Internet and WWW TechnologiesPresentation Transcript
INTERNET AND WORLD WIDE WEB TECHNOLOGIES BUS3500 - Abdou Illia, Spring 2007 (Week 11, Thursday 3/22/2007)
Identify and describe the major Internet applications.
Define the World Wide Web and its operation.
Define intranets and extranets and explain how companies use them.
Test your Internet knowledge (1)
This week we saw that a network can be set in order to share software resources (like data files, databases, and programs) and hardware resources (like printers). In other words, we can say that a network can be set to provide file service, database service, and print service to users. Based on your Internet experience what kind of services users can get from the Internet?
Brief history of the Internet Domain Name System ( DNS ) established 1984 Denial of service attack knocks out 8/15 root DNS servers 2002 A major denial of service attack brings down websites such as Yahoo!, Amazon.com, and eBay 2000 First online shopping mall, first spam email, first pizza ordered online, first advertisement banner 1994 Tim Berners-Lee creates the World Wide Web 1991 USENET newsgroups created at Duke University and the University of North Carolina 1979 Ray Tomlison invents e-mail 1971 The Defense A dvanced R esearch P rojects developed ARPANET , the precursor of the Internet 1969
Test your Internet knowledge (2)
Based on your Internet experience what are the different types Internet connections a residential user or a business can subscribe for?
Accessing the Internet
Accessing the Internet (www)
Network Operating System - TCP/IP - Domain name (e.g. eiu.edu)
IP Address (e.g. 220.127.116.11)
User PC needs: - Workstation Operating System - TCP/IP - Web browser (e.g. Internet Explorer) - Internet access (e.g. thru an ISP) - IP Address (e.g. 18.104.22.168) Network Web Browser Packet Router Packet Route Webserver Software 7
A number that uniquely identify a computer connected to the Internet
Four decimal numbers separated by dots
Like a nickname given to a server
Two or more text “labels” separated by dots
Easier to remember compared to IP address
Domain Name System (DNS)
System for searching IP addresses based on domain names
Domain Name System (DNS)
Instant messaging (IM)
Streaming audio and video
World Wide Web (WWW)
Most popular and widely used Internet application
30 billion e-mails sent every day
Spam – junk e-mail messages
Spam costs corporate America $9 billion per year
Every e-mail message contains head that describes source and destination for the message
E-mail messages are text, but may have attachments of many types of digital data
Viruses often transmitted via e-mail
File transfer protocol (FTP)
Protocol providing for transmission of a file between an Internet server and a user’s computer
Peer-to-peer (P2P) file sharing
Share data from one computer to another
Every user can be a server and a client
With P2P, every user on the network can make data available to every other user on the network
Examples of P2P File transfer systems:
Allows user to create a private chat session with another user
IM started with AOL
Many Web-based companies use IM technology for customer service
State of Virginia
Online, bulletin board discussion forums
Users post and read messages
More than 100,000 newsgroups
Millions of newsgroup readers
Important information resource, especially for technical issues and products
Streaming Audio and Video
Creating and sending audio and video files
Men’s intercollegiate basketball at sports.yahoo.com
Major league baseball
Warriors of the Net
Also known as Podcasting
Uses Voice-over Internet Protocol (VoIP)
Can use your computer to make phone calls
Software connects computers via the Internet and transmits voice data
Savings comes from eliminating toll charges between locations
Intranets and Extranets
Internal company network that uses Internet and WWW technologies.
Finding and sharing work documents
Collaboration between employees to work in teams
Only authorized users can get access
Secured by firewall
Web site that allows customers and business partners limited access to organizational intranet
Uses Internet and WWW technologies
Add additional security through the use of a Virtual Private Network (VPN)
Summary Questions 19
(a) What is an intranet? (b) What is an extranet?
Name some Internet connection options available for residential users and businesses.
7 2) (a) What does a user PC needs for accessing the World Wide Web? (b) What is needed on the webserver side? 9-11
(a) What is a domain name? (b) What is Domain Name System or DNS?
12, 15, 16
(a) Name some Internet applications/services (b) What is Instant Messaging? (c) What is a newsgroup?