350-601 Network Practice Question
In a Cisco ACI fabric, a new EPG is created and associated with a bridge domain that has 'Unicast Routing' enabled. However, endpoints in that EPG cannot communicate with endpoints in other EPGs in the same VRF. What is missing?
⚠ Common exam trap
Cisco often tests the misconception that enabling unicast routing on a bridge domain is sufficient for inter-EPG communication, when in fact contracts are mandatory in ACI to allow any traffic between EPGs.
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
✓
A contract between the EPGs
In Cisco ACI, communication between EPGs within the same VRF is not allowed by default; it requires a contract. A contract defines the policies (allow/deny) and filters for traffic between EPGs. Without a contract, all traffic is dropped, even if the bridge domain has unicast routing enabled. Option C is correct because the missing element is the contract that explicitly permits inter-EPG communication.
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 EPG must be attached to a Layer 3 outside
Why it's wrong here
L3out is for external connectivity, not for internal EPG communication.
- ✗
The bridge domain must have 'L3 Unknown Multicast Flooding' set
Why it's wrong here
This setting affects multicast handling, not unicast inter-EPG communication.
- ✓
A contract between the EPGs
Why this is correct
Inter-EPG communication requires a contract; without it, packets are dropped.
- ✗
A route leak between bridge domains
Why it's wrong here
Bridge domains in the same VRF can route to each other if unicast routing is enabled; no explicit leak needed.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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