2.4 Introduction to the Internet

Topic 2

2.0 INTERNET TECHNOLOGY

2.4 Introduction to the Internet

At the end of this topic, students should be able to:
• Explain the Internet
• Describe advantages and disadvantages of the
Internet

• Explain the use of Internet technologies in Intranet

and Extranet

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Recap : What is Network?

• A NETWORK is a collection of computers and devices
connected together via communications devices and
transmission media to share resources, such as hardware,

software, data and information.

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Definition of Internet

The Internet is a worldwide collection of networks
that connects millions of businesses, government
agencies, educational institutions, and
individuals.

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Evolution of the Internet

(Additional Information)

 The Internet originated as ARPANET in
September 1969 and had two main goals:

Allow scientists at Function even if part of
different physical the network were
locations to share
information and work disabled or destroyed
by a disaster
together

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Evolution of the Internet
(Additional Information)

1969 1984 1986 NSF 1995 NSFNet 1996 Today More
ARPANET ARPANET connects terminates Internet2 is than 550
becomes has more NSFnet to its network
functional than 1,000 ARPANET founded million hosts
individual and becomes on the connect to
computers known as Internet and the Internet
linked as the Internet
resumes
hosts status as
research
network

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Advantages of the Internet

Easier Communication :

Using internet, people can communicate more
efficiently and easily via email, instant
messaging, chat rooms, blogs, wikis, online
social networks, video calls, VOIP, and more.

Globalization of knowledge:

Using internet, people can get information on
any subjects ranging from government,
education, health care, finance, etc by using
search engines like Google, Yahoo.

Advantages of the Internet

Entertainment :

Using internet, people can download games,
movies, music or just surf the celebrity
websites.

Online Services :

Using internet, people can perform numerous
online services such as online banking, online
shopping, online flight booking, online bill
payments, e-filing etc., right from home and has
made life very convenient.

Disadvantages of the
Internet

Internet security issues :

For customers to perform online transactions using the
internet, they have to provide their personal details
such as name, address, credit card number, etc.
Experienced hackers can access this information and
then use your personal details for their benefit.

Social implications :

With the increased addiction to social
networks and internet games, people are
spending more time on computers and give
up on their normal life

Disadvantages of the
Internet

Health Issue

Prolonged or improper computer use can lead to
injuries or disorders of the hands, wrists, elbows,
eyes, neck and back.

Virus Threat:

Internet users are often affected by
virus attacks on their systems.
Computers connected to the
Internet are very prone to targeted
virus attacks and may end up
crashing.

Intranet
(intra means within)

Definition An Intranet is a private network that
uses Internet technologies that can
only be accessed by the employees
within (inside) the organization.

Accessibility Can only be accessed by the
employees within (inside) the
organization.

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Intranet

Intranets generally make company information accessible
to employees and facilitate collaboration within an
organization.

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Definition Extranet
(extra means outside)

Private network that uses internet
technology that can only be accessed
by employees within (inside) the
organization and suppliers, vendors,
partners, and customers outside the
organization.

Accessibility Can only be accessed by employees
within (inside) the organization and
suppliers, vendors, partners, and
customers outside the organization.

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Package shipping Extranet
companies, for
example, allow 13
customers to access
their intranet via an
extranet to print air
bills, schedule
pickups, etc.

Differences between Internet,
Intranet, Extranet

Internet Intranet Extranet

Definition The Internet (Public Private network that Private network that
network) is a uses Internet uses internet technology
worldwide collection of technologies that that can only be
networks that connects can only be accessed by employees
millions of businesses, accessed by within(inside) the
government agencies, employees within organization and
educational (inside )the suppliers, vendors,
institutions, and organization. partners, and customers
individuals. outside the organization.

Accessibility Can be accessed by Can only be Can only be accessed by
accessed by employees
anyone around the employees within within(inside) the
(inside )the organization and
world organization. suppliers, vendors,
partners, and customers
outside the organization.

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Differences between Internet,
Intranet, Extranet

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Checklist – Introduction to

the Internet

1. Define Internet.
2. Explain the advantages of Internet.
3. Explain the disadvantages of Internet.
4. Define Intranet.
5. Define Extranet.
6. Differentiate between Internet, Intranet and Extranet

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