350-601 Security Practice Question
In an ACI fabric, an EPG is configured with a contract that allows HTTP traffic to an external network. The external network is reachable via a Layer 3 Outside. However, HTTP traffic from the EPG fails. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the misconception that a contract alone is sufficient for inter-VRF communication, but in ACI, contracts are VRF-scoped and cannot bridge different VRFs without additional configuration like a VRF route leak or a shared service contract.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The L3Out and the EPG are in different VRFs
In Cisco ACI, communication between an EPG and an external network via a Layer 3 Outside requires both to be in the same VRF. If the EPG and the L3Out are in different VRFs, the contract cannot be enforced, and traffic will fail even if the contract allows HTTP. The VRF provides the routing and policy enforcement boundary for the contract.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The subject action is set to deny
Why it's wrong here
If the subject action were deny, no external HTTP would be allowed.
- ✓
The L3Out and the EPG are in different VRFs
Why this is correct
ACI contracts only work within the same VRF. If the L3Out is in a different VRF, route leaking is required.
- ✗
The filter uses the wrong direction
Why it's wrong here
Direction settings in filters affect which endpoints can initiate, but the HTTP filter should be bidirectional or set correctly.
- ✗
The contract is applied to the consumer EPG instead of the provider
Why it's wrong here
HTTP traffic originates from the EPG (consumer) to the external network (provider). The contract must be applied appropriately.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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