- A
Identifies the VTEP
Why wrong: VTEP is identified by IP address.
- B
Encapsulation type
Why wrong: Encapsulation is VXLAN, VNI is identifier.
- C
Identifies the overlay network segment
VNI maps to a Layer 2 segment.
- D
Specifies the underlay VRF
Why wrong: VNI is an overlay identifier.
Question 134 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 VXLAN, what is the role of the VNI in 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
✓
Identifies the overlay network segment
The VNI (VXLAN Network Identifier) is a 24-bit field in the VXLAN header that uniquely identifies a Layer 2 overlay network segment, analogous to a VLAN ID in traditional networking. It allows multiple tenants or broadcast domains to coexist over a shared underlay network by isolating traffic at the overlay level.
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.
- ✗
Identifies the VTEP
Why it's wrong here
VTEP is identified by IP address.
- ✗
Encapsulation type
Why it's wrong here
Encapsulation is VXLAN, VNI is identifier.
- ✓
Identifies the overlay network segment
Why this is correct
VNI maps to a Layer 2 segment.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Specifies the underlay VRF
Why it's wrong here
VNI is an overlay identifier.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the VNI with the VLAN ID or think it identifies the VTEP, but Cisco tests that the VNI specifically identifies the overlay network segment, not the endpoint or encapsulation method.
Detailed technical explanation
How to think about this question
The VNI is carried in the VXLAN header (RFC 7348) as a 24-bit value, allowing up to 16 million unique segments. In a multi-tenant environment, each tenant's VLAN is mapped to a unique VNI, and the VTEP uses this VNI to perform MAC address learning and forwarding decisions within the overlay, ensuring traffic isolation even if the underlay uses a shared IP fabric.
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: Identifies the overlay network segment — The VNI (VXLAN Network Identifier) is a 24-bit field in the VXLAN header that uniquely identifies a Layer 2 overlay network segment, analogous to a VLAN ID in traditional networking. It allows multiple tenants or broadcast domains to coexist over a shared underlay network by isolating traffic at the overlay level.
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
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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