internet. history arpa backbone ip addresses –4 numbers separated by dots –hard to remember...
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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:// www.sas.upenn.edu/csc/zimm.html• 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