350-401 Question 95
Single answerYou are tasked with deploying VRF (Virtual Routing and Forwarding) in a new multi-tenant network to isolate traffic between tenants. After the configuration, you notice that traffic from one VRF is leaking into another VRF. What is the most likely cause of this issue?
- A
Route leaking was accidentally configured between the VRFs.
- B
The interface assigned to the VRF does not have an IP address configured.
- C
The VRF is not associated with the correct routing table.
- D
The Layer 3 interfaces are not mapped to the correct VLANs.
Show answer and explanation
Correct answer: A
Explanation
VRFs are used to isolate routing and traffic between different virtual networks. Route leaking, if configured improperly, can break this isolation by allowing traffic or routes to cross between VRFs. Identifying and correcting unintended route leaking will resolve the issue.
- A. Correct.
Route leaking between VRFs allows routes to be shared, which could cause traffic to leak from one VRF to another. This is the most likely cause of the issue.
- B. Incorrect.
While an IP address is required for proper traffic forwarding, a missing IP address would prevent any traffic from flowing rather than causing inter-VRF leakage.
- C. Incorrect.
If the VRF is not associated with the correct routing table, routing within the VRF would fail, but it would not cause traffic to leak between VRFs.
- D. Incorrect.
Incorrect Layer 3 interfaces mapping to VLANs would cause connectivity issues but would not directly result in traffic being leaked between VRFs.