This CS0-003 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.
During a security assessment, you discover that an organization's web application is vulnerable to SQL injection because it concatenates user input directly into SQL queries. Which of the following is the BEST remediation strategy?
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.
Encode all output data.
Why wrong: Relevant for XSS, not SQL injection.
Deploy a web application firewall (WAF).
Why wrong: Compensating control, but does not address the root cause.
Use parameterized queries or prepared statements.
Separates SQL logic from data, preventing injection.
Implement input validation using a whitelist.
Why wrong: Helpful but not sufficient; parameterized queries are the standard defense.
Answer choices
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.
Parameterized queries (prepared statements) separate SQL logic from user data by using placeholders, ensuring that user input is always treated as data, not executable code. This directly prevents SQL injection by eliminating the ability to alter the query structure, regardless of the input content.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Encode all output data.
Why it's wrong here
Relevant for XSS, not SQL injection.
Deploy a web application firewall (WAF).
Why it's wrong here
Compensating control, but does not address the root cause.
Use parameterized queries or prepared statements.
Why this is correct
Separates SQL logic from data, preventing injection.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Implement input validation using a whitelist.
Why it's wrong here
Helpful but not sufficient; parameterized queries are the standard defense.
Common exam traps
Cisco often tests the misconception that input validation or a WAF is sufficient to prevent SQL injection, but the exam expects you to recognize that only parameterized queries/prepared statements address the root cause by enforcing data vs. code separation.
Detailed technical explanation
Under the hood, parameterized queries compile the SQL statement with placeholders (e.g., `?` in ODBC/JDBC or `$1` in PostgreSQL) before any user data is bound. The database engine then treats the bound values strictly as literals, never as SQL keywords or operators. A real-world scenario: even if an attacker inputs `' OR 1=1 --`, the parameterized query will treat it as a string literal to compare, not as a logical condition, because the query structure is already fixed at compile time.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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FAQ
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
The correct answer is: Use parameterized queries or prepared statements. — Parameterized queries (prepared statements) separate SQL logic from user data by using placeholders, ensuring that user input is always treated as data, not executable code. This directly prevents SQL injection by eliminating the ability to alter the query structure, regardless of the input content.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This CS0-003 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 CS0-003 exam.
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