A proxy firewall filter works at –
2022
A proxy firewall filter works at –
- A.
Physical layer
- B.
Data link layer
- C.
Network layer
- D.
Application layer
Attempted by 78 students.
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Correct answer: D
Unlike traditional packet filters that only look at IP addresses or ports, a proxy firewall operates at the Application Layer (Layer 7).
How it works: It acts as an intermediary (proxy) between an internal user and the external server. It establishes a connection with the source and a separate connection with the destination.
Deep Packet Inspection (DPI): Because it operates at the application level, it can understand specific protocols (like HTTP, FTP, or SMTP). It doesn't just see "a packet"; it sees "a request to download a file" or "an email containing a virus," allowing it to filter content based on specific application rules.