Internet. History ARPA Backbone IP Addresses –4 numbers separated by dots –Hard to remember –Exclusive club of users.

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Presentation transcript:

Internet

History ARPA Backbone IP Addresses –4 numbers separated by dots –Hard to remember –Exclusive club of users

Protocol - http Protocol –A set of rules allowing transfer of information Hyper Text Transfer Protocol –Allows transfer of visual, audio and text over the Internet FTP –A set of rules allowing transfer of files TCP/IP –A set of rules allowing transfer of messages

World Wide Web Software that follows the HTTP protocol No one owns the web No one controls the web Web site address is called URL –Uniform Resource Locator

URL - Example http - the protocol www – the web server for sas sas - the sub-domain upenn – the domain edu – the top domain csc – the folder on the web server of sas zimm.html – the file in the folder

Top domains US and non-US US –com is commercial –edu – educational –gov – government –mil – military –org – non profit Outside US the top is the country code –uk – United Kingdom –ca - Canada

Terms Surfing Upload and Download ISP Cookie Blog IM Search Engine Spider