300-420 Question 130
Single answerAn enterprise is designing its network to support multiple customer groups while maintaining isolation between their traffic. The network team is considering using VRFs to achieve this goal. Which of the following statements about VRF implementation in the enterprise network is correct?
- A
VRFs allow multiple routing tables to coexist on the same physical router, ensuring traffic segregation.
- B
VRFs require a separate physical interface for each routing instance to function properly.
- C
VRFs do not support the use of MPLS for traffic forwarding between different sites.
- D
VRFs automatically exchange routing information between instances without additional configuration.
Show answer and explanation
Correct answer: A
Explanation
VRFs (Virtual Routing and Forwarding) allow multiple routing tables to operate on the same device, enabling traffic segregation for different customer groups or organizational departments. This is particularly useful in enterprise environments where logical separation of traffic is required without deploying additional physical hardware. The other options contain misconceptions about VRF functionality or requirements.
- A. Correct.
Correct. VRFs enable the creation of multiple routing tables on the same physical router, allowing for traffic segregation without requiring additional physical hardware.
- B. Incorrect.
Incorrect. VRFs can work with logical interfaces (e.g., subinterfaces or VLANs) and do not require separate physical interfaces for each routing instance.
- C. Incorrect.
Incorrect. VRFs are often used in conjunction with MPLS to extend traffic isolation across different sites or locations.
- D. Incorrect.
Incorrect. VRFs do not automatically exchange routing information between instances; specific mechanisms like route leaking must be configured if communication between VRFs is needed.