This CC practice question tests your understanding of network security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which of the following is a primary benefit of implementing network segmentation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Reduced attack surface
Limits scope of attacks.
Eliminates the need for firewalls
Why wrong: Firewalls are still needed between segments.
Increased bandwidth
Why wrong: Segmentation does not increase bandwidth.
Simplified IP address management
Why wrong: May complicate management.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Reduced attack surface
Network segmentation divides a network into smaller, isolated segments, which limits an attacker's ability to move laterally after compromising a single host. By restricting traffic between segments using VLANs, ACLs, or firewall rules, the attack surface is reduced because fewer systems are exposed to potential threats. This is a primary security benefit, as it contains breaches and minimizes the impact of malware or unauthorized access.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Reduced attack surface
Why this is correct
Limits scope of attacks.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Eliminates the need for firewalls
Why it's wrong here
Firewalls are still needed between segments.
Increased bandwidth
Why it's wrong here
Segmentation does not increase bandwidth.
Simplified IP address management
Why it's wrong here
May complicate management.
Common exam traps
ISC2 often tests the misconception that segmentation eliminates the need for firewalls, but in reality, segmentation and firewalls are complementary—firewalls enforce the segmentation policy, and segmentation reduces the attack surface by limiting exposure.
Detailed technical explanation
Under the hood, segmentation is commonly implemented using VLANs (802.1Q) at Layer 2, with inter-VLAN routing performed by a router or Layer 3 switch, where ACLs or firewall rules control traffic flow. In a real-world scenario, a PCI DSS environment segments the cardholder data environment from the corporate network, ensuring that even if an employee workstation is compromised, the attacker cannot directly reach payment systems. This containment is achieved by default-deny rules between segments, reducing the blast radius of an incident.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
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FAQ
Network Security — This question tests Network Security — Read the scenario before looking for a memorised answer..
The correct answer is: Reduced attack surface — Network segmentation divides a network into smaller, isolated segments, which limits an attacker's ability to move laterally after compromising a single host. By restricting traffic between segments using VLANs, ACLs, or firewall rules, the attack surface is reduced because fewer systems are exposed to potential threats. This is a primary security benefit, as it contains breaches and minimizes the impact of malware or unauthorized access.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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