350-601 Network Practice Question
In a Cisco ACI fabric, a tenant has multiple bridge domains with different subnets. The administrator wants to allow traffic between two EPGs in the same tenant but different bridge domains. Which ACI construct is required to enable communication?
⚠ Common exam trap
Cisco often tests the misconception that EPGs in the same tenant can communicate without a contract, but in ACI, all inter-EPG traffic (even within the same tenant) requires a contract unless the EPGs are in the same bridge domain and have unicast routing enabled.
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
✓
Contracts with filters and subjects
In Cisco ACI, EPGs in different bridge domains are isolated by default. To enable communication between them, a contract must be applied that defines the allowed traffic. Contracts use filters and subjects to specify permitted protocols and ports, and are the only native ACI mechanism for inter-EPG communication across bridge domains within the same tenant.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Contracts with filters and subjects
Why this is correct
Contracts specify allowed traffic between EPGs.
- ✗
Shared L3Out
Why it's wrong here
L3Out is for external connectivity.
- ✗
VRF route leaking
Why it's wrong here
VRF route leaking is used for inter-VRF, not between EPGs in same VRF.
- ✗
VMM domain integration
Why it's wrong here
VMM domain integrates with hypervisor, not for inter-EPG communication.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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