- A
The PE will export routes from VRF CUSTOMER-B with RT 100:1 and import routes with RT 100:2.
The route-target export sets the RT on exported VPNv4 routes; the route-target import filters incoming VPNv4 routes to only those with RT 100:2.
- B
The PE will export routes with RT 100:2 and import routes with RT 100:1.
Why wrong: This reverses the export and import RTs, which is not what is configured.
- C
The VRF will not work because the RD and RT must be identical.
Why wrong: RD and RT are independent; they can be different. RD is used to make routes unique, RT controls import/export.
- D
The VRF will not work because route-target import and export must be configured under the BGP VRF address-family.
Why wrong: Route-targets are configured under the VRF definition, not under BGP. This is the correct place.
Quick Answer
The correct answer is that the PE router will export routes from VRF CUSTOMER-B with route-target 100:1 and import only those routes tagged with route-target 100:2. This is because the route-target export command assigns the specified value to routes originating from this VRF when they are advertised via MP-BGP, while the route-target import command acts as a filter, telling the VRF to accept only incoming routes that carry the matching import RT. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of how VRFs isolate customer routing tables in MPLS Layer 3 VPNs, and a common trap is confusing the export and import directions—remember that export tags your own routes for others, while import pulls in routes from others. A useful memory tip is “export goes out, import comes in,” or simply think of the VRF as a club: the export RT is your membership badge you show to others, and the import RT is the badge you require from visitors to let them in.
300-410 MPLS L3VPN Practice Question
This 300-410 practice question tests your understanding of mpls l3vpn. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Consider the following configuration on a PE router:
ip vrf CUSTOMER-B
rd 100:1 route-target export 100:1 route-target import 100:2 !
interface GigabitEthernet0/2 ip vrf forwarding CUSTOMER-B ip address 192.168.2.1 255.255.255.252
What is the effect of this configuration?
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 PE will export routes from VRF CUSTOMER-B with RT 100:1 and import routes with RT 100:2.
The VRF has a route distinguisher and route-targets. The export RT is 100:1, meaning routes from this VRF are exported with that RT. The import RT is 100:2, so only routes with RT 100:2 are imported. This is a common setup for hub-and-spoke or inter-AS options.
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 PE will export routes from VRF CUSTOMER-B with RT 100:1 and import routes with RT 100:2.
Why this is correct
The route-target export sets the RT on exported VPNv4 routes; the route-target import filters incoming VPNv4 routes to only those with RT 100:2.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The PE will export routes with RT 100:2 and import routes with RT 100:1.
Why it's wrong here
This reverses the export and import RTs, which is not what is configured.
- ✗
The VRF will not work because the RD and RT must be identical.
Why it's wrong here
RD and RT are independent; they can be different. RD is used to make routes unique, RT controls import/export.
- ✗
The VRF will not work because route-target import and export must be configured under the BGP VRF address-family.
Why it's wrong here
Route-targets are configured under the VRF definition, not under BGP. This is the correct place.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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MPLS L3VPN — study guide chapter
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FAQ
Questions learners often ask
What does this 300-410 question test?
MPLS L3VPN — This question tests MPLS L3VPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The PE will export routes from VRF CUSTOMER-B with RT 100:1 and import routes with RT 100:2. — The VRF has a route distinguisher and route-targets. The export RT is 100:1, meaning routes from this VRF are exported with that RT. The import RT is 100:2, so only routes with RT 100:2 are imported. This is a common setup for hub-and-spoke or inter-AS options.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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 →
Same concept, more angles
1 more ways this is tested on 300-410
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. Examine the following configuration on a PE router: ip vrf CUSTOMER-C rd 200:1 ! interface GigabitEthernet0/3 ip vrf forwarding CUSTOMER-C ip address 10.2.2.1 255.255.255.252 ! router ospf 1 vrf CUSTOMER-C network 10.2.2.0 0.0.0.3 area 0 ! router bgp 65000 address-family ipv4 vrf CUSTOMER-C redistribute ospf 1 exit-address-family What is missing from this configuration?
medium- ✓ A.The VRF is missing route-target export and import commands.
- B.The OSPF network command should use a wildcard mask of 0.0.0.0.
- C.The BGP neighbor must be configured under the VRF address-family.
- D.The VRF must have a route distinguisher that matches the route-target.
Why A: The VRF is missing route-target import and export commands. Without route-targets, the VPNv4 routes will not be tagged with an RT, and the remote PE will not know which VRF to import them into. Also, the OSPF process is configured under the VRF, and redistribution is done, but the RT is missing.
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Last reviewed: Jun 18, 2026
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