Q1. Which of the following Firewall technology works at the Network Layer of ISO/OSI model?
A. Application Layer Gateways
B. Authentication Servers
C. Encryption Servers
D. Packet Filters
Correct Answer: D
1. The Packet Filters work at Network Layer of ISO/OSI stack.
2. The Application Layer Gateways work at the Application Layer of ISO/OSI stack.
3. A Firewall implemented with stateful technology (like Checkpoint Firewall-1) works at all layers of IS/OSI model.
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