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350-501 · Question #111

Which statement about VRF Lite is true?

The correct answer is D. MPLS label switching and the MPLS control plane are unsupported in the VRF Lite. VRF-Lite is a feature that allows a router to support multiple routing instances (VRFs) without requiring an MPLS backbone, meaning it does not use MPLS label switching or its control plane.

Networking

Question

Which statement about VRF Lite is true?

Options

  • AIt is an IPv6 transition mechanism that facilitates IPv6 transport across an MPLS network, based
  • BIt allows multiple customers to share one CE, which maintains separate VRF tables by using RT
  • CIt extends the PE functionality to a CE by using VLAN SVI connectivity between the PE and CE, a
  • DMPLS label switching and the MPLS control plane are unsupported in the VRF Lite

How the community answered

(24 responses)
  • B
    4% (1)
  • C
    8% (2)
  • D
    88% (21)

Why each option

VRF-Lite is a feature that allows a router to support multiple routing instances (VRFs) without requiring an MPLS backbone, meaning it does not use MPLS label switching or its control plane.

AIt is an IPv6 transition mechanism that facilitates IPv6 transport across an MPLS network, based

This describes IPv6 transition mechanisms like 6PE/6VPE or 6to4/ISATAP tunnels, not the function of VRF-Lite.

BIt allows multiple customers to share one CE, which maintains separate VRF tables by using RT

While a CE might maintain separate VRFs in a VRF-Lite setup, the core definition of VRF-Lite is its operation without MPLS, rather than specifically how it enables customer sharing.

CIt extends the PE functionality to a CE by using VLAN SVI connectivity between the PE and CE, a

VRF-Lite enables a router to host multiple VRFs, but it is not defined as extending PE functionality to a CE using VLAN SVIs, though such a deployment scenario is possible with VRF-Lite.

DMPLS label switching and the MPLS control plane are unsupported in the VRF LiteCorrect

VRF-Lite enables a router to maintain multiple independent routing tables (VRFs) and forward IP packets based on the associated VRF. Unlike MPLS VPNs, VRF-Lite operates solely on the IP layer and explicitly does not utilize MPLS label switching or the MPLS control plane for traffic separation or forwarding.

Concept tested: VRF-Lite characteristics and distinction from MPLS VPNs

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_vrf/configuration/15-mt/iri-vrf-15-mt-book/iri-vrf-lite.html

Topics

#VRF Lite#Virtual Routing and Forwarding#MPLS Contrast

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