ISC2 CC Network Security Practice Question
An organization wants to implement network segmentation to improve security. Which three methods are commonly used for network segmentation? (Select THREE.)
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
✓
Subnetting
VLANs, subnets, and DMZs are common segmentation methods. Firewalls enforce rules but are not segmentation methods themselves; IDS is a monitoring tool.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Subnetting
Why this is correct
Subnetting divides IP address space.
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DMZs
Why this is correct
DMZs (Demilitarised Zones) are a fundamental method for network segmentation, specifically designed to host public-facing services like web or email servers. They create an isolated buffer network between an untrusted external network (e.g., the internet) and the organisation's trusted internal network. This isolation, enforced by firewalls, significantly improves security by preventing direct access to internal resources if a DMZ server is compromised, thereby satisfying the scenario's goal.
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Firewalls
Why it's wrong here
Firewalls control traffic but are not a segmentation method.
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VLANs
Why this is correct
VLANs logically separate networks on a switch.
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Intrusion Detection Systems
Why it's wrong here
IDS monitors traffic but does not segment.
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Related to this question
Learn chapter
Introduction to Security Principles
Key term
Network segmentation
Network segmentation is the practice of dividing a computer network into smaller, isolated parts to improve performance, contain security threats, and simplify management.
Key term
IDS
An IDS is a security system that monitors network or system traffic for suspicious activity and alerts administrators to potential threats, but does not actively block them.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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