CISSP Security Architecture and Engineering Practice Question
This CISSP practice question tests your understanding of security architecture and engineering. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
SecRuleEngine On
SecRequestBodyAccess On
SecRule REQUEST_URI "/login" "phase:2,deny,msg:'Login attempt detected'"
A security analyst is troubleshooting a web application that is incorrectly blocking valid login requests. The WAF rule in the exhibit is the only rule configured. What is the probable issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The rule is too generic and matches all login requests
Option C is correct because the WAF rule uses a broad pattern like `.*` or similar regex that matches all login request parameters, causing the WAF to block every login attempt. This occurs when the rule lacks specific constraints (e.g., matching only known attack patterns like SQL injection or XSS), so it incorrectly flags legitimate traffic as malicious.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The rule uses outdated syntax
Why it's wrong here
Incorrect. The syntax is standard for ModSecurity.
✗
The rule is in the wrong phase
Why it's wrong here
Incorrect. Phase 2 is appropriate for request URI inspection.
✓
The rule is too generic and matches all login requests
Why this is correct
Correct. The rule denies all requests to '/login' without any additional conditions.
Related concept
Read the scenario before looking for a memorised answer.
✗
The rule does not specify a status code
Why it's wrong here
Incorrect. The rule will still deny with default status.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a rule being 'too generic' with 'outdated syntax' or 'wrong phase,' but the key is recognizing that a pattern matching everything causes false positives, not a technical failure of the rule engine.
Detailed technical explanation
How to think about this question
WAF rules often use regex patterns to detect malicious payloads; a rule like `.*` in a parameter value field matches any string, including benign credentials. In practice, this can happen when a rule is intended to block specific attack signatures but is misconfigured with an overly permissive pattern, leading to false positives. Real-world scenarios include ModSecurity CRS rules where a missing `ctl:requestBodyProcessor=URLENCODED` directive can cause the rule to match all POST data.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Security Architecture and Engineering — This question tests Security Architecture and Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The rule is too generic and matches all login requests — Option C is correct because the WAF rule uses a broad pattern like `.*` or similar regex that matches all login request parameters, causing the WAF to block every login attempt. This occurs when the rule lacks specific constraints (e.g., matching only known attack patterns like SQL injection or XSS), so it incorrectly flags legitimate traffic as malicious.
What should I do if I get this CISSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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