200-901 Network Fundamentals Practice Question
A network administrator configures a switch port to belong to VLAN 10. Which OSI layer is primarily involved in VLAN tagging?
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
✓
Layer 2 (Data Link)
VLANs operate at Layer 2 (Data Link) by adding tags to Ethernet frames.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Layer 1 (Physical)
Why it's wrong here
Physical layer does not understand VLAN tags.
- ✗
Layer 3 (Network)
Why it's wrong here
Layer 3 operates on packets, not frames.
- ✓
Layer 2 (Data Link)
Why this is correct
VLAN tagging is a Layer 2 function using IEEE 802.1Q.
- ✗
Layer 4 (Transport)
Why it's wrong here
Transport layer is above switching.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.