350-401 · Question #101
What is the main function of VRF-lite?
The correct answer is B. To segregate multiple routing tables on a single device. The question asks for the primary function of VRF-lite technology.
Question
What is the main function of VRF-lite?
Options
- ATo allow devices to use labels to make Layer 2 Path decisions
- BTo segregate multiple routing tables on a single device
- CTo connect different autonomous systems together to share routes
- DTo route IPv6 traffic across an IPv4 backbone
How the community answered
(50 responses)- A2% (1)
- B90% (45)
- C6% (3)
- D2% (1)
Why each option
The question asks for the primary function of VRF-lite technology.
Allowing devices to use labels for Layer 2 path decisions is a characteristic of Multi-Protocol Label Switching (MPLS) and related technologies, not VRF-lite.
VRF-lite (Virtual Routing and Forwarding-lite) allows a single physical router to maintain multiple independent routing and forwarding tables, effectively segmenting the network traffic and providing logical isolation for different services or customers without requiring MPLS.
Connecting different autonomous systems to share routes is the main function of Border Gateway Protocol (BGP).
Routing IPv6 traffic across an IPv4 backbone is typically achieved through tunneling mechanisms like 6to4, ISATAP, or GRE, or via MPLS 6PE/6VPE, rather than VRF-lite.
Concept tested: VRF-lite functionality
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750x_3560x_cg/swvrf.html
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