This CAS-004 practice question tests your understanding of security architecture. 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 company is designing a secure web application that processes credit card payments. The architect needs to ensure that the application is resilient against SQL injection attacks. Which of the following is the most effective defense?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use parameterized queries or prepared statements for all database interactions.
Parameterized queries (prepared statements) are the most effective defense against SQL injection because they separate SQL logic from user-supplied data at the database driver level. This ensures that user input is always treated as a literal value, never as executable SQL code, regardless of any malicious content. This approach directly prevents the attacker from altering the query structure, which is the root cause of SQL injection.
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.
✗
Use stored procedures exclusively for database access.
Why it's wrong here
Stored procedures can still be vulnerable if they concatenate input.
✗
Deploy a web application firewall (WAF) with SQL injection rules.
Why it's wrong here
WAFs provide defense in depth but can be bypassed; not the most effective standalone defense.
✓
Use parameterized queries or prepared statements for all database interactions.
Why this is correct
Parameterized queries ensure data is treated as data, effectively preventing SQL injection.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement client-side input validation and sanitize all user input.
Why it's wrong here
Client-side validation is easily bypassed; server-side sanitization may still have flaws.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose stored procedures (Option A) thinking they are inherently safe, but Cisco tests the nuance that stored procedures are only safe if they use parameterized queries internally, not if they concatenate input into dynamic SQL.
Detailed technical explanation
How to think about this question
Under the hood, parameterized queries work by sending the SQL statement template and the parameters separately to the database server. The database engine compiles the template into a prepared statement, then binds the parameters as data, not code. This means even if a user inputs ' OR 1=1 --, it is treated as a string literal, not as part of the SQL syntax. In real-world scenarios, this is critical for applications using dynamic queries in languages like Java (PreparedStatement), Python (cursor.execute with placeholders), or .NET (SqlCommand with parameters).
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 practitioner preparing for the CAS-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Architecture — This question tests Security Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use parameterized queries or prepared statements for all database interactions. — Parameterized queries (prepared statements) are the most effective defense against SQL injection because they separate SQL logic from user-supplied data at the database driver level. This ensures that user input is always treated as a literal value, never as executable SQL code, regardless of any malicious content. This approach directly prevents the attacker from altering the query structure, which is the root cause of SQL injection.
What should I do if I get this CAS-004 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.