350-601 Network Practice Question
A network engineer is planning a VXLAN EVPN fabric. Which two statements about VXLAN Network Identifiers (VNIs) are correct? (Choose two.)
⚠ Common exam trap
Cisco often tests the VNI range (24-bit vs. 12-bit VLAN ID) to catch candidates who confuse VXLAN VNIs with traditional VLAN IDs.
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
✓
VXLAN encapsulates Layer 2 frames in UDP packets
VXLAN encapsulates Layer 2 Ethernet frames inside UDP packets (typically UDP destination port 4789). This allows Layer 2 segments to be extended over a Layer 3 IP network, which is the fundamental purpose of VXLAN in a data center fabric.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VXLAN encapsulates Layer 2 frames in UDP packets
Why this is correct
VXLAN uses MAC-in-UDP encapsulation.
- ✗
VNI values range from 1 to 4096
Why it's wrong here
4096 is the VLAN range; VNI is 24-bit.
- ✓
VNI is a 24-bit field in the VXLAN header
Why this is correct
VNI is a 24-bit segment ID.
- ✗
VXLAN uses TCP for encapsulation
Why it's wrong here
VXLAN uses UDP, not TCP.
- ✗
VNI is used only for Layer 3 routing
Why it's wrong here
VNI is used for both Layer 2 and Layer 3.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.