350-601 Network Practice Question
In a VXLAN overlay, which encapsulation is used to transport Ethernet frames over the IP network?
⚠ Common exam trap
Cisco often tests the misconception that VXLAN uses GRE or TCP encapsulation because of its tunneling nature, but the key is that VXLAN specifically uses UDP to allow stateless, scalable overlay transport and to leverage existing IP routing without TCP's connection overhead.
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
✓
UDP
VXLAN uses UDP encapsulation (destination port 4789 by default) to transport Layer 2 Ethernet frames over a Layer 3 IP network. This allows the overlay to leverage existing IP routing infrastructure while preserving the original MAC addresses and VLAN information, enabling network virtualization and scalability beyond traditional VLAN limits.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IPsec
Why it's wrong here
IPsec is not used for VXLAN encapsulation.
- ✗
TCP
Why it's wrong here
TCP is not used for VXLAN.
- ✗
GRE
Why it's wrong here
GRE is not used for VXLAN.
- ✓
UDP
Why this is correct
VXLAN uses UDP (port 4789).
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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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.