Quick Answer
The correct answers are FortiGuard category-based filtering and web rating override. FortiGuard category-based filtering works by querying FortiGuard’s cloud-based web rating database, which categorizes URLs into threat types like malware or phishing, allowing the FortiGate to automatically block access to known malicious websites. Web rating override complements this by letting administrators manually assign a custom rating to a specific URL, effectively blocking a site that FortiGuard has not yet flagged as malicious—closing the gap between automated detection and emerging threats. On the Fortinet NSE 4 Network Security Professional exam, this question tests your understanding of how web filtering features block malicious websites through both automated reputation and manual administrative control. A common trap is assuming only one feature handles malicious sites, but the exam emphasizes that overrides are essential for zero-day or uncategorized threats. Memory tip: think “Auto + Manual” — FortiGuard handles the known, overrides handle the unknown.
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.
Which TWO web filtering features can be used to block access to malicious websites? (Choose two.)
Static URL filtering
Why wrong: Static filtering blocks specific URLs, but not necessarily malicious.
Application control
Why wrong: Application control manages apps, not URLs.
FortiGuard category-based filtering
Blocks categories like 'Malicious'.
Web rating override
Allows overriding categories to block malicious sites.
DNS filter
Why wrong: DNS filter blocks based on DNS, not web content.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
FortiGuard category-based filtering
FortiGuard category-based filtering (C) is correct because it leverages FortiGuard's cloud-based web rating database to categorize URLs and block access to known malicious sites, such as those hosting malware or phishing. Web rating override (D) is correct because it allows administrators to manually override the FortiGuard rating for specific URLs, enabling them to block a site that may not yet be categorized as malicious by FortiGuard. Both features directly control access to malicious websites based on URL reputation.
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.
Static URL filtering
Why it's wrong here
Static filtering blocks specific URLs, but not necessarily malicious.
Application control
Why it's wrong here
Application control manages apps, not URLs.
FortiGuard category-based filtering
Why this is correct
Blocks categories like 'Malicious'.
Related concept
Read the scenario before looking for a memorised answer.
Web rating override
Why this is correct
Allows overriding categories to block malicious sites.
Related concept
Read the scenario before looking for a memorised answer.
DNS filter
Why it's wrong here
DNS filter blocks based on DNS, not web content.
Common exam traps
The trap here is that candidates often confuse DNS filter with web filtering, but DNS filter is a separate security feature (under DNS Filter profile) and is not considered a web filtering feature in the NSE4 exam; the question explicitly asks for 'web filtering features' as defined in the FortiGate Web Filter profile.
Detailed technical explanation
FortiGuard category-based filtering uses a cloud-based database with over 100 categories (e.g., Malware, Phishing, Spam) and assigns a rating to each URL; when a user requests a URL, the FortiGate queries the FortiGuard server (or uses a local cache) to check the category and applies the configured action (block, allow, warn). Web rating override allows administrators to create local overrides that change the rating of a specific URL or domain, which is stored in the FortiGate's local rating database and takes precedence over the cloud rating; this is useful for blocking newly discovered malicious sites before FortiGuard updates its database. Both features operate at the HTTP/HTTPS proxy level, inspecting the full URL path, unlike DNS filter which only inspects the domain name.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the NSE4 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Profiles — study guide chapter
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Security Profiles practice questions
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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: FortiGuard category-based filtering — FortiGuard category-based filtering (C) is correct because it leverages FortiGuard's cloud-based web rating database to categorize URLs and block access to known malicious sites, such as those hosting malware or phishing. Web rating override (D) is correct because it allows administrators to manually override the FortiGuard rating for specific URLs, enabling them to block a site that may not yet be categorized as malicious by FortiGuard. Both features directly control access to malicious websites based on URL reputation.
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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Same concept, more angles
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. Which FortiGate feature allows you to block access to specific URL categories such as 'Social Media' or 'Gambling'?
easyWhy A: FortiGate's Web Filtering feature uses URL rating and category databases (e.g., FortiGuard) to block access to entire categories like 'Social Media' or 'Gambling' based on the destination URL. This is distinct from content inspection; it operates at the HTTP/HTTPS request level by matching the requested URL against predefined or custom category lists.
Variation 2. A network administrator wants to prevent users from accessing known malicious websites using FortiGate. Which security profile should be applied to the firewall policy to achieve this goal?
easyWhy D: Web filtering profiles allow administrators to control access to websites based on FortiGuard categories, URL filtering, and DNS filtering.
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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