350-601 Security Practice Question
An ACI fabric administrator wants to enable microsegmentation for workloads in a Virtual Routing and Forwarding (VRF) instance. The security policy must allow communication between two endpoints based on their EPG (Endpoint Group) membership, regardless of IP address. Which construct must be used?
⚠ Common exam trap
Cisco often tests the misconception that vzAny or the VRF itself can replace a contract for EPG-to-EPG microsegmentation, but the trap is that vzAny is a global policy object and the VRF is only a routing context—neither provides the granular, EPG-specific permit/deny rules that a contract with filter and subject enforces.
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
✓
Contract with filter and subject
A contract with a filter and subject is required to enable microsegmentation in ACI because it defines the explicit rules for communication between EPGs. The contract specifies which EPGs can talk to each other, the filter defines the L4/L7 parameters (e.g., protocol, ports), and the subject binds the filter to the contract, allowing policy enforcement regardless of IP address. This is the only construct that supports EPG-based security policies for intra-VRF microsegmentation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Contract with filter and subject
Why this is correct
Contracts in ACI define allowed traffic between EPGs based on filters.
- ✗
vzAny
Why it's wrong here
vzAny applies contracts to all EPGs in a VRF, not specific microsegmentation.
- ✗
VRF
Why it's wrong here
VRF provides separation but does not define microsegmentation policies.
- ✗
Bridge Domain (BD)
Why it's wrong here
BD is a Layer 2 forwarding construct.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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