- A
A VPNv4 route received from a remote PE is installed in the VRF routing table only if its Route Target matches an import RT configured under the VRF.
Correct. The import RT matching is required for VRF installation.
- B
The Route Distinguisher (RD) is automatically removed from the VPNv4 prefix before the route is placed into the VRF routing table.
Correct. The RD is stripped from the VPNv4 prefix, and the IPv4 route is installed in the VRF.
- C
When a PE originates a VPNv4 route, it uses the export RT of the VRF to tag the route, and the receiving PE uses the export RT to decide whether to accept the route.
Why wrong: Incorrect. The receiving PE uses the import RT, not export RT, to accept routes.
- D
The next-hop of a VPNv4 route received from a remote PE is always changed to the local PE's loopback interface address before installation into the VRF.
Why wrong: Incorrect. The next-hop is only changed if next-hop-self is configured; it is not the default behavior.
- E
The Route Distinguisher (RD) ensures that overlapping IPv4 prefixes from different customers remain unique within the MPLS VPN network.
Why wrong: Incorrect. The RD ensures VPNv4 prefix uniqueness in BGP but does not prevent overlapping prefixes in the same VRF.
Route Target Import/Export in MPLS L3VPN
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. A key principle to apply: route Target (RT). 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.
Which TWO statements about the interaction between MP-BGP and the VRF routing table in an MPLS L3VPN PE router are correct? (Choose TWO.)
Quick Answer
The correct answer identifies that the Route Distinguisher (RD) ensures overlapping IPv4 prefixes from different customers remain unique within the MPLS VPN network, and that a VPNv4 route is installed into the VRF routing table only when its Route Target (RT) matches an import RT configured in that VRF. This works because MP-BGP carries VPNv4 prefixes—formed by prepending the RD to the IPv4 prefix—between PE routers, while the import/export RT mechanism controls which routes are accepted into or advertised from a VRF. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how MPLS L3VPN isolates customer routing tables; a common trap is confusing the RD’s role in making prefixes unique with the RT’s role in controlling route distribution. Remember: the RD is for uniqueness, the RT is for import/export policy. A helpful memory tip is “RD keeps it unique, RT keeps it selective.”
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
A VPNv4 route received from a remote PE is installed in the VRF routing table only if its Route Target matches an import RT configured under the VRF.
In MPLS L3VPN, MP-BGP exchanges VPNv4 routes between PE routers. A received VPNv4 route is installed in the VRF routing table only if its Route Target matches an import RT of the VRF (A correct). The Route Distinguisher (RD) is automatically removed from the VPNv4 prefix before installation; the VRF stores only the IPv4 prefix (B correct). Statement C is false because the receiving PE uses the import RT, not export RT. Statement D is false because the next-hop is not always changed to the local loopback; it is only changed if next-hop-self is configured. Statement E is false; the RD ensures uniqueness of VPNv4 prefixes in the BGP table, but overlapping prefixes from different customers can exist in the same VRF if they are in different VRFs; the RD does not prevent overlapping prefixes within a single VRF.
Key principle: Route Target (RT)
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A VPNv4 route received from a remote PE is installed in the VRF routing table only if its Route Target matches an import RT configured under the VRF.
Why this is correct
Correct. The import RT matching is required for VRF installation.
Related concept
Route Target (RT)
- ✓
The Route Distinguisher (RD) is automatically removed from the VPNv4 prefix before the route is placed into the VRF routing table.
Why this is correct
Correct. The RD is stripped from the VPNv4 prefix, and the IPv4 route is installed in the VRF.
Related concept
Route Target (RT)
- ✗
When a PE originates a VPNv4 route, it uses the export RT of the VRF to tag the route, and the receiving PE uses the export RT to decide whether to accept the route.
Why it's wrong here
Incorrect. The receiving PE uses the import RT, not export RT, to accept routes.
- ✗
The next-hop of a VPNv4 route received from a remote PE is always changed to the local PE's loopback interface address before installation into the VRF.
Why it's wrong here
Incorrect. The next-hop is only changed if next-hop-self is configured; it is not the default behavior.
- ✗
The Route Distinguisher (RD) ensures that overlapping IPv4 prefixes from different customers remain unique within the MPLS VPN network.
Why it's wrong here
Incorrect. The RD ensures VPNv4 prefix uniqueness in BGP but does not prevent overlapping prefixes in the same VRF.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often assume the RD remains in the VRF or that next-hop is always changed; neither is true.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Route Target (RT)
- Route Distinguisher (RD)
- VRF Route Import
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
Route Target (RT)
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. Route Target (RT) 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.
Review route Target (RT), then practise related 300-410 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this 300-410 question test?
MPLS L3VPN — This question tests MPLS L3VPN — Route Target (RT).
What is the correct answer to this question?
The correct answer is: A VPNv4 route received from a remote PE is installed in the VRF routing table only if its Route Target matches an import RT configured under the VRF. — In MPLS L3VPN, MP-BGP exchanges VPNv4 routes between PE routers. A received VPNv4 route is installed in the VRF routing table only if its Route Target matches an import RT of the VRF (A correct). The Route Distinguisher (RD) is automatically removed from the VPNv4 prefix before installation; the VRF stores only the IPv4 prefix (B correct). Statement C is false because the receiving PE uses the import RT, not export RT. Statement D is false because the next-hop is not always changed to the local loopback; it is only changed if next-hop-self is configured. Statement E is false; the RD ensures uniqueness of VPNv4 prefixes in the BGP table, but overlapping prefixes from different customers can exist in the same VRF if they are in different VRFs; the RD does not prevent overlapping prefixes within a single VRF.
What should I do if I get this 300-410 question wrong?
Review route Target (RT), then practise related 300-410 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Route Target (RT)
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Last reviewed: Jun 18, 2026
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