350-601 Network Practice Question
An engineer is designing an ACI fabric and needs to provide connectivity to an external Layer 3 network. Which construct must be configured to achieve this?
⚠ Common exam trap
Cisco often tests the distinction between internal fabric constructs (EPGs, VMM domains) and external connectivity constructs (L3Out), so the trap here is confusing an EPG or VMM domain as the solution for Layer 3 external routing when they serve entirely different purposes within the ACI architecture.
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
✓
L3Out
To connect an ACI fabric to an external Layer 3 network, you must configure an L3Out. An L3Out defines the external routed connectivity by associating a VRF with external interfaces, routing protocols (e.g., OSPF, BGP, EIGRP), and subnets that are advertised into or from the fabric. This construct allows ACI to exchange routes with the external Layer 3 domain.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VMM domain
Why it's wrong here
VMM domain integrates with hypervisors, not external networks.
- ✗
EPG
Why it's wrong here
EPG is a group of endpoints within a tenant.
- ✓
L3Out
Why this is correct
L3Out provides external Layer 3 connectivity via routed interfaces or subinterfaces.
- ✗
VXLAN tunnel
Why it's wrong here
ACI uses VXLAN internally but L3Out is the external connection.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.