mediumMultiple Choice
350-401 Practice Question: Runs the following command on Router R3: R3# show…
A network engineer runs the following command on Router R3:
R3# show bgp vpnv4 unicast all summary
BGP router identifier 10.0.0.3, local AS number 65000 BGP table version is 10, main routing table version 10 10 network entries using 1440 bytes of memory 10 path entries using 1360 bytes of memory 6/5 BGP path/bestpath attribute entries using 840 bytes of memory 4 BGP AS-PATH entries using 112 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 3752 total bytes of memory BGP activity 20/10 prefixes, 20/10 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 192.168.1.1 4 65000 1000 1000 10 0 0 01:23:45 5 192.168.2.2 4 65000 800 800 10 0 0 00:45:12 3
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the distinction between eBGP and iBGP by using the same AS number in the output, and candidates may overlook that the `vpnv4 unicast all` address family is specifically for MPLS VPN iBGP peering, not for standard IPv4 unicast.
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
✓
Both neighbors are iBGP peers exchanging VPNv4 prefixes
The command `show bgp vpnv4 unicast all summary` displays BGP VPNv4 unicast summary information for all VRFs. Both neighbors (192.168.1.1 and 192.168.2.2) are in the same AS 65000, and the output shows they are exchanging VPNv4 prefixes (State/PfxRcd shows 5 and 3 prefixes received). This confirms they are iBGP peers within the same AS, specifically for VPNv4 address family, which is used in MPLS Layer 3 VPN environments to carry customer VPN routes.
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 eBGP peers
Why it's wrong here
eBGP requires the two peers to belong to different autonomous systems. Here, the local AS is 65000 and both neighbors also show AS 65000, so they are in the same AS, which makes these iBGP sessions. Additionally, the VPNv4 address family is typically carried over iBGP within an MPLS L3VPN service provider network.
- ✓
Both neighbors are iBGP peers exchanging VPNv4 prefixes
Why this is correct
The output is from the IPv4 VPNv4 BGP table, and both neighbors are configured with the same AS number (65000) as the local router, which classifies them as iBGP peers. The PfxRcd column shows that each neighbor has sent 5 prefixes, meaning they are actively exchanging VPNv4 prefixes with this router. This is the correct interpretation of the 'show bgp vpnv4 unicast all' output.
- ✗
The neighbor 192.168.1.1 is not receiving any prefixes
Why it's wrong here
The PfxRcd counter for neighbor 192.168.1.1 displays 5, which is the number of prefixes received from that neighbor. A value of 5 indicates that this router has successfully received VPNv4 prefixes from 192.168.1.1, so the claim that it is not receiving any prefixes is incorrect. In contrast, a value of 0 would mean no prefixes are being received.
- ✗
The BGP table has 20 prefixes
Why it's wrong here
The BGP table shown in the output contains exactly 10 network entries, as seen in the 'Network' column. Each neighbor reports 5 prefixes received (PfxRcd = 5), and the total unique prefixes in the table is 10, not 20. The number 20 would be a simple doubling of the per-neighbor received count, but it does not reflect the actual table size.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.