Why the Internet? Military: ARPANET 1969 First version of todays Internet in 1983
The WWW One of many services on the Internet A series of documents connected through links Started ~1990 Accessed through a web browser
HTML? Hypertext Markup Language Defines the structure of a web page This is a heading A sub-heading This is a paragraph!
How does the WWW work? I figure out the address of where the info I want is I make a request to the server The server sends back my info (A server is any computer that can send out data in response to a request)
IP addresses Every computer on the Internet has a unique address (ex.: 22.214.171.124) Domain Name Servers (DNS) map names to addresses You: 126.96.36.199 Wheres myspace.com? 188.8.131.52 myspace.com: 184.108.40.206 Wheres www.myspace.comwww.myspace.com www.myspace.com: 220.127.116.11 18.104.22.168 DNS server: 22.214.171.124 Give me the Blue Scholars page Ok, here it goes!
A bunch of links and words Crawlers or spiders look at pages Extract all words and links Stores them in a table, much like the index of a book When you make a query, its looked up in the table
Page Ranking A page is important if a lot of important pages link to it Entire Internet gets to vote
Next few days Creating web pages lab - hit and run intro Networking lab - hit and run intro FINAL PROJECT ~2.5 weeks to work on technology of your choice! Individual or in pairs ~5 min presentation on last day.