350-601 Network Practice Question
An ACI administrator is configuring external connectivity using L3Out. Which THREE components must be defined for a successful L3Out deployment? (Select three.)
⚠ Common exam trap
Cisco often tests the misconception that a VMM domain or service graph is mandatory for L3Out, when in fact only the L3Out object, the contract between external and internal EPGs, and the VRF/BD for the external network are strictly required.
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
✓
External routed network (L3Out)
The external routed network (L3Out) is the fundamental construct that defines the Layer 3 connectivity from the ACI fabric to an external router or network. It specifies the routing protocol (e.g., OSPF, BGP, or static), the external interfaces, and the protocol policies required for the ACI spine switches to exchange routes with external devices. Without defining the L3Out object, the fabric has no configured path or policy to reach external destinations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
External routed network (L3Out)
Why this is correct
This defines the external connectivity.
- ✗
VMM domain
Why it's wrong here
VMM is for virtualization integration, not L3Out.
- ✗
Service graph
Why it's wrong here
Service graphs are for service insertion.
- ✓
Contract between external EPG and internal EPG
Why this is correct
A contract must allow traffic between EPGs.
- ✓
Context (VRF) and Bridge Domain (BD) for the external network
Why this is correct
The external network must be in a VRF and BD.
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JA
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.