The correct answer is to implement Content Security Policy (CSP) headers on the web server. CSP is a browser security feature that acts as a whitelist, instructing the browser to only execute scripts from trusted sources and automatically blocking inline scripts or malicious payloads, which directly mitigates cross-site scripting (XSS) attacks. On the CompTIA A+ Core 2 220-1202 exam, this question tests your understanding of advanced browser-based defenses beyond basic patching—a common trap is confusing CSP with unrelated options like disabling JavaScript or using antivirus software. Remember, CSP is a proactive header, not a reactive scan. For a quick memory tip: think “CSP = Content Script Protector,” where the server tells the browser exactly which scripts are safe to run, buying time while developers patch the vulnerable application.
220-1102 Browser and Application Security Practice Question
This 220-1202 practice question tests your understanding of browser 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.
A company uses a web application for internal communication. A security audit reveals that the application is vulnerable to cross-site scripting (XSS). Which browser security feature can help mitigate the risk for users while the application is being patched?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement Content Security Policy (CSP) headers on the web server
Content Security Policy (CSP) is a browser security mechanism that can block malicious scripts, reducing XSS impact. This tests advanced knowledge of browser security features. Other options are either unrelated or less effective against XSS.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enable pop-up blocker
Why it's wrong here
Pop-up blockers stop unwanted windows but do not prevent script injection in the page.
✗
Configure the browser to use a proxy server
Why it's wrong here
A proxy can filter traffic but does not specifically block XSS attacks.
✓
Implement Content Security Policy (CSP) headers on the web server
Why this is correct
CSP allows the server to specify which scripts are allowed, preventing execution of injected scripts.
Related concept
Static NAT maps one inside address to one outside address.
✗
Disable JavaScript in the browser
Why it's wrong here
Disabling JavaScript breaks most web applications and is not a practical mitigation.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1202 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1202 NAT questions on configuration and troubleshooting.
Browser and Application Security — This question tests Browser and Application Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Implement Content Security Policy (CSP) headers on the web server — Content Security Policy (CSP) is a browser security mechanism that can block malicious scripts, reducing XSS impact. This tests advanced knowledge of browser security features. Other options are either unrelated or less effective against XSS.
What should I do if I get this 220-1202 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1202 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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