The correct answer is output encoding and Content Security Policy (CSP). Output encoding, often called output escaping, neutralizes XSS by converting special characters like < and > into their harmless HTML entities before the browser renders them, ensuring user-supplied data is treated as text rather than executable code. CSP complements this by acting as a browser-level defense that restricts which scripts can run, blocking inline scripts and unauthorized sources even if malicious input slips through. On the Systems Security Certified Practitioner SSCP exam, this question tests your understanding that XSS prevention must occur at the application layer—not through transport security like HTTPS or network tools like WAFs. A common trap is confusing encryption with sanitization; remember that HTTPS protects data in transit, not from injection. For a quick memory tip, think “Encode and Block” — encode all output, and block unauthorized scripts with CSP.
SSCP Systems and Application Security Practice Question
This SSCP practice question tests your understanding of systems and application security. 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 measures to prevent cross-site scripting (XSS) vulnerabilities in a web application?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement a Content Security Policy (CSP).
Options B and C are correct because output encoding prevents XSS by neutralizing script payloads, and Content Security Policy (CSP) provides a browser-level defense that restricts script execution. Option A is incorrect because HTTPS only encrypts data in transit, not preventing XSS. Option D is incorrect because WAFs can block some XSS attempts but are not a prevention measure at the application level. Option E is incorrect because HTTP method does not affect XSS.
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.
✓
Implement a Content Security Policy (CSP).
Why this is correct
CSP restricts sources of executable scripts, mitigating XSS even if injection occurs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a web application firewall (WAF) to block known XSS payloads.
Why it's wrong here
WAFs provide detection and blocking but are not a code-level prevention.
✗
Replace GET requests with POST for all form submissions.
Why it's wrong here
HTTP method does not impact XSS; both GET and POST can carry malicious data.
✓
Encode all user input before displaying it in HTTP responses.
Why this is correct
Output encoding ensures that user-supplied data is treated as text, not executable code.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use HTTPS for all communications.
Why it's wrong here
HTTPS ensures confidentiality, not prevention of XSS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
What to study next
Got this wrong? Here's your next step.
Identify which SSCP 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.
Systems and Application Security — This question tests Systems and Application Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement a Content Security Policy (CSP). — Options B and C are correct because output encoding prevents XSS by neutralizing script payloads, and Content Security Policy (CSP) provides a browser-level defense that restricts script execution. Option A is incorrect because HTTPS only encrypts data in transit, not preventing XSS. Option D is incorrect because WAFs can block some XSS attempts but are not a prevention measure at the application level. Option E is incorrect because HTTP method does not affect XSS.
What should I do if I get this SSCP question wrong?
Identify which SSCP 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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