The answer is a web application firewall (WAF) placed in front of the application. This control is the best fit because it operates at Layer 7, inspecting and filtering HTTP/HTTPS traffic to block malicious payloads like SQL injection and cross-site scripting (XSS) before they ever reach the application server, all without requiring any code changes to the app itself. On the Security+ SY0-701 exam, this scenario tests your ability to distinguish between network-layer controls, such as a traditional firewall or IPS, and application-layer controls; a common trap is confusing a WAF with a network firewall, which cannot inspect HTTP payloads. Remember that a WAF is purpose-built for HTTP attack prevention, while an IPS typically focuses on network-level threats. A helpful memory tip: think of a WAF as a “bouncer for web traffic” that checks IDs at the application door, not just at the building entrance.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. 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.
A company is placing a customer-facing web application behind a new security control. The team wants to block malicious HTTP requests such as injection attempts before they reach the application server, with minimal code changes to the app itself. Which control is the best fit?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Web application firewall (WAF) in front of the application.
A web application firewall (WAF) is specifically designed to inspect and filter HTTP/HTTPS traffic at the application layer (Layer 7), blocking malicious payloads such as SQL injection and cross-site scripting (XSS) before they reach the web server. It operates without requiring changes to the application code, making it the ideal choice for this scenario.
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.
✗
Network access control (NAC) at the switch port.
Why it's wrong here
NAC checks device posture and admission to the network, but it does not inspect web requests for application-layer attacks.
✓
Web application firewall (WAF) in front of the application.
Why this is correct
A WAF inspects HTTP traffic and can block common web exploits without requiring changes to the application code.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Data loss prevention (DLP) on the email gateway.
Why it's wrong here
DLP is meant to identify and stop sensitive data leakage, not to filter hostile web requests going to a server.
✗
Endpoint detection and response (EDR) on the web server only.
Why it's wrong here
EDR helps detect malicious activity on endpoints, but it does not provide inline protection for inbound HTTP request filtering.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a WAF with a network firewall or NAC, thinking any 'security control' placed in front of a server can block application-layer attacks, but only a WAF operates at Layer 7 with HTTP-specific inspection capabilities.
Detailed technical explanation
How to think about this question
A WAF uses a combination of signature-based detection (e.g., OWASP ModSecurity Core Rule Set), anomaly-based heuristics, and positive security models (allowlisting) to parse HTTP request parameters, headers, and cookies for malicious patterns. In a real-world scenario, a WAF can also perform protocol validation (e.g., enforcing RFC 7230 compliance) and rate limiting to mitigate DDoS attacks, all without modifying the application's source code.
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.
TExam Day Tips
→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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Web application firewall (WAF) in front of the application. — A web application firewall (WAF) is specifically designed to inspect and filter HTTP/HTTPS traffic at the application layer (Layer 7), blocking malicious payloads such as SQL injection and cross-site scripting (XSS) before they reach the web server. It operates without requiring changes to the application code, making it the ideal choice for this scenario.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A public web application is seeing bursts of requests that contain SQL metacharacters, encoded script tags, and attempts to POST to administrative endpoints. The team wants a control that can inspect HTTP traffic and block the malicious requests before they reach the app. What should be deployed?
medium
✓ A.A web application firewall in front of the application
B.An endpoint detection and response agent on the web server only
C.A data loss prevention rule on the email gateway
D.A network access control system for user authentication
Why A: A web application firewall (WAF) is specifically designed to inspect HTTP/HTTPS traffic at the application layer (Layer 7), analyzing request payloads for SQL metacharacters, encoded script tags (XSS), and unauthorized POST attempts to administrative endpoints. By deploying a WAF in front of the web application, malicious traffic is filtered and blocked before it reaches the application server, providing a proactive security control against common web attacks such as SQL injection and cross-site scripting.
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This SY0-701 practice question is part of Courseiva's free CompTIA 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 SY0-701 exam.
Question Discussion
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