- A
IDS, because it alerts on suspicious traffic without affecting application delivery.
Why wrong: An IDS can detect attacks, but it typically does not sit in the request path to block them.
- B
WAF, because it understands web requests and can block malicious application-layer traffic.
A web application firewall is designed to inspect HTTP and HTTPS traffic and stop common web attacks before they reach the app.
- C
DLP, because it can stop sensitive data from being posted to the portal.
Why wrong: DLP focuses on protecting data from unauthorized movement, not inspecting and blocking malicious web requests.
- D
NAC, because it verifies whether devices are allowed onto the network.
Why wrong: NAC controls network admission for endpoints, not the content of HTTP requests sent to a web application.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 web team is moving a customer portal behind a new inspection device. They need something that can examine HTTP requests, block malicious patterns like injection attempts, and still allow normal browsing. Which control is most appropriate?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
WAF, because it understands web requests and can block malicious application-layer traffic.
A WAF (Web Application Firewall) is the correct choice because it operates at Layer 7 (application layer) and is specifically designed to inspect HTTP/HTTPS traffic. It can parse web requests, identify malicious patterns such as SQL injection or XSS payloads, and block them while allowing legitimate traffic to pass through to the customer portal.
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.
- ✗
IDS, because it alerts on suspicious traffic without affecting application delivery.
Why it's wrong here
An IDS can detect attacks, but it typically does not sit in the request path to block them.
- ✓
WAF, because it understands web requests and can block malicious application-layer traffic.
- ✗
DLP, because it can stop sensitive data from being posted to the portal.
Why it's wrong here
DLP focuses on protecting data from unauthorized movement, not inspecting and blocking malicious web requests.
- ✗
NAC, because it verifies whether devices are allowed onto the network.
Why it's wrong here
NAC controls network admission for endpoints, not the content of HTTP requests sent to a web application.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse an IDS with an IPS (Intrusion Prevention System) and assume an IDS can block traffic, but an IDS is passive and only generates alerts, whereas a WAF is an active, inline control that can both detect and block application-layer attacks.
Detailed technical explanation
How to think about this question
A WAF uses a combination of signature-based detection (e.g., regex patterns for SQL injection like ' OR 1=1 --) and behavioral analysis (e.g., anomaly scoring for unusual request sizes or parameter lengths) to filter traffic. In a real-world scenario, a WAF can be deployed in reverse proxy mode, terminating TLS and inspecting decrypted HTTP requests before forwarding them to the backend, which is critical for portals handling sensitive customer data.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SY0-701 question test?
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: WAF, because it understands web requests and can block malicious application-layer traffic. — A WAF (Web Application Firewall) is the correct choice because it operates at Layer 7 (application layer) and is specifically designed to inspect HTTP/HTTPS traffic. It can parse web requests, identify malicious patterns such as SQL injection or XSS payloads, and block them while allowing legitimate traffic to pass through to the customer portal.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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