the no-export community.
Why this is correct
The debug output explicitly shows that the update is denied due to the no-export community.
- ✗
The prefix 192.168.100.0/24 is denied because of an AS_PATH filter.
Why it's wrong here
The denial reason is community no-export, not AS_PATH.
- ✗
The prefix 192.168.100.0/24 is accepted but not advertised to any neighbor.
Why it's wrong here
The route is denied and not installed in the BGP table.
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Same concept, more angles
1 more way this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command to verify BGP route filtering: R1# show bgp ipv4 unicast 192.168.1.0/24 BGP routing table entry for 192.168.1.0/24, version 2 Paths: (1 available, best #1, table default) Advertised to update-groups: 1 Refresh Epoch 1 Local, (received & used) 10.1.1.2 (metric 20) from 10.1.1.2 (2.2.2.2) Origin IGP, metric 0, localpref 100, valid, internal, best rx pathid: 0, tx pathid: 0x0 Community: no-export What does the 'Community: no-export' indicate?
easy- A.The route will not be advertised to any iBGP peers.
- ✓ B.The route will not be advertised to any eBGP peers.
- C.The route is filtered by an inbound route-map.
- D.The route is not installed in the routing table.
Why B: The community 'no-export' indicates that this route should not be advertised to any eBGP peers. This is a well-known community that controls route propagation.
Last reviewed: Jun 18, 2026
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