hardMultiple SelectObjective-mapped
300-410 Route Target (RT) Practice Question
Which TWO statements about the interaction between MP-BGP and the VRF routing table in an MPLS L3VPN PE router are correct? (Choose TWO.)
⚠ Common exam trap
Candidates often assume the RD remains in the VRF or that next-hop is always changed; neither is true.
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.
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.
- ✓
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.
- ✗
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.
Go deeper
Related to this question
Learn chapter
OSPF Route Summarization and Filtering
Key term
MP-BGP for VPN
MP-BGP for VPN is an extension of the Border Gateway Protocol that carries multiple types of network layer information to enable scalable, isolated virtual private networks over a shared provider infrastructure.
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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