hardMultiple Choice
350-401 Practice Question: Runs the following command on Router R2: R2# show…
A network engineer runs the following command on Router R2:
R2# show vrf detail
VRF CUSTOMER-B (VRF Id = 1); default RD 65000:1; default VPNID <not set>
Interfaces:
GigabitEthernet0/0.200 GigabitEthernet0/1.200 Address family IPV4 unicast: Export VPN route-target communities: RT:65000:100 Import VPN route-target communities: RT:65000:100
No export route-map
No import route-mapAddress family IPV6 unicast: Export VPN route-target communities: RT:65000:100 Import VPN route-target communities: RT:65000:100 Members:
10.0.0.0/24
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the misconception that a VRF supports only one address family (IPv4) by default, but the 'show vrf detail' output clearly shows separate address family sections, and candidates may overlook the IPv6 unicast section if they focus only on the route-target values.
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 VRF supports both IPv4 and IPv6 VPNs with matching route-targets
The output shows both 'Address family IPV4 unicast' and 'Address family IPV6 unicast' sections, each with the same export and import route-target communities (RT:65000:100). This confirms the VRF CUSTOMER-B supports both IPv4 and IPv6 VPN address families with matching route-targets, enabling MPLS L3VPN services for both address families over the same 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.
- ✗
The VRF is configured for IPv4 only
Why it's wrong here
The output clearly lists both the IPv4 address family (ipv4 unicast) and the IPv6 address family (ipv6 unicast) within the VRF configuration. A VRF that is configured for IPv4 only would not contain an explicit IPv6 unicast address family section. The presence of both address families indicates dual-stack support, which is a standard feature for VRFs in MPLS Layer 3 VPN deployments.
- ✗
The VRF uses different route-targets for import and export
Why it's wrong here
Both the route-target import and export statements in the output use the exact same community value, 65000:100. The claim that the VRF uses different route-targets for import and export is therefore incorrect. Symmetric route-targets are commonly used when the VRF has the same import and export policy, allowing routes to be exchanged bidirectionally with the same VPN peers.
- ✓
The VRF supports both IPv4 and IPv6 VPNs with matching route-targets
Why this is correct
The VRF configuration includes both an IPv4 unicast and an IPv6 unicast address family, each with its own VRF table. Additionally, both address families are configured with the same route-target value of 65000:100 for both import and export. This means the VRF supports both IPv4 and IPv6 VPNs, and the matching route-targets ensure that routes from both address families are respectively imported and exported to the same VPNv4/VPNv6 neighbors.
- ✗
The VRF has no interfaces assigned
Why it's wrong here
The VRF configuration output explicitly lists two interfaces under the 'Interfaces' section, which proves that the VRF has active bindings to physical or sub-interfaces. An unassigned VRF would show an empty interface list, but here the presence of two interfaces means the VRF can forward traffic for those attached networks. This invalidates the claim that no interfaces are assigned to the VRF.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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