- A
VXLAN encapsulates Layer 2 frames in UDP packets
VXLAN uses MAC-in-UDP encapsulation.
- B
VNI values range from 1 to 4096
Why wrong: 4096 is the VLAN range; VNI is 24-bit.
- C
VNI is a 24-bit field in the VXLAN header
VNI is a 24-bit segment ID.
- D
VXLAN uses TCP for encapsulation
Why wrong: VXLAN uses UDP, not TCP.
- E
VNI is used only for Layer 3 routing
Why wrong: VNI is used for both Layer 2 and Layer 3.
Question 426 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.
A network engineer is planning a VXLAN EVPN fabric. Which two statements about VXLAN Network Identifiers (VNIs) are correct? (Choose two.)
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
Option A is correct because 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.
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.
- ✓
VXLAN encapsulates Layer 2 frames in UDP packets
Why this is correct
VXLAN uses MAC-in-UDP encapsulation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
VXLAN uses TCP for encapsulation
- ✗
VNI is used only for Layer 3 routing
Why it's wrong here
VNI is used for both Layer 2 and Layer 3.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the VNI range (24-bit vs. 12-bit VLAN ID) to catch candidates who confuse VXLAN VNIs with traditional VLAN IDs.
Detailed technical explanation
How to think about this question
The VNI is a 24-bit field in the VXLAN header (RFC 7348), allowing up to 16 million unique network segments. In EVPN, the VNI is mapped to a Route Distinguisher (RD) and Route Target (RT) for BGP control-plane signaling, enabling multi-tenancy and seamless integration with both bridging (L2VNI) and routing (L3VNI) across the 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 practitioner preparing for the 350-601 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: VXLAN encapsulates Layer 2 frames in UDP packets — Option A is correct because 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.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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