Question 363 of 2,152

BGP Troubleshooting →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the VRF CUSTOMER has two routes, both learned via BGP from AS 65001. This is correct because the `show bgp vpnv4 vrf routes` command filters the BGP table to display only the VPNv4 prefixes associated with a specific VRF, and the output confirms that both 10.0.0.0/24 and 192.168.1.0/24 share the same route distinguisher (100:1) and next hop, with the `*> ` status indicating they are valid and best paths. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to interpret MPLS Layer 3 VPN route propagation, where a common trap is confusing the VRF-specific output with the global BGP table or misreading the AS_PATH as a local attribute. Remember that the route distinguisher (RD) uniquely identifies the VRF in the MPLS cloud, and the absence of an `i` (internal) flag means these are external routes from AS 65001. Memory tip: "VRF routes show the RD, not the RT" — focus on the RD line to confirm which VRF owns the prefixes.

300-410 BGP Troubleshooting Practice Question

This 300-410 practice question tests your understanding of bgp troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 troubleshoot a BGP Troubleshooting issue:

R1# show ip bgp vpnv4 vrf CUSTOMER routes

BGP table version is 10, local router ID is 1.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 100:1 (default for vrf CUSTOMER) *> 10.0.0.0/24 10.1.1.2 0 100 0 65001 i *> 192.168.1.0/24 10.1.1.2 0 100 0 65001 i

Total number of prefixes 2

What does this output indicate?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

Question 1hardmultiple choice

Open the full BGP breakdown →

A
The VRF CUSTOMER has two routes, both learned via BGP from AS 65001.
The output shows two prefixes with path AS 65001, valid and best in the VRF.
B
The VRF CUSTOMER is not receiving any routes because the RD is incorrect.
Why wrong: Routes are shown with RD 100:1, which is the default for the VRF.
C
The VRF CUSTOMER has two routes, but they are not installed in the routing table.
Why wrong: The '>' indicates best path, meaning they are installed.
D
The VRF CUSTOMER has two routes, but they are filtered by RT import policy.
Why wrong: The routes are shown, so they passed the RT import filter.

Full breakdown with real-world context →

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

✓

The VRF CUSTOMER has two routes, both learned via BGP from AS 65001.

The show ip bgp vpnv4 vrf CUSTOMER routes command displays BGP VPNv4 routes for a specific VRF. The output shows two routes with route distinguisher 100:1, received from AS 65001. These are the routes available in the VRF CUSTOMER.

Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The VRF CUSTOMER has two routes, both learned via BGP from AS 65001.
Why this is correct
The output shows two prefixes with path AS 65001, valid and best in the VRF.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
✗
The VRF CUSTOMER is not receiving any routes because the RD is incorrect.
Why it's wrong here
Routes are shown with RD 100:1, which is the default for the VRF.
✗
The VRF CUSTOMER has two routes, but they are not installed in the routing table.
Why it's wrong here
The '>' indicates best path, meaning they are installed.
✗
The VRF CUSTOMER has two routes, but they are filtered by RT import policy.
Why it's wrong here
The routes are shown, so they passed the RT import filter.

Common exam traps

Common exam trap: OSPF can fail even when IP connectivity looks correct

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
Routes are shown with RD 100:1, which is the default for the VRF.

Detailed technical explanation

How to think about this question

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.

KKey Concepts to Remember

OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.

TExam Day Tips

Check area mismatch first when OSPF adjacency fails.
Review passive interfaces when a network is advertised but no neighbour forms.
Use show ip ospf neighbor and show ip route clues carefully.

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

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

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.

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FAQ

Questions learners often ask

What does this 300-410 question test?

BGP Troubleshooting — This question tests BGP Troubleshooting — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: The VRF CUSTOMER has two routes, both learned via BGP from AS 65001. — The show ip bgp vpnv4 vrf CUSTOMER routes command displays BGP VPNv4 routes for a specific VRF. The output shows two routes with route distinguisher 100:1, received from AS 65001. These are the routes available in the VRF CUSTOMER.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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Last reviewed: Jun 18, 2026

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