Quick Answer
The correct answer is that BGP is peering over IPv6 and 3 prefixes are learned from the neighbor. This is confirmed by the `show ipv6 bgp summary` output, where the neighbor address `2001:DB8::2` is an IPv6 address, and the `State/PfxRcd` column shows a value of `3`, indicating the BGP session is established and three IPv6 prefixes have been received. The `Up/Down` time of 00:45:12 and the non-zero `MsgRcvd/MsgSent` counters further verify an active, bidirectional peering session over an IPv6 tunnel. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to interpret BGP summary output for IPv6 neighbor states, a common verification step when troubleshooting tunnel-based peering. A frequent trap is misreading the `State/PfxRcd` column—remember that a numeric value (like 3) means the session is up and prefixes are received, whereas a state like `Idle` or `Active` indicates a problem. Memory tip: “Number in PfxRcd means prefixes are received; a word means the session is dead.”
This 300-410 practice question tests your understanding of ipv6 tunneling techniques. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
BGP is not configured for IPv6.
Why wrong: The neighbor is an IPv6 address and prefixes are received.
The BGP session is down.
Why wrong: The session is up with prefixes received.
BGP is peering over IPv6 and 3 prefixes are learned from the neighbor.
The neighbor is IPv6 and PfxRcd shows 3.
The router is in AS 65002.
Why wrong: Local AS is 65001.
Answer choices
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Related concept
Read the scenario before looking for a memorised answer.
The router is in AS 65002.
Why it's wrong here
Local AS is 65001.
Common exam traps
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.
Detailed technical explanation
In IPv6 BGP, the 'State/PfxRcd' column in 'show ipv6 bgp summary' displays the number of prefixes received from the neighbor when the session is established; a numeric value (like 3) confirms the session is in the Established state, whereas a state name (like Idle, Active) would indicate a problem. The BGP table version (10) and the fact that the neighbor's TblVer matches (10) further confirm that the routes have been processed and synchronized. This command is critical for verifying IPv6 BGP peering in dual-stack or IPv6-only environments, where misconfigurations like missing 'neighbor activate' under the IPv6 address family are common.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
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FAQ
IPv6 Tunneling Techniques — This question tests IPv6 Tunneling Techniques — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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