mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ipv6 bgp summary
BGP router identifier 192.168.1.1, local AS number 65001 BGP table version is 10, main routing table version 10 5 network entries using 720 bytes of memory 5 path entries using 400 bytes of memory 3/2 BGP path/bestpath attribute entries using 456 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 BGP using 1600 total bytes of memory BGP activity 10/5 prefixes, 10/5 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
2001:DB8::2 4 65002 100 99 10 0 0 00:45:12 3
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the interpretation of the 'State/PfxRcd' column in 'show bgp ipv6 unicast summary' (or 'show ipv6 bgp summary'), where a numeric value indicates an established session and received prefixes, while a state name indicates a session problem, leading candidates to mistakenly think the session is down when they see a number instead of a state.
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
✓
BGP is peering over IPv6 and 3 prefixes are learned from the neighbor.
The output shows that the neighbor 2001:DB8::2 (IPv6 address) is in state '3' under 'State/PfxRcd', which indicates the BGP session is established and 3 IPv6 prefixes have been received from that neighbor. The 'Up/Down' time of 00:45:12 confirms the session is active, and the 'MsgRcvd/MsgSent' counters show bidirectional communication. Therefore, BGP is peering over IPv6 and has learned 3 prefixes from the neighbor, making option C correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BGP is not configured for IPv6.
Why it's wrong here
The neighbor is an IPv6 address and prefixes are received.
- ✗
The BGP session is down.
Why it's wrong here
The session is up with prefixes received.
- ✓
BGP is peering over IPv6 and 3 prefixes are learned from the neighbor.
Why this is correct
The neighbor is IPv6 and PfxRcd shows 3.
- ✗
The router is in AS 65002.
Why it's wrong here
Local AS is 65001.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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