27-11-2012, 02:14 PM
Internet and Java Foundations, Programming and Practice
java.ppt (Size: 1.36 MB / Downloads: 135)
What is the Internet ?
It is a global network of computers
that communicate with each other
using a variety of protocols and
overcoming various communication
barriers.
It is like International Telephone
System
Internet Technology Evolution
Internet is much bigger than what we think
More than 25 years old
More than doubling every year
Technology effect
suddenly every body sees the need for a technology
like the radio or the TV
10 terabytes flows everyday
Internet
Use of internet advertisement/elections/newspapers
information is public
Ubiquitous technology
Network is the computer
Intranets - internal TCP/IP nets
PC accounts for 55% of total IT
Applications tied to platform - API lock-in
Early Internet
Early Internet supported only email .
File Transfer Protocol development - ftp sites.
Network News was added to the Internet.
Archie - A program to canvass anonymous ftp sites and create a database of what is available
Gopher- A menu-driven interface used to search for information.
Archie and Gopher could answer questions only like ‘what FTP server contains info about “xx” ‘
World Wide Web
World Wide Web conceptualized by Tim Berners-Lee at CERN in Switzerland
Concept of Hypertext led to the development of the Hypertext Markup Language (HTML)
Tim Berners-Lee proposed the ‘Browser’ program
Scientists at CERN designed a TCP/IP based protocol to share Hypertext information called HTTP.
WWW officially is described as a” Wide-area hypermedia information retrieval initiative aiming to give universal access to a large universe of documents.
Internet Tools
Browsers- A tool used to view documents on the WWW
Web servers - Machines which run the HTTP-server Software that respond to HTTP requests which it receives
Authoring Tools - Editors specially made for editing HTML documents
Filters -Tools to convert legacy documents to HTML format
Scripting -Languages used for scripting
WAIS- Wide Area Information Servers (WAIS) for indexing and doing full text searches