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In which OSI layers a packet filtering firewall operates?

  • A.At the network 
  • B.At the gateway layer
  • C.At the transport layer
  • D.All of the above

Answer: C

Correct answer: At the network

A packet-filtering firewall makes its decisions from the headers - source and destination address, protocol and port - which places it at the network layer, where those addresses live. Application-layer inspection belongs to a proxy firewall, which is a different design.

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