- A
External routed network (L3Out)
This defines the external connectivity.
- B
VMM domain
Why wrong: VMM is for virtualization integration, not L3Out.
- C
Service graph
Why wrong: Service graphs are for service insertion.
- D
Contract between external EPG and internal EPG
A contract must allow traffic between EPGs.
- E
Context (VRF) and Bridge Domain (BD) for the external network
The external network must be in a VRF and BD.
Question 103 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 ACI administrator is configuring external connectivity using L3Out. Which THREE components must be defined for a successful L3Out deployment? (Select three.)
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.
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.
- ✓
External routed network (L3Out)
Why this is correct
This defines the external connectivity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Context (VRF) and Bridge Domain (BD) for the external network
Why this is correct
The external network must be in a VRF and BD.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Under the hood, the L3Out object is associated with a specific VRF (Context) and uses the ACI spine switches as the routing gateway. The external EPG is automatically created within the L3Out and must be paired with a contract to allow traffic from internal EPGs; without the contract, the fabric’s default enforcement would drop all traffic between the external network and internal endpoints. The Bridge Domain for the external network is required to define the subnet and gateway IP that the ACI fabric uses to route traffic to the external router.
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: 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.
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.
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Last reviewed: Jul 4, 2026
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