INTRODUCTION TO THE INTERNET

                                             
                                          INTERNET 

               Internet is a worldwide collection of works that links millions of businesses, government agencies, educational institutions, and individuals.

                        EVOLUTION OF THE INTERNET

The internet originated as APRANET and have two main goals:

→Allow scientist at different physical locations to share information and work together.

→Function  even if part of the network were disabled or destroyed by a disaster.

INTERNET2

→Internet2 is not a new internet but it is a Researcg and Development project.

→to ensure the internet in the future can handle tomorrow's application.

                               ADVANTAGES AND DISADVANTAGES OF INTERNET

ADVANTAGES	DISADVANTAGES
Software download: -You can freely download software like utilities, games, music, videos, movies, etc from the internet.	Virus threat :         - Computers attached to internet are more prone to virus attacks.
Online services:      -you can book ticket,hotel,flight online.	Social disconnect : - antisocial
E-mail:    - people can sent messages. It is delivered instantly to people anywhere in the world, unlike traditional mail that takes a lot of time.	Dangers involved when children using the internet: -Exposed children talking to harmful person and promote them to watch pornography.
Information resources: -Can find any information on almost any kind of subject that you are looking for by using Google,Yahoo,etc	Theft of personal information:                                - your personal information can be        accessed by an irresponsible people.

INTRANET 

⇨An intranet is an internal network that uses internet technologies.

⇨Network which only available inside an organization or a company.

⇨Intranet generally make company information accessible to employees and facilitate             working in groups.    

ADVANTAGES	DISADVANTAGES
commercial or confidental data is kept secure in the organization.	High financial cost
Email remain private and may also be encrypted	Connections between an intranet and the internet potentially compromises security by allowing virus infections or system hacking.
High bandwith. No connection limits unlike the internet.	Staff need training
Reliable. The company will have dedicated IT personnal to keep things running smoothly.	Information overload

EXTRANET

⇢An extranet is the portion of a company’s network that allows customers or suppliers of a company to access parts of an enterprise’s intranet.

⇢An extranet provides a secure, physical connection to the company’s network.

ADVANTAGES	DISADVANTAGES
Exchange large volumes of data using eletronic data interchange (EDI)	Expensive to implement
Share product catalogs exlusively with trade partners.	Security can be concern
Collaborate with other companies on joint development efforts.
Jointly develop and use training programs with other companies.