discovery of internet

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SOUMITRA ACHARYA ITT - TRAINING REGISTRATION NO. - IPCC/CRO0264560

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WEB TECHNOLOGY AND SYSTEM SECURITY AND MAINTENANCE PRESENTED BY SOUMITRA ACHARYA

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INTERNET BASICS

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DEFINITION OF INTERNET The internet, sometimes called simply ‘’the Net,’’ is a worldwide system of computer networks - a network of networks in which users at any one computer can, if they have permission , get information from any other computer.

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The history of internet is closely tied to the U.S. Department of Defense. In the 1970’s, the Advanced Research Projects Agency(ARPA) developed a network that has evolved into today’s Internet. The network was named ARPANET and had many objectives that are still relevant today.

ARPANET OBJECTIVES : 

ARPANET OBJECTIVES The network would continue to function even if one or many of the computers or connections in the network failed. The network had to be useable by vastly different hardware and software platforms. The network had to be able to automatically reroute traffic around non-functioning parts of the network. There are approx. 1,46,36,32,361 users of internet presently and the number is increasing at an extraordinary rate.

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INTERNET SERVICE PROVIDER

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GENERAL USE OF INTERNET ACCESS SHARING TO VAST RESOURCE OF INFORMATION GLOBAL FILE SHARING VOICE OVER INTERNET PROTOCOL

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SECTOR WISE USE OF INTERNET

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ADVANTAGES OF INTERNET The foremost target of internet has always been the communication. Information is probably the biggest advantage internet is offering and it is a virtual treasure of information. Many services r now provided on the internet such as Online banking, job seeking, hotel reservation etc.

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DISADVANTAGES OF INTERNET Theft of personal information. Spamming refers to sending unwanted e-mails in bulk, which provide no purpose and needlessly obstruct the entire system. Computers attached to internet r more prone to virus attacks and they can end up into crashing ur whole hard disk, causing ur considerable headache. There are thousands of pornographic sites on the internet that can be easily found and can be detrimental factor to letting children use the internet.

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VARIOUS INTERNET SERVICE

TYPES OF E-MAIL SERVERS : 

TYPES OF E-MAIL SERVERS SMTP – The SMTP server is the mail sending server. It receives mail from the local user and forwards it to the mail server for the user you are sending mail to. POP – Through the POP server you can indentify yourself to the server with a username and a password and it sends you the messages. IMAP – This is another server that to receive the mail as similar to POP server. But the difference is that all the messages stay on the server unless specifically deleted by you.

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ADVANTAGES OF USING E-MAIL E-MAIL IS FAST E-MAIL IS INEXPENSIVE E-MAIL IS EASY TO FILTER

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FREE E-MAIL SERVICES G MAIL AIM MAIL

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FREE E-MAIL SERVICES YAHOO! MAIL MSN HOTMAIL

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DOWNLOADING PROCESS

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REFERENCE SITES BUSINESS AND FINANCE HOOVERS.COM ANNUALREPORTS.COM BANKRATE.COM BUSINESSWIRE.COM

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HEALTH AND SCIENCES WEBHEALTHCENTRE.COM ONLINEHEALTH.COM SCIENCEMAG.ORG

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BOOKS AND LITERATURE AMAZON.COM ALIBRIS.COM IPL.ORG/DIV/LITCRIT

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INTERNET CONNECTIONS AND ADDRESSING

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TYPES OF INTERNET CONNECTIONS ANALOG/DIAL - UP CONNECTIONS

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ISDN(Integrated Services Digital Network) DSL(Digital subscriber line)

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SDSL(Symmetric digital subscriber line) VDSL(Very High Digital Subscriber Line)

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The World wide web is a system of internet servers that supports hypertext to access several internet protocols on a single interface. The WWW was developed in 1989 by Tim Berners- lee of the European Particle Physics Lab(CERN).

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Hypertext is a document containing words that connect to other documents. Producing hypertext for the web is accomplished by creating documents with a language, or HTML.

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TYPES OF WEBSITES WEBSITE CLASSIFICATION ACCORDING TO STYLE STATIC WEBSITE – A static website is one that has web pages stored on the server in the same form as the user will view them. DYANMIC WEBSITE – It does not have any web pages stored on the server. Instead, the web page content changes automatically.

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WEBSITE CLASSIFICATION ACCORDING TO content

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NETSCAPE NAVIGATOR – Netscape is one of the well known web browsers. Netscape implements several creative features that NCSA Mosaic and others do not. Because of its features and speed Netscape holds about 75% of the web client market. ...