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Consider the following statements: I. A proxy firewall filters at the application layer. Il: A packet-filter firewall filters at the network or transport layer. Which of the above statements is/are true?

Consider the following statements: I. A proxy firewall filters at the application layer. Il: A packet-filter firewall filters at the network or transport layer. Which of the above statements is/are true? Correct Answer Both I and II

The correct answer is Both I and II.

Key Points

  • Packet filtering firewalls:
    • As the most “basic” and oldest type of firewall architecture, packet-filtering firewalls create a checkpoint at a traffic router or switch.
    • These work at the Network layer of the OSI networking model.
    • The firewall performs a simple check of the data packets coming through the router inspecting information such as the destination and origination IP address, packet type, port number, and other surface-level information without opening up the packet to inspect its contents.
    • Packet filter firewall operates at the network and transport layer. Hence, Statement 2 is correct.
  • A proxy firewall:
    • It is a network security system that protects network resources by filtering messages at the application layer. Hence, Statement 1 is correct.
    • A proxy firewall is also be called an application firewall or gateway firewall.
    • A proxy firewall is also a proxy server, but not all proxy servers are proxy firewalls.

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