INTERNET & IT’S WORKING

MANU NAIRROLL NO: 23

MBA(FT), SEM: 1SMS, CUSAT

CONTENTS

• Introduction• What is Internet• Origin of Internet• Evolution of Internet• Internet and its working• Advantages• Disadvantages • Future• Conclusion

WHAT IS A NETWORK?

A large number of separate but interconnected computers forms a network.

Three Types: LAN (Local Area Network)MAN(Metropolitan Area Network)WAN(Wide Area Network)

WHAT IS INTERNET?

A collection of interconnected networks forms INTERNET.

The internet as we know today is actually a very large wide area network (WAN) connecting computers and networks around the world.

Internet makes it possible for millions of computer users to connect to one another via telephone line, cables and satellites.

ORIGIN OF INTERNET

Internet was born in late 1960s.

Advanced Research Project Agency (ARPA) or US Department of Defence linked together mainframe computers

to form a communication network known as ARPANET

AGENCY’S MAIN OBJECTIVES

The design was built around reliability and redundancy so as to allow communication to continue between major nodes in case of attacks (nuclear attacks) or natural disaster.

To make local resource available to any computer (however remote) in net in such a way that any program available to local users can be used remotely without degradation.

EVOLUTION OF INTERNET

1950:Development of Computers.

1960 & Early 1970:Packet switching networks (like ARPANET) were developed using variety of protocols. ARPANET led to the development of protocols of internetworking. Note: Internetworking is the process of linking collection of network)

EVOLUTION contd…

1981:Access to ARPANET was expanded

when National Science Foundation (NSF) created a new high speed network.

Objectives:To interconnect supercomputing centres

so they could access one another’s resources.

To give academic and research centres access to one another for purpose of exchanging information.

EVOLUTION contd…

1982:The Internet Protocol Suite (TCP/IP) was standardised and concept of world wide network of fully interconnected TCP/IP network called internet was introduced.

1990:ARPANET was decommissioned since speed was no longer sufficient . NSFNET fully replaced ARPANET.

EVOLUTION contd…

1995:NSFNET was decommissioned and Internet got commercialised.

INTERNET

SERVER

SERVER

STORED

Securitycatalyst.com67.205.46.248

Google.com72.14.205.100

Facebook.com69.63.176.140

Yahoo.com216.27.69.178

IP ADDRESS

INTERNET SERVICE

PROVIDER

Gmail.com

aol.com(Server and ISP)

Client

DSL

INTERNET SERVICE

PROVIDER

Gmail.com

aol.com(Server and ISP)

Client

DSL

MAIL

ASWIN

ASWIN

I S P

Facebook.com69.63.178.11

Marketresearch.com209.190.222.100

PAUL192.16.22.11

BOSS192.16.22.15

I S P

Facebook.com69.63.178.11

Marketresearch.com209.190.222.100

PAUL192.16.22.11

BOSS192.16.22.15

ADVANTAGES

Communication

Information

Entertainment

Services

E-Commerce

 

DISADVANTAGES

Hacking

Spamming

Spoofing

Phishing

Virus threat

FUTURE OF INTERNET !!!

Globalism

Virtual reality

Bandwidth

Wireless

Grids

Integration

CONCLUSION

Internet has become a very important part of our life. It is impossible to think a world without computers because our day to day activities are dependent on it. So it is necessary to know how internet works.

REFERENCES

Andrew S. Tanenbaum, Computer Networks, 4th Edition, Pearson Education.

Video by Aaron Titus, Securitycatalyst.com.

Wikipedia