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packet filter

A packet filter is a router or firewall technology that protects an internal network by either allowing or denying connections based on the source or destinations application/TCP ports, source or destination addresses, or packet protocols.

Related Terms:

Layer 3 Switch
Network Layer
router

Related Animations:
networklayer.swf
packetswitch2.swf
screenedsubnet.swf

Related Illustrations:
packet.gif
packet_networklayer.gif