Why does the ISDB block layers 3 and 4 of the OSI model when applying content filtering? (Choose two.)

Question

Options

• AFortiGate has a predefined list of all IPs and ports for specific applications downloaded from
• BThe ISDB blocks the IP addresses and ports of an application predefined by FortiGuard.
• CThe ISDB works in proxy mode, allowing the analysis of packets in layers 3 and 4 of the OSI
• DThe ISDB limits access by URL and domain.

• A
  92% (47)
• C
  6% (3)
• D
  2% (1)

Explanation

The Internet Service Database (ISDB) in FortiGate is used to enforce content filtering at Layer 3 (Network Layer) and Layer 4 (Transport Layer) of the OSI model by identifying applications based on their predefined IP addresses and ports. FortiGate has a predefined list of all IPs and ports for specific applications downloaded from FortiGate retrieves and updates a predefined list of IPs and ports for different internet services from FortiGuard. This allows FortiGate to block specific services at Layer 3 and Layer 4 without requiring deep packet inspection. The ISDB blocks the IP addresses and ports of an application predefined by FortiGuard: ISDB works by matching traffic to known IP addresses and ports of categorized services. When an application or service is blocked, FortiGate prevents communication by denying traffic based on its destination IP and port number.

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