Quick Answer
The answer is that the VRF has 23 total routes, not 18. This is because the "show ip route vrf summary" command counts both networks and subnets separately, so you must add the 18 networks and 5 subnets together to get the full route count of 23. On the Cisco CCNP ENARSI 300-410 exam, this command is used to quickly verify MPLS L3VPN operation by checking the route distribution across sources like connected, static, OSPF, and BGP, with BGP often being the primary source for VPNv4 prefixes. A common trap is to only look at the "Networks" column and ignore the "Subnets" column, leading to an undercount. Remember the memory tip: "Networks plus Subnets equals Total routes" — always sum both columns to get the accurate VRF route count.
This 300-410 practice question tests your understanding of mpls l3vpn. 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 to verify MPLS L3VPN operation:
R1# show ip route vrf CUSTOMER-A summary
Output: Route Source Networks Subnets Overhead Memory (bytes) connected 2 0 48 288 static 1 0 24 144 ospf 100 5 2 168 1008 bgp 65000 10 3 312 1872 External: 10, Internal: 0, Local: 0 Total 18 5 552 3312
What does this output indicate?
The VRF has 23 total routes
18 networks + 5 subnets = 23 total routes.
The VRF has 10 BGP routes
Why wrong: BGP has 10 networks and 3 subnets, so 13 total BGP routes.
The VRF is using OSPF as the only IGP
Why wrong: OSPF is present, but also connected, static, and BGP.
The VRF has no external BGP routes
Why wrong: The output shows External: 10, so there are external routes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The VRF has 23 total routes
The show ip route vrf summary command provides a summary of routes in the VRF. It shows the number of networks and subnets from each routing source, along with overhead and memory usage. For BGP, it also breaks down external vs internal routes. This output indicates the VRF has 18 networks and 5 subnets total, with BGP as the primary source.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The VRF has 23 total routes
Why this is correct
18 networks + 5 subnets = 23 total routes.
Related concept
OSPF neighbours must agree on key parameters.
The VRF has 10 BGP routes
Why it's wrong here
BGP has 10 networks and 3 subnets, so 13 total BGP routes.
The VRF is using OSPF as the only IGP
The VRF has no external BGP routes
Why it's wrong here
The output shows External: 10, so there are external routes.
Common exam traps
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
The output shows External: 10, so there are external routes.
Detailed technical explanation
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
MPLS L3VPN — study guide chapter
Learn the concepts, then practise the questions
MPLS L3VPN practice questions
Targeted practice on this topic area only
All 300-410 questions
2,152 questions across all exam domains
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise 300-410 questions linked to Layer 3 Technologies.
Practise 300-410 questions linked to EIGRP Troubleshooting.
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
Practise 300-410 questions linked to BGP Troubleshooting.
Practise 300-410 questions linked to Route Redistribution.
Practise 300-410 questions linked to Policy-Based Routing (PBR).
Practise 300-410 questions linked to VRF-Lite.
Practise 300-410 questions linked to Route Maps and Route Filtering.
Practise 300-410 questions linked to Administrative Distance.
Practise 300-410 questions linked to Route Summarization.
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
MPLS L3VPN — This question tests MPLS L3VPN — OSPF neighbours must agree on key parameters..
The correct answer is: The VRF has 23 total routes — The show ip route vrf summary command provides a summary of routes in the VRF. It shows the number of networks and subnets from each routing source, along with overhead and memory usage. For BGP, it also breaks down external vs internal routes. This output indicates the VRF has 18 networks and 5 subnets total, with BGP as the primary source.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
OSPF neighbours must agree on key parameters.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 18, 2026
This 300-410 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 300-410 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.