Network filter

Network filter may refer to:


 * Firewall (computing), especially a packet filter, to control inbound and outbound network traffic at the device or local-area-network level
 * A computer and network surveillance device or software, of a variety of types
 * An Internet filter, software (or firmware) that performs content control and blockage
 * A filter (signal processing) of any of several types, as used on a network line or to adjust a wireless network signal, to improve signal quality by removing "noise" (interference)
 * A line conditioner of any of several types, as used on a network line, especially:
 * Attenuator (electronics), an electronic device that reduces the amplitude of an electronic signal, as used on an Ethernet or other electrical network line
 * Optical attenuator, an electronic device that reduces the amplitude of an optical signal, as used on a fiberoptic network line