Quick Answer
The correct answer is Content Security Policy (CSP) with the 'frame-ancestors' directive, as it provides a modern, granular defense against clickjacking by specifying which domains are allowed to embed the page in a frame. This works because clickjacking relies on an attacker loading your site in a hidden iframe to trick users into clicking on invisible elements; CSP's frame-ancestors directive blocks unauthorized framing at the browser level, while the older X-Frame-Options header (with values like DENY or SAMEORIGIN) offers a simpler but less flexible alternative. On the Certified Ethical Hacker CEH exam, this topic tests your understanding of client-side attack mitigation, often appearing in multiple-choice questions that pair CSP with frame-ancestors as the most comprehensive solution. A common trap is confusing CSP's frame-ancestors with the similar-sounding 'frame-src' directive—remember, frame-src controls what the page can load, while frame-ancestors controls who can load the page. For a quick memory tip, think "ancestors are your parents, so frame-ancestors controls who your page's parent frame can be."
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 of the following is a common defense against clickjacking attacks?
CSRF tokens
Why wrong: CSRF tokens protect against CSRF, not clickjacking.
Content Security Policy (CSP) with 'frame-ancestors' directive
CSP 'frame-ancestors' is also effective, but the most common is X-Frame-Options.
SameSite cookies
Why wrong: SameSite cookies protect against CSRF, not clickjacking.
Input validation
Why wrong: Input validation does not prevent clickjacking.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Content Security Policy (CSP) with 'frame-ancestors' directive
The X-Frame-Options header (e.g., DENY or SAMEORIGIN) prevents the page from being displayed in a frame, mitigating clickjacking.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
CSRF tokens
Why it's wrong here
CSRF tokens protect against CSRF, not clickjacking.
Content Security Policy (CSP) with 'frame-ancestors' directive
Why this is correct
CSP 'frame-ancestors' is also effective, but the most common is X-Frame-Options.
Related concept
Standard ACLs match source addresses.
SameSite cookies
Why it's wrong here
SameSite cookies protect against CSRF, not clickjacking.
Input validation
Why it's wrong here
Input validation does not prevent clickjacking.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CEH ACL questions on filtering logic and placement.
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FAQ
Web Application and Injection Attacks — This question tests Web Application and Injection Attacks — Standard ACLs match source addresses..
The correct answer is: Content Security Policy (CSP) with 'frame-ancestors' directive — The X-Frame-Options header (e.g., DENY or SAMEORIGIN) prevents the page from being displayed in a frame, mitigating clickjacking.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CEH ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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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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