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200-901 Designing a new branch network Practice Question
A company is designing a new branch network. They want to segment traffic into separate broadcast domains to improve security and reduce broadcast traffic. Which technology should be used to achieve this?
⚠ Common exam trap
Cisco often tests the misconception that subnetting alone can create broadcast domains, but subnetting is a Layer 3 concept while VLANs are the Layer 2 technology that actually isolates broadcast traffic at the data link layer.
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
✓
VLANs
VLANs (Virtual Local Area Networks) segment a physical network into multiple logical broadcast domains at Layer 2. By assigning different VLANs to different groups of devices, broadcast traffic is confined to the VLAN, reducing unnecessary propagation and improving security by isolating traffic between segments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Spanning Tree Protocol
Why it's wrong here
Prevents loops, does not segment broadcast domains.
- ✗
Subnetting
Why it's wrong here
Subnetting is Layer 3; broadcast domains are Layer 2.
- ✗
EtherChannel
Why it's wrong here
Bundles links, does not segment.
- ✓
VLANs
Why this is correct
VLANs create separate broadcast domains.
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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.