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ISC2 CC Practice Question: Segment its network into separate broadcast…
A company wants to segment its network into separate broadcast domains to improve performance and security. Which device should be used to achieve this?
⚠ Common exam trap
ISC2 often tests the misconception that a switch with VLANs can create separate broadcast domains, but the trap is that a switch alone (without a Layer 3 device) cannot route between those VLANs—it still requires a router to forward traffic between broadcast domains.
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
✓
Router
A router is the correct device because it operates at Layer 3 (Network layer) of the OSI model and can segment a network into separate broadcast domains by forwarding packets based on IP addresses while blocking broadcast traffic (e.g., ARP requests) from crossing between interfaces. This isolation improves performance by reducing broadcast overhead and enhances security by controlling traffic flow 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.
- ✗
Switch
Why it's wrong here
Switches operate at Layer 2 and segment collision domains but not broadcast domains.
- ✗
Hub
Why it's wrong here
Hubs operate at Layer 1 and do not segment broadcast domains.
- ✗
Repeater
Why it's wrong here
Repeaters amplify signals and do not segment broadcast domains.
- ✓
Router
Why this is correct
Routers segment broadcast domains by forwarding packets based on IP addresses.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 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 CC exam.