350-501 Networking Practice Question
An engineer is configuring an MPLS L3VPN and needs to ensure that the PE router installs VPNv4 routes from a remote PE into the VRF of a customer. The remote PE sends a VPNv4 route with route-target 100:1. Which configuration on the local PE causes the route to be imported into the VRF?
⚠ Common exam trap
Cisco often tests the distinction between `route-target import` and `route-target export`, and the trap here is that candidates may select the export-only option (D) or misplace the RT command under BGP (A), failing to recognize that import must be explicitly configured under the VRF definition to receive routes from a remote PE.
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
✓
vrf definition CUSTOMER rd 100:1 route-target import 100:1
The `route-target import 100:1` command under the VRF definition configures the local PE to accept VPNv4 routes that carry the specified route-target (100:1) from the remote PE. This import RT must match the export RT of the remote PE for the route to be installed into the VRF's routing table. The `rd 100:1` defines the route distinguisher, which is separate from the RT and ensures uniqueness of the VPNv4 prefix.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
router bgp 100 address-family ipv4 vrf CUSTOMER route-target import 100:1
Why it's wrong here
The route-target import is configured under the VRF, not under BGP address-family.
- ✗
vrf definition CUSTOMER rd 100:1 route-target both 100:1 route-map IMPORT
Why it's wrong here
Route-map is not used with route-target import; it's used for filtering.
- ✓
vrf definition CUSTOMER rd 100:1 route-target import 100:1
Why this is correct
This imports routes with RT 100:1 into the VRF.
- ✗
vrf definition CUSTOMER rd 100:1 route-target export 100:1
Why it's wrong here
Export is for advertising routes, not importing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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