350-601 Network Practice Question
In VXLAN, what is the role of the VNI in the overlay network?
⚠ Common exam trap
It's easy for candidates to 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.
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.
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.
- ✗
Specifies the underlay VRF
Why it's wrong here
VNI is an overlay identifier.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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