- A
Bridge Domain
Why wrong: BD is for internal L2, not external.
- B
L3Out
L3Out defines the external connectivity and routing protocol.
- C
Contract
Why wrong: Contract is for policy between EPGs, not external routing.
- D
External EPG
Why wrong: External EPG is part of L3Out but not the object that advertises networks.
Question 316 of 1,000
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
In the context of ACI L3Out, which object is used to advertise external networks into the ACI fabric and is associated with a VRF?
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 ACI, an L3Out is the logical construct that provides connectivity from the ACI fabric to external Layer 3 networks. It is associated with a VRF to define the routing context, and it is the object under which external networks are advertised into the fabric via route redistribution or static routes. The L3Out contains the external EPGs and the protocol profiles (e.g., OSPF, BGP, EIGRP) that control the advertisement.
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.
- ✗
Bridge Domain
Why it's wrong here
BD is for internal L2, not external.
- ✓
L3Out
Why this is correct
L3Out defines the external connectivity and routing protocol.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Contract
Why it's wrong here
Contract is for policy between EPGs, not external routing.
- ✗
External EPG
Why it's wrong here
External EPG is part of L3Out but not the object that advertises networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that an External EPG is the object associated with the VRF for route advertisement, but in reality, the L3Out is the parent object that holds the VRF association and controls the routing protocols.
Detailed technical explanation
How to think about this question
Under the hood, the L3Out leverages a VRF to isolate routing tables and uses protocols like OSPF (RFC 2328) or BGP (RFC 4271) to exchange routes with external routers. The L3Out’s route map and redistribution policies control which external prefixes are injected into the COOP (Council of Oracles Protocol) database, which then distributes them to all leaf switches in the fabric. A real-world scenario is advertising a /24 subnet from a data center core router into ACI; the L3Out’s external EPG defines the subnet, and the L3Out’s protocol profile handles the BGP peering.
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 — In ACI, an L3Out is the logical construct that provides connectivity from the ACI fabric to external Layer 3 networks. It is associated with a VRF to define the routing context, and it is the object under which external networks are advertised into the fabric via route redistribution or static routes. The L3Out contains the external EPGs and the protocol profiles (e.g., OSPF, BGP, EIGRP) that control the advertisement.
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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