Quick Answer
The answer is application whitelisting and module disablement, as this practice directly supports reducing attack surface through web server hardening by ensuring only necessary modules are enabled. When you disable unused services and modules, you eliminate potential entry points that attackers could exploit, which is the core principle of attack surface reduction. On the CompTIA SecurityX CAS-004 exam, this concept tests your understanding of server hardening controls, often appearing in scenario-based questions where you must distinguish between proactive reduction (disabling modules) and reactive measures like patching or backup strategies. A common trap is confusing module disablement with patch management—remember that patching fixes known vulnerabilities but does not shrink the attack surface, whereas disabling modules removes entire vectors. Memory tip: “Disable to disable the attacker”—if it’s not needed, turn it off.
This CAS-004 practice question tests your understanding of security operations. 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.
An organization wants to reduce the attack surface of its web servers by ensuring only necessary modules are enabled. Which practice directly supports this goal?
Patch management
Why wrong: Patching fixes vulnerabilities but does not reduce the number of enabled modules.
Application whitelisting and module disablement
Whitelisting and disabling unnecessary modules reduce attack surface.
Regular backups
Why wrong: Backups help with recovery, not attack surface reduction.
Multi-factor authentication
Why wrong: MFA improves authentication security but does not reduce the attack surface of the server.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Application whitelisting and module disablement
Option A is correct because hardening includes disabling unnecessary services and modules. Option B is about patching, not reducing attack surface directly. Option C is backup strategy. Option D is about authentication, not module reduction.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Patch management
Why it's wrong here
Patching fixes vulnerabilities but does not reduce the number of enabled modules.
Application whitelisting and module disablement
Why this is correct
Whitelisting and disabling unnecessary modules reduce attack surface.
Related concept
Static NAT maps one inside address to one outside address.
Regular backups
Why it's wrong here
Backups help with recovery, not attack surface reduction.
Multi-factor authentication
Why it's wrong here
MFA improves authentication security but does not reduce the attack surface of the server.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
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FAQ
Security Operations — This question tests Security Operations — Static NAT maps one inside address to one outside address..
The correct answer is: Application whitelisting and module disablement — Option A is correct because hardening includes disabling unnecessary services and modules. Option B is about patching, not reducing attack surface directly. Option C is backup strategy. Option D is about authentication, not module reduction.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
This CAS-004 practice question is part of Courseiva's free CompTIA 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 CAS-004 exam.
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