GCIA: GIAC Certified Intrusion AnalystDemo

By GIAC · Question Mode

QuestionQ240

Concepts of TCP/IP and the Link Layer

Which of the following firewalls operates across three layers: Layer 3, Layer 4, and Layer 5?

  • A Circuit-level firewall
  • B Application layer firewall
  • C Dynamic packet-filtering firewall
  • D Proxy firewall
Explanation

A dynamic packet-filtering firewall maintains state for active connections while filtering IP addresses and transport ports. Its stateful inspection therefore spans the network, transport, and session layers (OSI Layers 3, 4, and 5).

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