This NSE4 practice question tests your understanding of security profiles. 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 wants to block all peer-to-peer file sharing applications on the network. Which FortiGate feature should be used to achieve this goal?
Application Control
Application control identifies and manages application traffic based on signatures.
Web Filter
Why wrong: Web Filter controls web access based on URLs and content categories.
DNS Filter
Why wrong: DNS Filter blocks domains at the DNS level, not applications.
Intrusion Prevention System (IPS)
Why wrong: IPS detects and prevents network attacks, not application usage.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Application Control
Application Control is the correct feature because it is specifically designed to identify and block peer-to-peer (P2P) file-sharing applications by inspecting traffic patterns and signatures, regardless of the port or protocol used. Unlike port-based blocking, Application Control uses deep packet inspection (DPI) to recognize P2P protocols such as BitTorrent, eDonkey, and Gnutella, even when they attempt to evade detection by using non-standard ports or encryption.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Application Control
Why this is correct
Application control identifies and manages application traffic based on signatures.
Related concept
Read the scenario before looking for a memorised answer.
Web Filter
Why it's wrong here
Web Filter controls web access based on URLs and content categories.
DNS Filter
Why it's wrong here
DNS Filter blocks domains at the DNS level, not applications.
Intrusion Prevention System (IPS)
Why it's wrong here
IPS detects and prevents network attacks, not application usage.
Common exam traps
The trap here is that candidates often confuse Application Control with IPS, assuming that IPS can block any unwanted traffic, but IPS focuses on threats and exploits, not on enforcing acceptable use policies for specific applications like P2P file sharing.
Detailed technical explanation
FortiGate's Application Control engine uses a combination of signature-based detection, behavioral analysis, and protocol decoders to identify over 5,000 applications, including P2P clients. It can differentiate between benign and malicious P2P traffic by examining handshake sequences, packet payloads, and traffic patterns, and it supports granular controls such as blocking only file transfers while allowing chat features within the same application. In a real-world scenario, a user might use a P2P client on a non-standard TCP port (e.g., 8080) to bypass firewall rules, but Application Control will still detect and block it based on the application signature.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Security Profiles — This question tests Security Profiles — Read the scenario before looking for a memorised answer..
The correct answer is: Application Control — Application Control is the correct feature because it is specifically designed to identify and block peer-to-peer (P2P) file-sharing applications by inspecting traffic patterns and signatures, regardless of the port or protocol used. Unlike port-based blocking, Application Control uses deep packet inspection (DPI) to recognize P2P protocols such as BitTorrent, eDonkey, and Gnutella, even when they attempt to evade detection by using non-standard ports or encryption.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This NSE4 practice question is part of Courseiva's free Fortinet 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 NSE4 exam.
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