350-401 Question 100
Single answerA network engineer is tasked with configuring Virtual Routing and Forwarding (VRF) on a Cisco router to isolate traffic for different departments within the organization. The engineer creates two VRFs: 'HR' and 'Finance'. After configuration, the engineer notices that devices in the 'HR' VRF cannot communicate with devices in the 'Finance' VRF, even though both are on the same router. What is the most likely cause of this issue?
- A
The VRFs were configured without exporting and importing route targets.
- B
VRFs inherently do not allow communication between them by design.
- C
The router does not support VRF configurations.
- D
A VLAN misconfiguration is preventing communication between the VRFs.
Show answer and explanation
Correct answer: B
Explanation
VRFs are designed to isolate traffic by maintaining separate routing tables for each VRF. This isolation is one of the primary purposes of configuring VRFs. Communication between VRFs is not allowed by default and requires additional configurations, such as route leaking or using a shared interface. The issue described in the scenario is most likely due to the inherent design of VRFs, which do not allow communication between them without explicit configuration.
- A. Incorrect.
Exporting and importing route targets is required for sharing routes between VRFs, but it does not inherently enable communication between VRFs without additional steps.
- B. Correct.
By design, VRFs are used to isolate traffic and maintain separate routing tables. Inter-VRF communication requires additional configurations, such as route leaking.
- C. Incorrect.
If the router did not support VRF configurations, the engineer would not have been able to create and configure the VRFs in the first place.
- D. Incorrect.
A VLAN misconfiguration would affect Layer 2 connectivity but is not directly related to the issue of inter-VRF communication.