easyMultiple ChoiceObjective-mapped
ISC2 CC Practice Question: Has multiple network segments for accounting, HR,…
An organization has multiple network segments for accounting, HR, and engineering. They want to prevent unauthorized traffic between segments while allowing necessary communication. Which security control should be implemented?
⚠ Common exam trap
ISC2 often tests the distinction between passive detection (IDS) and active prevention (firewall/ACL), so candidates mistakenly choose IDS thinking it blocks traffic, but it only alerts.
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
✓
VLAN segmentation with ACLs
VLAN segmentation with ACLs is the correct choice because VLANs create separate broadcast domains at Layer 2, isolating traffic between network segments (accounting, HR, engineering). ACLs applied to the Layer 3 interface (SVI) or trunk ports then enforce granular rules to permit only necessary inter-VLAN communication, such as allowing HR to access a shared server while blocking all other cross-segment traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VLAN segmentation with ACLs
Why this is correct
VLANs logically segment networks, and ACLs enforce traffic rules between them, achieving the desired control.
- ✗
Intrusion Detection System (IDS)
Why it's wrong here
An IDS monitors for attacks but does not control traffic between segments.
- ✗
Proxy server
Why it's wrong here
A proxy server mediates traffic but does not segment internal networks.
- ✗
Honeypot
Why it's wrong here
A honeypot is a decoy system, not a traffic control mechanism.
Visual reference
Go deeper
Related to this question
Learn chapter
Introduction to Security Principles
Key term
Security control
A security control is a safeguard or countermeasure designed to protect the confidentiality, integrity, and availability of information systems and data.
Key term
Organization
An Organization is a top-level container in Google Cloud that represents your company or entities and serves as the root node for all your cloud resources, policies, and access control.
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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.