Digital Media. Lecture 13: Semester Wrapup. Georgia Gwinnett College School of Science and Technology Dr. Jim Rowan
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1 Digital Media Lecture 13: Semester Wrapup Georgia Gwinnett College School of Science and Technology Dr. Jim Rowan
2 your browser (Safari)(client) your computer DHCP: webpages and other stuff yahoo.com (server) walmart.com (server) The Internet Domain Name System (DNS)
3 your browser (Safari)(client) DHCP: your computer ISP The Internet webpages and other stuff yahoo.com (server) walmart.com (server) Domain Name System (DNS)
4 your browser DHCP: your computer webpages and other stuff yahoo.com (server) The Internet walmart.com (server) Domain Name System (DNS) =
5 your browser DHCP: your computer webpages and other stuff yahoo.com (server) The Internet walmart.com (server) Domain Name System (DNS) =
6 IPv4 & IPv6 How many computers? IPv4 /Internet_Protocol_version_4 FF:FF:FF:FF (in hex) (in decimal) 16**8 = 4,294,967,296 computers IPv6 FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF (in hex) 65536:65536:65536:65536:65536:65536:65536: (in decimal) 16**32 = = 3.4e+38 computers: how big is that?==>
7 How big is that? Circumference of the earth = 25,000 miles 25,000 x 5280 x 12 = 1,584,000,000 inches Circumference = pi x diameter Circumference of the earth = pi x 2 x radius 1,584,000,000 = 3.14 x 2 x radius radius =252,229,299 inches Surface area of the earth = 4 x pi x radius**2 Surface area of the earth = 4 x 3.14 x 252,229,299**2 Surface area of the earth = 7.99e+17 sq inches 3.4e+38 computers / 7.99e+17 sq inches = 4.255e+20 So that s 4.255e+20 computers per square inch of surface area That should cover it!
8 Web Protocols Protocols define the rules to be followed in a conversation who talks first what is acceptable to request what are acceptable responses to a request syntax is the actual form of each interaction HTTP - Hyper Text Transfer Protocol identifies it as a web page request FTP - File Transfer Protocol identifies it as a file that needs to be downloaded SMTP - Simple Mail Transport Protocol identifies it as pertaining to
9 Parts of the Uniform Resource Locator URL Three parts: Specifies the protocol to use HTTP FTP SMTP The Domain Name Directory information used by the server to find the file to transmit This can be directory and pages data to be handed to a program (through scripting)
10 How to start your own website You have to buy a Domain Name from a Domain Name supplier register.com godaddy.com The Domain Name supplier pay by the year set up domain-name-to-ip mapping may provide some storage space for your web pages using their IP
11 or to start a website You could have your own server Macs come with servers built in You must have a FIXED IP from your ISP not really but it makes life MUCH simpler You still need a Domain Name from a Domain Name Supplier pay by the year set up domain-name-to-ip mapping
12 Looking up URLs and IPs whois IP and Domain lookups look up pondliner.com domain name to get IP connect to pondliner.com using the IP address see who owns pondliner.com /whois.rcmx
13 WebCrawlers At an earlier time they looked for and collected addresses to sell to spammers Simple to do request a page look through the text of the page for something.something Can be defeated by using unfriendly-torobot-code like: jrowan (at) GGC (dot) USG (dot) EDU humans can read this just fine!
14 Search Engines Web crawlers look through the web looking for keywords Then they build a catalog of keywords You enter a keyword in the engine It looks at its table It sends you the URLs associated with the keyword GOOGLE extends this by including the number of links that point to that particular page
15 And now for a little history
16 Ward Cunningham invented the WikiWikiWeb www pages quickly editable by its users Wiki is Hawaiian for fast
17 Tim Berners-Lee invented the World Wide Web 1980 built the first web server mid 1980s worked with hypertext I just had to take the hypertext idea and connect it to the TCP and DNS ideas and ta-da! the World Wide Web! " wrote the first web browser (the client)"
18 Randy Pausch HCI pioneer Disney Imagineering CMU: Entertainment Technology Center Creator of the Alice language
19 Randy Pausch The Last Lecture: Really Achieving Your Childhood Dreams /watch?v=ji5_mqicxso
20 And now Alan Kay The best way to predict the future is to invent it
21 Alan Kay s 1968 vision of how computing COULD be: The Dynabook
22 Alan Kay at XEROX PARC: His 1976 vision of how computing COULD be: The GUI and Desktop Metaphor (notice the mouse!)
23 which opens the door for Steven Jobs Macintosh 1984 and personal computing as we know it is born
24
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