The correct answers are reduced attack surface and containment of breaches. Network segmentation divides a network into smaller, isolated zones, which directly limits the scope of an attacker’s movement; if one segment is compromised, the breach cannot easily spread to others, thereby containing the damage and shrinking the overall attack surface. On the ISC2 Certified in Cybersecurity CC exam, this concept tests your understanding of core security architecture principles—specifically how segmentation supports the principle of least privilege and defense in depth. A common trap is confusing increased broadcast domains with a security benefit, but remember that more broadcast domains can degrade performance and are not a primary security goal. For a quick memory tip, think of segmentation as “fire doors on a ship”: they don’t stop a fire from starting, but they keep it from sinking the whole vessel.
ISC2 CC Network Security Practice Question
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 TWO of the following are recognized as benefits of network segmentation?
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
Option A (Reduced attack surface) and Option D (Containment of breaches) are correct. Segmentation limits the scope of attacks and reduces exposure. Option B (Increased broadcast domains) is not a security benefit; it can cause performance issues. Option C (Simplified IP address management) is not directly related to security. Option E (Easier monitoring) is subjective and not a primary benefit.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
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
Segmentation limits access to sensitive resources, reducing the attack surface.
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CC subnetting questions on CIDR, address ranges, and subnet selection.
Network Security — This question tests Network Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Reduced attack surface — Option A (Reduced attack surface) and Option D (Containment of breaches) are correct. Segmentation limits the scope of attacks and reduces exposure. Option B (Increased broadcast domains) is not a security benefit; it can cause performance issues. Option C (Simplified IP address management) is not directly related to security. Option E (Easier monitoring) is subjective and not a primary benefit.
What should I do if I get this CC question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CC subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which of the following is a primary benefit of implementing network segmentation?
easy
✓ A.Reduced attack surface
B.Eliminates the need for firewalls
C.Increased bandwidth
D.Simplified IP address management
Why A: 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.
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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.
Question Discussion
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