350-601 Network Practice Question
In a Cisco ACI fabric, an external L3Out is configured to advertise a subnet to the outside. Which object must be created in the tenant to define the Layer 3 outside network connection?
⚠ Common exam trap
Candidates often confuse the External EPG (which groups external endpoints) with the L3Out itself, but the L3Out is the actual configuration object that defines the Layer 3 outside network connection and routing policies.
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
In Cisco ACI, an L3Out is the object that defines the Layer 3 outside network connection for a tenant. It is created within the tenant to specify the routing protocol (e.g., OSPF, BGP, EIGRP) and the external subnet that will be advertised to the outside world. Without an L3Out, the fabric cannot establish external connectivity or advertise routes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
L3Out
Why this is correct
L3Out is the object that defines the external connection.
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External EPG
Why it's wrong here
External EPG is part of L3Out but not the connection object itself.
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Contract
Why it's wrong here
Contracts are used for policy between EPGs.
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Bridge Domain
Why it's wrong here
Bridge Domain is for internal Layer 2 forwarding.
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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.