uli101 Week11

uli101 Week11 - ULI101 Week11 WeekOverview...

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    ULI101 Week 11
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    Week Overview Introduction to the Internet and the WWW Internet/WWW Terminology Introduction to XHTML Basic XHTML tags Images and Hyperlinks The W3C Validator
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    Internet - History Computers were not always set-up to form networks: 1957 1958  – U.S. government developed 2 agencies to develop new  technologies: NASA  (National Aeronautics and Space Administration) ARPA  (Advanced Research Projects Agency) This agency’s purpose was to allow U.S. technology to  “keep-up” with the USSR. There was a need to create a  complex communications network in the event of war.
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    Internet - History ARPAnet  (Late 60s ) Network of computers to keep computer networks  operational in case of Nuclear war. Also allow  communication among defense research scientists. Common Network Terminology LAN  (Local Area Network) A computer network over a small area (e.g. a building). WAN  (wide Area Network) A computer network over large areas (e.g. across the  country).
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    Internet - History ARPAnet  is considered to be the “ancestor of the Internet”. It lead to  a development of many other key technologies such as: Packet Switching (1969) Telnet (1970). FTP (1972) E-mail standard (using “@” symbol after user name - 1973) TCP/IP (1977) Packet-Switching  was a protocol (a “set of communication rules”) to  transfer data between computer systems (it was later replaced by the more efficient TCP/IP protocol)
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    Internet - Terms TCP/IP   (Transmission Control Protocol / Internet Protocol) Considered to be the basic communication language of the Internet. TCP/IP is a two-layer Program: Higher Layer: TCP Manages the assembling or file into packets that are  transmitted over the Internet and received by a TCP  layer that resembles the packets into the original  message. Lower Layer: IP Handles the address portion of each package so that it gets to the right destination. Each gateway computer on the network check this address to see where to forward message  
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    Internet - Terms IP Addressing Each computer attached to a TCP/IP network must have its own  unique address in order to be able to communicate with other  computers. IP addresses identify the host computers so that packets of  information reach the correct computer.   IP addresses are stored internally in computers and so the  address is in four binary units called bytes.  These are usually  written as four decimal numbers separated by periods with each  number being from 0 to 255.  For example, 142.204.1.2.  
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uli101 Week11 - ULI101 Week11 WeekOverview...

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