350-401 Question 107
Single answerA network engineer is tasked with deploying a solution that allows multiple virtual networks to operate on the same physical infrastructure, ensuring traffic isolation between tenants. Which network virtualization concept best meets this requirement?
- A
Virtual LANs (VLANs)
- B
Network Address Translation (NAT)
- C
Virtual Routing and Forwarding (VRF)
- D
Software-Defined Networking (SDN)
Show answer and explanation
Correct answer: C
Explanation
Virtual Routing and Forwarding (VRF) is the correct answer because it allows multiple virtual routing tables to operate on the same physical infrastructure. This capability ensures complete Layer 3 traffic isolation, making it an ideal solution for multi-tenant environments. While VLANs and SDN have their uses in network virtualization, neither provides the specific functionality offered by VRF for routing isolation.
- A. Incorrect.
VLANs allow segmentation of traffic at Layer 2, but they do not provide the capability to manage separate routing tables or Layer 3 isolation between tenants.
- B. Incorrect.
NAT translates IP addresses between private and public networks, but it does not provide traffic isolation or the ability to create multiple virtual networks on the same infrastructure.
- C. Correct.
VRF enables multiple virtual routing tables to coexist on the same router, providing traffic isolation and allowing multiple tenants to operate independent Layer 3 networks on the same physical infrastructure.
- D. Incorrect.
SDN is a network architecture approach that centralizes control, but it is not specifically designed for Layer 3 traffic isolation between tenants like VRF.