- A
VMM domain
Why wrong: VMM domain integrates with hypervisors, not external networks.
- B
EPG
Why wrong: EPG is a group of endpoints within a tenant.
- C
L3Out
L3Out provides external Layer 3 connectivity via routed interfaces or subinterfaces.
- D
VXLAN tunnel
Why wrong: ACI uses VXLAN internally but L3Out is the external connection.
Question 198 of 1,000
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
VXLAN tunnel
Why it's wrong here
ACI uses VXLAN internally but L3Out is the external connection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
An L3Out leverages a VRF (private network) and can use routed subinterfaces or switched virtual interfaces (SVIs) on the leaf switches, with external routers connected via Layer 2 or Layer 3 links. The L3Out configuration includes a contract to permit traffic from the external network to EPGs, and it supports route redistribution between the ACI fabric and external routing protocols like OSPF (RFC 2328) or BGP (RFC 4271). In a real-world scenario, an L3Out is essential for connecting an ACI fabric to a corporate WAN or the internet, where the fabric must advertise its internal subnets and learn external routes.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
What to study next
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FAQ
Questions learners often ask
What does this 350-601 question test?
Network — This question tests Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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.
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