Explain the use of MODEM,
Router, Switch and Gateway in the context of Computer Networks.
Ans
use of MODEM
Basically, modem is used to connect the analog world to
the digital world. In other words, you can say it is the device that is used to
convert the analog signal to digital signal. For eg. the modem connected with a
computer is usually converts the analog signal that comes through the wire to
the digital bit bcoz computer can only understands the digital signal...
use of Router
A router is used to route data packets between two
networks. It reads the information in each packet to tell where it is going. If
it is destined for an immediate network it has access to, it will strip the
outer packet, readdress the packet to the proper ethernet address, and transmit
it on that network.
use of Switch
A network switch or switching hub is a computer
networking device that links network segments or network devices. The term
commonly refers to a multi-port network bridge that processes and routes data
at the data link layer (layer 2) of the OSI model. Switches that additionally
process data at the network layer (layer 3) and above are often called layer-3
switches or multilayer switches.
use of Gateway
A network gateway is an internetworking system capable of
joining together two networks that use different base protocols. A network
gateway can be implemented completely in software, completely in hardware, or
as a combination of both. Depending on the types of protocols they support,
network gateways can operate at any level of the OSI model.
Because a network gateway, by definition, appears at the
edge of a network, related capabilities like firewalls tend to be integrated
with it. On home networks, a broadband router typically serves as the network
gateway although ordinary computers can also be configured to perform
equivalent functions
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