Quick Answer
The answer is blind boolean-based and union-based, as these are two distinct categories of SQL injection recognized in the CEH exam. Blind boolean-based SQL injection is a type of blind SQLi where an attacker sends queries that force the database to return a true or false response, allowing data extraction without direct output, while union-based SQL injection is an in-band technique that uses the UNION SQL operator to combine results from multiple SELECT statements into a single HTTP response. On the Certified Ethical Hacker exam, this question tests your ability to differentiate between in-band, blind, and out-of-band injection methods—a common trap is confusing error-based (in-band) with boolean-based (blind). A reliable memory tip is to remember that “blind” techniques (boolean and time-based) rely on inference, not direct data display, whereas “union” and “error” are in-band because they deliver results through the same channel.
This CEH practice question tests your understanding of web application and injection attacks. 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.
Which TWO of the following are types of SQL injection? (Select 2)
Stored
Why wrong: Stored is a type of XSS, not SQL injection.
DOM-based
Why wrong: DOM-based is a type of XSS, not SQL injection.
Union-based
Union-based is an in-band technique.
Blind boolean-based
Boolean-based is a blind SQL injection type.
Reflected
Why wrong: Reflected is a type of XSS, not SQL injection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Union-based
In-band SQL injection includes union-based and error-based. Blind SQL injection includes boolean-based and time-based. Out-of-band is another type.
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.
Stored
Why it's wrong here
Stored is a type of XSS, not SQL injection.
DOM-based
Why it's wrong here
DOM-based is a type of XSS, not SQL injection.
Union-based
Why this is correct
Union-based is an in-band technique.
Related concept
Read the scenario before looking for a memorised answer.
Blind boolean-based
Why this is correct
Boolean-based is a blind SQL injection type.
Related concept
Read the scenario before looking for a memorised answer.
Reflected
Why it's wrong here
Reflected is a type of XSS, not SQL injection.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CEH 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
Identify which CEH exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Web Application and Injection Attacks — This question tests Web Application and Injection Attacks — Read the scenario before looking for a memorised answer..
The correct answer is: Union-based — In-band SQL injection includes union-based and error-based. Blind SQL injection includes boolean-based and time-based. Out-of-band is another type.
Identify which CEH exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
This CEH practice question is part of Courseiva's free EC-Council 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 CEH exam.
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