- A
VLAN ID
Why wrong: VLAN ID is local to a switch; VNI is the overlay identifier.
- B
VTEP IP
Why wrong: VTEP IP identifies the tunnel endpoint.
- C
VNI
Correct: VNI maps to the VLAN.
- D
VPC
Why wrong: VPC provides redundancy, not overlay mapping.
Question 15 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 needs to extend a Layer 2 VLAN across a VXLAN EVPN fabric. Which construct maps the VLAN to the overlay network?
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
✓
VNI
In a VXLAN EVPN fabric, the VNI (VXLAN Network Identifier) is the construct that maps a Layer 2 VLAN to the overlay network. The VNI uniquely identifies a Layer 2 segment across the underlay, allowing VLAN traffic to be encapsulated and transported over the IP fabric. This mapping is configured on the VTEP (VXLAN Tunnel Endpoint) using commands like 'vlan 100' mapped to 'vn-segment 10100' under the VLAN configuration.
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.
- ✗
VLAN ID
Why it's wrong here
VLAN ID is local to a switch; VNI is the overlay identifier.
- ✗
VTEP IP
Why it's wrong here
VTEP IP identifies the tunnel endpoint.
- ✓
VNI
Why this is correct
Correct: VNI maps to the VLAN.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
VPC
Why it's wrong here
VPC provides redundancy, not overlay mapping.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between VLAN ID (local significance) and VNI (global overlay identifier), and the trap here is that candidates confuse the VTEP IP (the tunnel endpoint) with the VNI (the network identifier), or think VPC plays a role in overlay mapping.
Detailed technical explanation
How to think about this question
The VNI is a 24-bit field in the VXLAN header (RFC 7348) that supports up to 16 million segments, far exceeding the 4096 VLAN limit. In Cisco NX-OS, the mapping is achieved via the 'vn-segment' command under the VLAN configuration, which associates a VLAN with a specific VNI, and the EVPN control plane (MP-BGP) then advertises this mapping to remote VTEPs. A real-world scenario is extending a VLAN across a data center interconnect (DCI) where the VNI ensures consistent Layer 2 adjacency regardless of the underlying IP network.
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 help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Visual reference
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: VNI — In a VXLAN EVPN fabric, the VNI (VXLAN Network Identifier) is the construct that maps a Layer 2 VLAN to the overlay network. The VNI uniquely identifies a Layer 2 segment across the underlay, allowing VLAN traffic to be encapsulated and transported over the IP fabric. This mapping is configured on the VTEP (VXLAN Tunnel Endpoint) using commands like 'vlan 100' mapped to 'vn-segment 10100' under the VLAN configuration.
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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