mediumMultiple ChoiceObjective-mapped
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 summary
BGP router identifier 1.1.1.1, local AS number 65000 BGP table version is 15, main routing table version 15 2 network entries using 288 bytes of memory 2 path entries using 160 bytes of memory 2/2 BGP path/bestpath attribute entries using 296 bytes of memory 1 BGP AS-PATH entries using 24 bytes of memory 0 BGP route-map cache entries using 0 bytes of memory 0 BGP filter-list cache entries using 0 bytes of memory Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory BGP using 800 total bytes of memory BGP activity 6/0 prefixes, 6/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.1.1.2 4 65001 15 15 15 0 0 00:12:34 2 10.2.2.2 4 65002 10 12 15 0 0 00:08:21 0
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
✓
Neighbor 10.2.2.2 is not sending any routes, possibly due to filtering or no routes to advertise.
The show bgp summary output shows BGP neighbor states and prefix counts. Neighbor 10.1.1.2 is up and has sent 2 prefixes. Neighbor 10.2.2.2 is up but has sent 0 prefixes, indicating a possible issue with route advertisement or filtering.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Both neighbors are fully operational and exchanging routes.
Why it's wrong here
Neighbor 10.2.2.2 has 0 prefixes received, indicating a problem.
- ✗
Neighbor 10.1.1.2 is not sending any routes.
Why it's wrong here
Neighbor 10.1.1.2 has 2 prefixes received.
- ✓
Neighbor 10.2.2.2 is not sending any routes, possibly due to filtering or no routes to advertise.
Why this is correct
The PfxRcd column shows 0 for 10.2.2.2, meaning no prefixes are received from that neighbor.
- ✗
The BGP session with 10.2.2.2 is down.
Why it's wrong here
The state shows an Up/Down time, so the session is up.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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