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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 wireless medium. It converts
data from digital to analog and vice versa. The process of converting analog signals to digital
signals is called demodulation. The process of converting digital signals to analog signals is
called modulation.
Networking Cable: It is also known as Ethernet cable. It is a transmission medium that allows
to transport information from one place to another. There are various types of networking
cables such as coaxial cable, twisted pair cable, and optical fiber cable.
TYPES OF NETWORK
Networks can be classified into different types on the basis of geographical areas covered. There
are five types of networks as follows: Workstation
LAN (Local Area Network)
Server
It is a digital communication system that interconnects a larger
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 nationwide
basis. In such type of network, there may not LAN
be physical connection between computers.
In WAN telephone lines, microwave, satellite
links, etc. can be used as transmission medium. Wide Area Network
Computer Networking 9

