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WTA1_Internet_Technology

WTA1_Internet_Technology - WTA Topic 1 Internet Technology...

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WTA Topic 1 : Internet Technology Text Reference Programming the World Wide Web, 4 th Edition, Robert W. Sebesta 1 Subject Incharge Pratidnya S. Hegde Patil
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Origins of Internet US Department of Defense (DoD) wanted a new large-scale computer network in 1960s. Purpose : Communications, file sharing, email and remote computer access for researchers working on defense related contracts. Network should be robust. 2 ARPAnet not available for educational institutions. BITNET and CSNET developed for email facilities. NSFnet was created in 1986 connected
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Internet Huge collection of DIVERSE DEVICES connected in a communications network. Single low-level protocol TCP/IP. It allows all devices connected to the Internet to appear exactly the same. Instead of connected every device to Internet, create a local network in the organisation and 3 connect one of the node’s to Internet. Thus Internet is network of networks rather than a network of computers.
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Internet Protocol Addresses box4 Internet nodes square6 for People identified by names and square6 for Computers identified by numeric addresses. box4 IP addresses(32-bits) are four 8-bit digits separated by dot operator. 4 box4 IPv6 expanded to 128 bits.
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Domain Names Difficult for people to remember numbers of machines on the Internet so textual names used instead. Begins with host machine followed by progressively larger enclosing collection of machines called domains. Called as . 5 : collection of machines on the Internet for converting fully qualified domain name to an IP address.
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Domain Name Service (DNS) 6
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Protocols that run on top of TCP/IP To support a variety of Internet uses. : to allow a user on one computer to log on to and use another computer. : to transfer files among computers on 7 the Internet. : to serve as an electronic bulletin board. : to allow users on other computers on the Internet.
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Restricted the growth of Internet as : xrhombus Each had their own user interface xrhombus Useful for only the intended purpose it was designed. xrhombus Users were required to all learn all different interfaces to gain all advantages of Internet. 8
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WWW or Web New protocol for the Internet and also a system of document access. Designed to allow a user anywhere on the Internet to search for and retrieve documents from databases on any number of different document-serving computers. : links for nonsequential browsing. : nontextual information. 9 Vast document access through Web Browsers provided by Web Servers.
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: collection of computers and other devices connected by equipment that allows to communicate with each other. 10 : collection of software and protocols that has been installed on most, if not all, of the computers on the Internet.
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Web Browsers box4 Web and many other systems operate in client/server configuration.
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