The answer is setting the X-Frame-Options header to DENY and using the Content-Security-Policy frame-ancestors directive. These two techniques are effective mitigations against Clickjacking because they instruct the browser to refuse loading the page within a frame or iframe, thereby preventing an attacker from overlaying a transparent, malicious layer on top of a legitimate site. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of HTTP security headers and client-side defense mechanisms, often appearing in questions about web application vulnerabilities and countermeasures. A common trap is confusing frame-ancestors with the older frame-src directive, which controls allowed sources for frames rather than preventing framing altogether. Remember the mnemonic “DENY all ancestors” to recall that both X-Frame-Options: DENY and CSP frame-ancestors 'none' block all framing, making them the go-to clickjacking mitigations.
CEH Web Application and Injection Attacks Practice Question
This CEH practice question tests your understanding of web application and injection attacks. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 effective mitigations against Clickjacking attacks? (Choose 2)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set Content-Security-Policy: frame-ancestors 'none'
X-Frame-Options header and Content-Security-Policy frame-ancestors directive are both effective against 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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Set Content-Security-Policy: frame-ancestors 'none'
Why this is correct
CSP frame-ancestors controls which domains can embed the page.
Related concept
Standard ACLs match source addresses.
✗
Use CSRF tokens
Why it's wrong here
CSRF tokens mitigate CSRF, not clickjacking.
✓
Set X-Frame-Options: DENY
Why this is correct
This header prevents the page from being loaded in a frame.
Related concept
Standard ACLs match source addresses.
✗
Set SameSite cookies to Strict
Why it's wrong here
SameSite cookies mitigate CSRF, not clickjacking.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
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
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
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.
Web Application and Injection Attacks — This question tests Web Application and Injection Attacks — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Set Content-Security-Policy: frame-ancestors 'none' — X-Frame-Options header and Content-Security-Policy frame-ancestors directive are both effective against clickjacking.
What should I do if I get this CEH question wrong?
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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