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Introduction To Networks

A computer network consists of two or more electronic devices like computers or printers linked together to share resources like files, emails, and printers, with connections made via cables for local networks or wireless signals, satellites, and phone lines for long-distance connections. Common network types include local area networks spanning a single building, wireless local area networks, and wide area networks like the Internet. Computer networks require hardware like network interface cards, routers to connect to the Internet, and switches to connect devices within a local area network.

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24 views19 pages

Introduction To Networks

A computer network consists of two or more electronic devices like computers or printers linked together to share resources like files, emails, and printers, with connections made via cables for local networks or wireless signals, satellites, and phone lines for long-distance connections. Common network types include local area networks spanning a single building, wireless local area networks, and wide area networks like the Internet. Computer networks require hardware like network interface cards, routers to connect to the Internet, and switches to connect devices within a local area network.

Uploaded by

syeda mahnoor fatima
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We take content rights seriously. If you suspect this is your content, claim it here.
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NETWORKS NETWORK

Learning Objectives
• Know what is a computer network
• List the uses of computer network
• Understand types of network
• Understand differences between internet and intranet
STAND ALONE COMPUTER

▪ A computer not connected to a network is called stand alone


computer. They must have all the resources (files, programs,
printer etc) exclusively for them to work.
NETWORK – FEATURES

▪ A computer network consists


of 2 or more computers or
electronic devices such as
printers that have been linked
together in order to share
data.
▪ Size of a network can be small
or huge
▪ Can share data
▪ Can share resources like a
printer, a scanner etc.
USES OF NETWORK
▪ Networks allow users to:
▪ Share files
▪ Send emails to each other
▪ Share resources (like printers or scanners).
HOW ARE COMPUTERS LINKED IN A
NETWORK
▪ Computers on networks are usually connect using:
▪ Cables (if the computers are linked together in the same
room/building)
▪ Radio signals (Wi-Fi)
▪ Telephone lines and satellites (for long-range connections).
NETWORK - OVERVIEW
TYPES OF NETWORKS

▪ LAN

▪ Local Area Network


▪ WLAN
▪ Wireless Local Area Network

▪ WAN

▪ Wide Area Network


LOCAL AREA NETWORK
WIDE AREA NETWORK
Ex:INTERNET
INTERNET Vs INTRANET

Internet
• Internet is a global
network of networks
• It’s a public network

Intranet
• Intranet is a network
within an
organization
• It’s a private
network
WIRELESS LOCAL AREA NETWORK
ADVANTAGES & DISADVANTAGES OF A
WLAN COMPARED TO A CABLED LAN
▪ Cabled LAN uses cables to send and receive
data over a network
▪ WLAN provides links that are wireless between
computers and other devices on the network
INTERNET SERVICE PROVIDER

• An ISP (internet service provider) is a


company that provides individuals and
organizations access to the internet and other
related services
• Example - Etisalat
WIRELESS LOCAL AREA NETWORK
(WLAN)

Advantages Disadvantages

• Radio signals may be weak in some areas

• Cheaper as there is less cabling • Radio signals could be intercepted by hackers

• Easy to link devices to the network • Wireless signals are less reliable

• Work anywhere within the range of • Data transfer speed is not so high

the wireless signal • Other electrical and electronic devices may

interrupt the wireless singals


ISP NETWORK DEVICES

▪ NETWORK INTERFACE CARD - It is a hardware


required for a device to get connected to any
network.
▪ ROUTER - It is a network hardware device
which allows a computer or a network of
computers to connect to the internet.
▪ SWITCH - It is a network hardware device which
allows computers to form a LAN.
ISP NETWORK INTERFACE CARD

▪ NETWORK INTERFACE CARD - It is a hardware


required for a device to get connected to any
network.
ISP NETWORK DEVICES

▪ ROUTER - It is a network hardware device


which allows a computer or a network of
computers to connect to the internet.
ISP NETWORK DEVICES

▪ SWITCH - It is a network hardware device which


allows computers to form a LAN.
ISP NETWORK EXAMPLE

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