8/8/2019 Nw Devices
2/2
y Proxy: computernetwork service which allows clients to make
indirect networkconnections to other network services
y Firewall: a piece of hardware or software put on the network
to prevent somecommunications forbidden by the network policy
y Network Address Translator: network service provide as
hardware or software thatconverts internal to external network
addresses and vice versa
Other hardware for establishing networks or dial-up
connections:
y Multiplexer: device that combines several electrical signals
into a single signaly Network Card: a piece of computer hardware to
allow the attached computer to
communicate by network
y Modem: device that modulates an analog "carrier" signal (such
as sound), to encodedigital information, and that also demodulates
such a carrier signal to decode the
transmitted information, as a computer communicating with
another computer over thetelephone network
yISDN
terminal adapter(TA): a specialized gateway for ISDN
y Line Driver: a device to increase transmission distance by
amplifying the signal. Base-
band networks only.y NetworkDevice Connectivity
