200-901 Network Fundamentals Practice Question
A network engineer is tasked with segmenting a large broadcast domain into smaller ones using VLANs. In the OSI model, at which layer does a VLAN operate?
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 tagging frames with VLAN IDs to separate broadcast domains.
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 2 - Data Link
Why this is correct
VLANs work by adding tags to Ethernet frames at Layer 2.
- ✗
Layer 4 - Transport
Why it's wrong here
Transport layer handles segments and ports.
- ✗
Layer 1 - Physical
Why it's wrong here
VLANs are not physical; they are logical segmentation.
- ✗
Layer 3 - Network
Why it's wrong here
Layer 3 deals with IP subnets, but VLANs are Layer 2.
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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.