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COS 125

COS 125. DAY 5. Agenda. Questions from last Class?? Assignment #1 Graded 16 A’s, I non-submit Too Easy! Assignment #2 will be posted by next class Quiz #1 on Feb 3, 20 M/C, 4 Short essays, One extra Credit Chap 1-28 Today’s Topic Finish on Communicating on the Internet

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COS 125

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  1. COS 125 DAY 5

  2. Agenda • Questions from last Class?? • Assignment #1 Graded • 16 A’s, I non-submit • Too Easy! • Assignment #2 will be posted by next class • Quiz #1 on Feb 3, • 20 M/C, 4 Short essays, One extra Credit • Chap 1-28 • Today’s Topic • Finish on Communicating on the Internet • Start on Using the World Wide Web

  3. How Internet Chat works • Live keyboard conversation on the Internet • Most popular is Internet Relay Chat • Topic are channels (Chat Rooms) • Chat works on Client/Server model • Users are on clients • The chat room is on a server • There are many proprietary Chat solutions • WebCT

  4. How IRC works Images from http://www.nur.ac.rw/chat.htm

  5. Chat stuff • Acronyms • brb = be right back bbl = be back later btw = by the way np = no problem lol = laughing out loud re = hi again, as in 're hi' rotfl = rolling on the floor laughing bbiaf = be back in a flash ttfn = ta ta for now imho = in my humble opinion j/k = just kidding wb = welcome back

  6. :) Smile :-) Basic Smile ;-) eye wink :-( sad :-I Indifference :-> Sarcastic >:-> Diabolic (-: left handed %-) Drunk 8-) Uses glasses B:-) Sunglasses on head B-) dark sunglasses 8:-) little girl :-{) Mustache :-{}painted mouth {:-)with hair :-^) with flu :-)^ choking :'-( crying :-@ shouting :-& cant talk -:-) punk |:-) fall sleep :-O waking up 0:-) angel :-D laughing :-X lips seal :-Q smoker :-/ skeptic C=:-) chef @= nuclear bomb *:O) clown [:-) using walkman (:I egghead @:-) with turban X-( just died :] friendly smile :D laugh :( again sad :O shouting [] hugs :* kisses :*, ;* more kisses :*, :*, :*, :*, more and more kisses Emoticons

  7. Instant Messaging • Differs from chat in that it is one-to-one • Chat one-to-many • Four popular software applications that have little to no interoperability • MSN Messenger® • AOL Instant Messenger® • ICQ® • YAHOO! Messenger®

  8. How Instant Messaging works • Login to messaging server (AOL, MSN) • Send your buddy list to server • Server tells you which of your buddies are logged in • Select on inline buddy to talk to • Some systems connect buddy to buddy to chat (MSN) • Other run all chats through the server (AIM)

  9. How Internet Phone Calls Work • This is using the Internet to replace the Public Switched Telephone system • Save money on long distance • Called Voice over IP or VoIP • Converts Voice (analog) to digital packets and vise versa • Digital packets sent over the internet

  10. PC Phones PC to PC PC to Regular Phone Regular Phone to Regular Phone Images from http://www.pc-telephone.com/

  11. PBX-PBX IP Telephony Ordinary Telephone Ordinary Telephone IP Packet Frame Relay, ATM, or the Internet PBX with IP Telephony Module PBX with IP Telephony Module

  12. IP Phones from Cisco

  13. How Web Pages Work • Pages “live” on the World Wide Web • Connected to each other using Hypertext • Pages are written in HTML • Works on Client/server model

  14. Web Site Structure • First page is called the Home Page • Other pages are organized in one of three possible types • Tree • Linear • random

  15. Tree structure

  16. Linear Structure

  17. Random Structure

  18. How Web Browsers Work • Web Browsers interpret and display web pages • HTML • DHTML • XML • Scripts • Applications and programs • Helper apps • Plug-ins

  19. Web Browsers • Two most popular and competitive browsers • Internet Explorer • Netscape Navigator • Both have very similar features

  20. Web Codes • Successful Transactions • 200 The request was fulfilled. • 201 The POST request was completed successfully. • 202 Request accepted for processing of unknown type. Rare. • 203 Request partially fulfilled. • Redirection Transactions • 301 The requested resource has been permanently moved to a new URL. Usually accompanied by Location: newURL which automatically connects to the new URL. • 302 Requested resource found, but at a different URL. You'll get a 302 Redirection if you omit the trailing slash when pointing at a directory (sometimes called a malformed request). • 304 Unmodified data not returned in response to a GET request with the If-Modified-Since field. Occurs when a browser requests data found in cache. • Error Messages • 400 Error in request syntax. • 401 Request requires an Authorization: field, and the client did not provide one. This response is accompanied by a list of acceptable authorization schemes use WWW-Authenticate response headers. Error 401 can be part of a client/server dialogue to negotiate encryption and user authentication schemes. • 402 The requested operation costs money, and the client did not specify a valid Chargeto field. • 403 Request for forbidden resource denied. • 404 Requested resource not found. • 500 The server has encountered an internal error and cannot continue processing your request. • 501 Request okay but denied because server doesn't support transaction method.

  21. How Markup Languages Work • Markup languages contain two things • Content • Instructions on how to format content (tags) • Markup languages are NOT programming languages • 3 types of markup languages exist on the WWW • HTML and xHTML • DHTML • XML

  22. HTML • Uses <tags>content</tags> • Latest version n HTML 4.01 • Full specification available at http://www.w3.org/TR/html4/ • HTML can be written with any text editor but specialized HTML editor have been developed • We will be using Macromedia Dreamweaver 2004 in this class

  23. Example HTMLs • Block Level Tags • Text Formatting • Using Images • Tables • Frames

  24. DHTML • DHTML is Dynamic HTML • Allows changes to the HTML “on the fly” • Great for animation and special effects • Uses 3 Technologies • Document Object Model (DOM) • tracks every object and element on a web pages • Cascading Style Sheets (CSS) • Formatting and style information for a web pages • Client-Side Scripting • Provide access to DOM and CSS to change them

  25. Example DHTML • Lots of examples available on the web • W3Schools.com • http://www.w3schools.com/dhtml/dhtml_examples.asp • Olagam • http://www.olagam.com/tech3/dhtml-code.htm • Game written by COS 381 students • http://perleybrook.umfk.maine.edu/classes/cos381/jumble1.htm

  26. How XML works • Allows the creation of new markup languages • Make your own tags that have special meaning for a group of people • There is no presentation information in an XML document • Example XML http://perleybrook.umfk.maine.edu/examples/planes.xml

  27. How XML works • XML languages are defined in • Data Type Definitions • http://perleybrook.umfk.maine.edu/examples/planes.dtd • Schemas • http://perleybrook.umfk.maine.edu/examples/planes.xsd • XML pages are formatted with • CSS • http://perleybrook.umfk.maine.edu/examples/planescss.xml • http://perleybrook.umfk.maine.edu/examples/planes.css • XLST • http://perleybrook.umfk.maine.edu/examples/xslplanes.xml • http://perleybrook.umfk.maine.edu/examples/xslplanes.xsl

  28. How XML works

  29. Future of XML • XML is the lingua franca for Net Services, Microsoft’s .NET, Oracle, and many other Internet based distributed architectures. • All of HTML can be done in XML and has been in xHTML • XML resources • www.xml.com • www.xml.org • http://www.w3.org/XML/

  30. For next class • Finish reading through Chapter 28 • Assignment # 2 will be posted • Get ready for exam on Feb 3

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