mediumMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot a BGP…
A network engineer runs the following command to troubleshoot a BGP Troubleshooting issue:
R1# show bgp ipv4 unicast 192.168.1.0/24
BGP routing table entry for 192.168.1.0/24, version 12 Paths: (1 available, best #1, table default) Advertised to update-groups: 1 Refresh Epoch 1 65001, (received & used)
10.1.1.2 from 10.1.1.2 (10.1.1.2)
Origin IGP, metric 0, localpref 100, valid, external, best Community: 100:200
What does this output indicate?
⚠ Common exam trap
The trap here is assuming that any displayed attribute implies a filtering or forwarding action; candidates must distinguish a route that is merely tagged with a community from one that is actually being filtered or rejected by a community-based policy.
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 192.168.1.0/24 has a community attribute of 100:200, which may affect routing decisions.
The output line 'Community: 100:200' confirms that the prefix 192.168.1.0/24 carries the BGP community attribute 100:200. Communities are transitive optional attributes used to tag routes so that route-maps and policies on this or downstream routers can match them and influence selection, filtering, or propagation. The route is also marked 'valid, external, best', so it is installed and usable — the community is simply metadata that may drive routing decisions.
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 192.168.1.0/24 has a community attribute of 100:200, which may affect routing decisions.
Why this is correct
The output lists Community: 100:200 on the single external path, confirming the prefix carries that community attribute. Communities can influence routing decisions through matching route-maps or policies, so the statement correctly identifies the attribute present in this BGP table entry.
- ✗
The prefix 192.168.1.0/24 is not installed in the routing table.
Why it's wrong here
The output shows "best" and "received & used", meaning the path was selected and installed in the RIB, so the prefix is present. It tempts because a missing route is a common BGP fault, and this would be correct if the entry showed only "valid" without "best" or "used".
- ✗
The prefix 192.168.1.0/24 is being filtered due to the community value.
Why it's wrong here
The path carries community 100:200 yet is marked valid, external and best, so no filter blocked it; filtering would remove the path or mark it invalid. It tempts because community-based filtering is common, and this would be correct if the route were absent or flagged filtered.
- ✗
The community 100:200 indicates the prefix is from a confederation.
Why it's wrong here
Community 100:200 is a standard transitive value; confederation identifiers appear as AS_CONFED_SEQUENCE or AS_CONFED_SET in the AS path, not as a community. It tempts because confederations use AS numbers, and this would be correct if the path showed confederation segments.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.