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 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?
⚠ Common exam trap
Many candidates confuse a session that is up but receiving no prefixes with a session that is down; candidates might incorrectly assume the session is down because no routes are exchanged.
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 output shows that neighbor 10.2.2.2 has a State/PfxRcd value of 0, meaning the BGP session is established but no prefixes are being received from that neighbor. This could be due to inbound filtering, no routes to advertise, or other policy issues. The session is up (Up/Down timer is 00:08:21), so it's not down.
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
The PfxRcd column shows 0 for neighbour 10.2.2.2, meaning that session is established but receiving no prefixes, so the neighbours are not both exchanging routes. It is tempting because both sessions show Up/Down timers and zero queue counters, which superficially suggest healthy operation.
- ✗
Neighbor 10.1.1.2 is not sending any routes.
Why it's wrong here
The PfxRcd value of 2 against 10.1.1.2 shows that neighbour is actively advertising two prefixes, so it is sending routes. It is tempting because a zero in the InQ or OutQ column can suggest a stalled session, but those queues are empty here.
- ✓
Neighbor 10.2.2.2 is not sending any routes, possibly due to filtering or no routes to advertise.
Why this is correct
The State/PfxRcd column shows 0 prefixes received from 10.2.2.2, while the session is Established with counters incrementing. That means the neighbour advertises no routes, consistent with inbound filtering or an empty local table, not a down peering.
- ✗
The BGP session with 10.2.2.2 is down.
Why it's wrong here
State/PfxRcd showing 0 means the session reached Established but received no prefixes, not that it is down; a down session would display Idle, Active or Connect. It tempts because zero prefixes often accompanies a failed peer, yet here MsgRcvd and Up/Down confirm the TCP session is live.
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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
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