See the net' See the net run' Run net run'

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See the net. See the net run. Run net run.

• Chapter 3 from Technology in Action

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What is the internet?
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What is the internet?

• A network of networks
• The largest network ever
• A network is a group of computer that can
  exchange data with each other

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What is the difference between the WWW and the
Internet

• Internet
• The network
• Protocol independent
• The Web
• HTTP / HTML
• Just web pages

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Who/When/Why did the net and the www get invented?

• Net
• ARPANET (Advanced Research Projects Agency
  Network)
• 1960s
• US Gov (Al Gore)
• Better communication for Cold War plans
• WWW
• Tim Berners-Lee (while _at_ Cerna)
• 15 Years Ago
• To share physics discoveries

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How does the net work
Joe
Bob
Jon
Ben
Jim
Billy
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How does the net work
Jim
Joe
Bob
ATL
ATH
Ben
Billy
Jon
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How does the net work
IB
Internet Backbone (Top Tier ISP)
ATL
ATH
Jim
Joe
Bob
Ben
Billy
Jon
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Client Server
C
S
Request
Hey Mr. Server Can I have a web page
Response
Sure you can Mr. Client here you go.
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What is an IP address?

• Address of a computer on the internet
• Assigned by your ISP
• A series of 4 bytes
• 64.233.161.99 (IP for www.google.com)

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Internet Hardware

• Hub (wireless)
• A Bus Architecture (not good for average home
  usage)
• Router (wireless)
• A Switched Network Architecture
• Repeater (wireless)
• A fancy Computer Science term for an amp
• Modem
• Modulates one type of signal into another type

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Domain Names and DNS

• Domain Name is the human readable form of an IP
  address
• Two Parts
• Top Level Domain
• .com, .edu, .gov, .us
• Host Name
• DNS maps Domain Names to IP address

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Tuvalu
The .TV top-level domain
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Different Type of Internet Connections

• Dial up
• DSL
• Cable
• Satellite
• T1
• T3
• Fiber Optic

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Dial Up

• Max Speed 56Kbps
• What about Internet Accelerator
• Uses the phone line
• Ties of the phone line
• American Online, Mindspring, CompuServe

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DSL

• Digital Subscriber Line
• Max speed 6 Mbps
• Bell South, ATT
• Uses the phone line
• Does not tie up the phone line
• Asymmetrical and Symmetrical Flavors

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Cable

• Comes to you house via coaxial cable
• Max speed 6 Mbps
• Does not tie up the TV
• Comcast, Charter
• Only Symmetrical Flavors
• Uses a Bus Architecture

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Satellite

• For people who live out in the Boondocks
• Max speed 400Kbps
• Your request is sent to the satellite then to a
  server. This server forwards your request to the
  internet. The reverse route is taken to get your
  response back to you.
• Looses signal in bad weather.

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Cable VS DSL
Comcast
Internet
Bellsouth
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ISP and OSP

• ISP (Internet Service Provider)
• The company that connects you to the internet
• Comcast, Bellsouth, Charter, ATT
• OSP (Online Service Provider)
• The company that connects you to the internet
• Provides added content
• Dieing Breed
• AOL, CompuServe, MSN

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URL

• Unified Resource Locator
• http//www.google.com/mdup/test/index.html?qhi
• Protocol
• Host
• Path
• Query String
• URI
• Unified Resource Identifier

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Protocols - HTTP

• Protocol is rules for conversation
• HTTP HyperText Transfer Protocol

C
S
Request
Can I GET page /test/index.html from host
www.google.com I am using HTTP version 1.2
Response
Here is page /test/index.html it is and html page
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Web Browsers

• Executes the client side part of the HTTP
  Protocol
• Can interpret HTML in to a graphic form
• Types
• IE (Internet Explorer) Most used, Most insecure
• Firefox Rising in Use, Tabbed Browser
• Netscape
• Safari Mac OSs default Browser
• Opera

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Cookie

• A small bit of information that is stored on your
  computer from a web site
• Used for session and tracking
• Third Party Tracking Cookies
• Demo for Yahoo Music Cookie
• Demo for GMail Cookie

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Browser Cleaning

• Cache ??
• Cookies
• History
• Download History
• Form Data
• Pop up blocker

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Plugins, Skins, and Extensions Oh My!

• Plug-ins Programs that run inside your browsers
  to handel certain types of content that your
  browser cannot
• Adobe Acrobat PDF
• Windows Media Player Movies, Sounds Clips
• Flash Flash
• Skins Change the appreance of your browser
• Extensions Programs that you can install that
  change how your browser works
• https//addons.mozilla.org/firefox/

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Search Engine

• Google
• Yahoo!
• MSN
• ASK
• Crawler Crawls all the web pages it can finds
  then feeds them to the indexer
• Indexer Makes a searchable map between page
  content and URL
• Page Rank
• How?

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Google Tricks

• Phone Book phonebook
• Double Quotes Jon Lathem
• Definitions definecurb weight
• Site admission sitewww.uga.edu
• Type uga filetypepdf
• Calculator 2 34 or 23 USD in Euros
• Boolean Logic chat OR cat, chat -yahoo
• Movie movie30608
• Weather weather30608
• Google Heaven

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E-Mail

• Advantages
• Asynchronous
• Audit Trail
• Instant
• Transport Documents
• Disadvantages
• Average mail is not secure
• Spam
• Junk Mail
• Phishing
• Embed or Attached Virus

• Web based
• GMail
• Hotmail
• Yahoo! Mail
• Standalone
• Outlook
• Thunderbird
• Things to Consider
• Limited Space
• Available Everywhere the WWW is

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Blog

• Online journal
• Used a lot as event notification for companies
• Blogger.com

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IM

• Synchronous compared to emails asynchronous style
• AIM, Yahoo! Messenger, MSN Messenger, Google Talk
• Aggregate programs like Gaim, Trillion, Adium

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ChatDanger.com
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RSS and More

• No news papers by 2040
• Really Simple Syndication
• News Feeds, Blog Feeds, etc
• RSS readers Firefox, GReader, Blog Lines
• http//rss.cnn.com/rss/cnn_topstories.rss
• Podcast

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Wikis

• http//en.wikipedia.org/wiki/Wiki
• Advantages ??
• Draw Backs ??

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AJAX Web 2.0

• Not the Internet 2.0
• Making web applications more like a desktop
• http//maps.google.com/ vs http//maps.yahoo.com
• www.sidestep.com
• http//www.digg.com/spy
• AJAX Asynchronous JavaScript API for XML

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Semantic Web
Web Page
Web Page
Attraction
Food
Web Page
Goods
Located in
Produces
Web Page
Company
Likes
Web Page
Place
Web Page
Person
Lives in
Works For
Web pages connecting by Hyper Links (Hrefs)
Objects connected by relationships
Benefits?
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Social Networks

• Facebook
• MySpace
• Friendster
• Websites used to create personal profiles share
  them with others and link to them as friends

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Top Sites March 2006
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Top Sites March 2006