This NSE7 practice question tests your understanding of advanced threat protection. 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 FortiGate administrator wants to block a custom protocol anomaly where a client sends an HTTP request with a malformed header containing a null byte. Which advanced IPS feature should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Protocol Anomaly Detection in the IPS sensor
Protocol Anomaly Detection in the IPS sensor is designed to identify deviations from standard protocol behavior, such as malformed headers or null bytes in HTTP requests. This feature inspects traffic for known protocol violations without requiring custom signatures, making it the correct choice for blocking a null byte anomaly in HTTP headers.
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.
✗
Create a custom IPS signature to match the null byte pattern
Why it's wrong here
Custom signatures are specific; protocol anomaly detection is a separate engine.
✗
Enable 'Outbreak Prevention' in the IPS sensor
Why it's wrong here
Outbreak Prevention is for fast-spreading threats, not protocol anomalies.
✗
Use the 'http-policy' setting in the WAF profile
Why it's wrong here
WAF handles web attacks, not protocol anomalies at the TCP/IP level.
✓
Enable Protocol Anomaly Detection in the IPS sensor
Why this is correct
Protocol anomaly detection identifies malformed packets that violate protocol standards.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse custom IPS signatures with protocol anomaly detection, assuming any pattern match requires a signature, when in fact FortiGate's IPS engine includes built-in protocol decoders that automatically detect RFC violations like null bytes.
Detailed technical explanation
How to think about this question
Protocol Anomaly Detection in FortiGate's IPS engine works by comparing traffic against RFC-defined protocol standards (e.g., RFC 7230 for HTTP/1.1). A null byte in an HTTP header violates the protocol specification because headers must be ASCII text and null bytes are used for string termination in C-based systems, potentially indicating an injection attempt. This feature can be fine-tuned with thresholds and actions (e.g., block, reset) per protocol, and it is part of the IPS sensor's 'Protocol Decoder' settings.
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 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.
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.
Advanced Threat Protection — This question tests Advanced Threat Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Protocol Anomaly Detection in the IPS sensor — Protocol Anomaly Detection in the IPS sensor is designed to identify deviations from standard protocol behavior, such as malformed headers or null bytes in HTTP requests. This feature inspects traffic for known protocol violations without requiring custom signatures, making it the correct choice for blocking a null byte anomaly in HTTP headers.
What should I do if I get this NSE7 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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Question Discussion
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