Quick Answer
The answer is a combination of a web application firewall (WAF), input validation, and security logging. This trio achieves defense-in-depth for web application layer controls by layering detection, prevention, and response: the WAF detects and blocks known attack patterns at the perimeter, input validation prevents malicious data from being processed by the application itself, and security logging provides the monitoring and forensic capability needed to detect and respond to incidents that bypass the other layers. On the CISM exam, this question tests your understanding that true depth requires overlapping, heterogeneous controls rather than relying on a single mechanism like encryption or patching alone. A common trap is choosing an IDS-only option, which provides detection without prevention, or selecting encryption, which protects data at rest or in transit but does not stop an injection attack. Remember the mnemonic DPR: Detect (WAF), Prevent (input validation), Respond (logging) — if any one of these is missing, the depth is broken.
This CISM practice question tests your understanding of information security program. 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.
A global e-commerce company is designing its information security program. The CISO wants to implement a defense-in-depth strategy for the web application layer. Which combination of controls best achieves this objective?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
SSL/TLS encryption and VPN access
Why wrong: Focuses on transmission security, not application-level.
Web application firewall (WAF) and intrusion detection system (IDS)
Why wrong: Lacks preventive controls like input validation.
WAF, input validation, and security logging
Combines prevention, detection, and monitoring.
Regular patching and vulnerability scanning
Why wrong: Primarily maintenance, not defense layers.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
WAF, input validation, and security logging
Option B is correct because defense-in-depth requires multiple layers of controls: detection (WAF), prevention (input validation), and response (monitoring). Option A is wrong as IDS alone is detection only. Option C is wrong as patching is a single layer. Option D is wrong as encryption provides confidentiality but not attack prevention.
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.
SSL/TLS encryption and VPN access
Why it's wrong here
Focuses on transmission security, not application-level.
Web application firewall (WAF) and intrusion detection system (IDS)
Why it's wrong here
Lacks preventive controls like input validation.
WAF, input validation, and security logging
Why this is correct
Combines prevention, detection, and monitoring.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Regular patching and vulnerability scanning
Why it's wrong here
Primarily maintenance, not defense layers.
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 CISM NAT questions on configuration and troubleshooting.
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FAQ
Information Security Program — This question tests Information Security Program — Static NAT maps one inside address to one outside address..
The correct answer is: WAF, input validation, and security logging — Option B is correct because defense-in-depth requires multiple layers of controls: detection (WAF), prevention (input validation), and response (monitoring). Option A is wrong as IDS alone is detection only. Option C is wrong as patching is a single layer. Option D is wrong as encryption provides confidentiality but not attack prevention.
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 CISM NAT questions on configuration and troubleshooting.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
This CISM practice question is part of Courseiva's free ISACA 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 CISM exam.
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