350-601 Network Practice Question
In ACI, what is the purpose of a contract?
⚠ Common exam trap
Cisco often tests the misconception that contracts are used for routing or tenant isolation, when in fact they are strictly a policy mechanism for traffic filtering between EPGs, not a routing or tenancy construct.
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
✓
Allow or deny traffic between EPGs
In Cisco ACI, a contract is a policy construct that defines how communication is allowed or denied between Endpoint Groups (EPGs). Contracts specify the subjects, filters, and actions (permit or deny) that govern traffic flows, enabling granular security and segmentation within the fabric. Without a contract, EPGs in different bridge domains or VRFs cannot communicate by default.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Isolate tenants
Why it's wrong here
Tenants provide isolation.
- ✗
Define routing between VRF
Why it's wrong here
Contracts are between EPGs, not VRFs.
- ✓
Allow or deny traffic between EPGs
Why this is correct
Contracts are the policy mechanism.
- ✗
Provide external connectivity
Why it's wrong here
L3Out provides external connectivity.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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