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Router: It is a networking device used to connect and facilitate transfer of information
between two networks. It is located at the gateways where two networks connect.
Modem: It stands for MODULATOR – DEMODULATOR. It is a hardware device that is used
to connect a computer to the Internet via a telephone line or a wireless medium. It converts
data from digital to analog and vice versa. The process of converting analog signals to digital
signals is called modulation. The process of converting digital signals to analog signals is
called demodulation.
Networking Cable: It is also known as Ethernet cable. It is a transmission medium that allows
to transport information from one place to other place. There are various types of networking
cables such as coaxial cable, twisted pair cable, and optical fiber cable.
TYPES OF NETWORK
Different types of networks can classified on the basis of geographical areas covered. There are
five types of networks as follows: Workstation
LAN (Local Area Network)
It is a digital communication system that interconnects a larger Server
number of computers and other peripheral devices within a radius
of less than 1 km. This type of network is usually preferred for a
smaller area such as a school building, computer lab, etc. The total
diameter of LAN is not more than 5 km.
MAN
Local Area Network
MAN (Metropolitan Area Network)
LAN LAN
This network consists of two or more local area
networks or campus area networks together that
usually spans several buildings in the same city or
town.
LAN
LAN LAN
Metropolitan Area Network LAN LAN
WAN (Wide Area Network)
It is a digital communication system that interconnects
a large number of computers in a wide geographical
area. This network may operate on a worldwide or
LAN
nationwide basis. In such type of network, there may
not be physical connection between computers. In
WAN telephone lines, microwave, satellite links, etc.
can be used as transmission medium. Wide Area Network
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