Question 256 of 2,015

VRF and Path Isolation →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct conclusion is that the route 192.168.1.0/24 is installed in the VRF routing table from BGP. This is confirmed by combining the outputs of both commands: the `show ip route vrf CUSTOMER-D` reveals a `B` code for the prefix with an administrative distance of 200, indicating an iBGP-learned route, while the `show ip bgp vpnv4 vrf CUSTOMER-D` output shows the same prefix marked with `*>`, meaning it is both valid and the best path in the BGP table. On the ENCOR 350-401 exam, this scenario tests your ability to verify BGP VPNv4 routes in VRF routing table by cross-referencing the routing table with the BGP table—a critical skill for troubleshooting MPLS Layer 3 VPNs. A common trap is assuming a route is installed just because it appears in BGP; you must check for the `B` code in the VRF routing table to confirm actual installation. Memory tip: think of `show ip route vrf` as the "final destination" and `show ip bgp vpnv4 vrf` as the "candidate list"—only routes with the `B` code in the first command have made the trip.

350-401 VRF and Path Isolation Practice Question

This 350-401 practice question tests your understanding of vrf and path isolation. 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 R6:

R6# show ip route vrf CUSTOMER-D

VRF CUSTOMER-D:

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.0.0.0/30 is directly connected, GigabitEthernet0/0.400
L        10.0.0.1/32 is directly connected, GigabitEthernet0/0.400
      192.168.0.0/16 is variably subnetted, 1 subnets, 1 mask
B        192.168.1.0/24 [200/0] via 10.0.0.2, 00:10:00

R6# show ip bgp vpnv4 vrf CUSTOMER-D

BGP table version is 5, local router ID is 10.0.0.6 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 *> 192.168.1.0/24 10.0.0.2 0 100 0 i

Based on this output, what can be concluded?

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 route 192.168.1.0/24 is learned via OSPF
Why wrong: Both outputs show it is BGP (B and BGP table).
B
The route 192.168.1.0/24 is installed in the VRF routing table from BGP
The VRF route shows B, and the BGP table shows the same prefix with next-hop 10.0.0.2.
C
The next-hop 10.0.0.2 is not reachable
Why wrong: The route is valid and best (*>), indicating reachability.
D
VRF CUSTOMER-D has no directly connected networks
Why wrong: There is a directly connected network 10.0.0.0/30.

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 route 192.168.1.0/24 is installed in the VRF routing table from BGP

The show ip bgp vpnv4 vrf CUSTOMER-D output displays a BGP route for 192.168.1.0/24 with the '> ' (best) marker, and the show ip route vrf CUSTOMER-D output shows this route with a 'B' code (BGP). This confirms the route is learned via BGP and installed in the VRF routing table. The administrative distance of 200 in the routing table entry further confirms it is a BGP route (eBGP default AD is 20, but iBGP is 200; the [200/0] indicates iBGP).

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 route 192.168.1.0/24 is learned via OSPF
Why it's wrong here
Both outputs show it is BGP (B and BGP table).
✓
The route 192.168.1.0/24 is installed in the VRF routing table from BGP
Why this is correct
The VRF route shows B, and the BGP table shows the same prefix with next-hop 10.0.0.2.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The next-hop 10.0.0.2 is not reachable
Why it's wrong here
The route is valid and best (*>), indicating reachability.
✗
VRF CUSTOMER-D has no directly connected networks
Why it's wrong here
There is a directly connected network 10.0.0.0/30.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between the routing table (show ip route) and the BGP table (show ip bgp), where a route can be present in BGP but not installed in the routing table if the next-hop is unreachable, but here the route is installed, confirming reachability.

Trap categories for this question

Command / output trap
Both outputs show it is BGP (B and BGP table).

Detailed technical explanation

How to think about this question

In MPLS L3VPN, VRF routes are typically learned via MP-BGP (VPNv4) between PE routers, and the show ip bgp vpnv4 vrf command filters the BGP table for a specific VRF. The route's administrative distance of 200 indicates it was learned via iBGP (default AD 200), while eBGP routes would show AD 20. The next-hop 10.0.0.2 must be reachable via the VRF's global or VRF-specific routing table for the route to be installed; here, it is reachable via the directly connected /30 link.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

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

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 350-401 question test?

VRF and Path Isolation — This question tests VRF and Path Isolation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The route 192.168.1.0/24 is installed in the VRF routing table from BGP — The show ip bgp vpnv4 vrf CUSTOMER-D output displays a BGP route for 192.168.1.0/24 with the '> ' (best) marker, and the show ip route vrf CUSTOMER-D output shows this route with a 'B' code (BGP). This confirms the route is learned via BGP and installed in the VRF routing table. The administrative distance of 200 in the routing table entry further confirms it is a BGP route (eBGP default AD is 20, but iBGP is 200; the [200/0] indicates iBGP).

What should I do if I get this 350-401 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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Same concept, more angles

1 more ways this is tested on 350-401

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A network engineer runs the following command on Router R1: R1# show ip route vrf CUSTOMER-A VRF CUSTOMER-A: Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is 10.0.1.1 to network 0.0.0.0 10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks C 10.0.0.0/30 is directly connected, GigabitEthernet0/0.100 L 10.0.0.1/32 is directly connected, GigabitEthernet0/0.100 B 10.0.2.0/24 [200/0] via 192.168.1.2, 00:12:34 Based on this output, what can be concluded?

medium

✓ A.VRF CUSTOMER-A has a BGP-learned route to 10.0.2.0/24
B.VRF CUSTOMER-A is not using BGP for routing
C.The default route is learned via BGP
D.GigabitEthernet0/0.100 is not associated with VRF CUSTOMER-A

Why A: The output shows a BGP-learned route to 10.0.2.0/24 with the code 'B' and the administrative distance [200/0], indicating it is an external BGP route. The route is installed in the VRF CUSTOMER-A routing table, confirming that VRF CUSTOMER-A is using BGP and has learned this prefix via BGP from the next-hop 192.168.1.2.

Last reviewed: Jun 24, 2026

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