beekman5 std ppt_11
Post on 07-Nov-2014
577 Views
Preview:
DESCRIPTION
TRANSCRIPT
2002 Prentice Hall
Chapter 11
From Internet to Information
Infrastructure
2002 Prentice Hall 2
Topics
Internet Applications: Communication and ConnectionThe Evolving InternetInternet2 and the Next Generation InternetInternet Issues: Ethical and Political DilemmasInternet Everywhere: The Invisible Information InfrastructureCyberspace: The Electronic Frontier
2002 Prentice Hall 3
Internet Applications: Communication and Connection
Search engines are designed to make it easier to find information on the Web.
web crawlers or spiders --software robots that systematically search the web
2002 Prentice Hall 4
Search Engines
Some search engines use keywords and Boolean logic to conduct searches
2002 Prentice Hall 5
Search Engines
Other search engines allow searches by using a hierarchical directory or subject tree
2002 Prentice Hall 6
Portals
Web entry stations that offer quick and easy access to a variety of services. Consumer portals includes search engines, email services,
chat rooms, references, news and sports headlines, shopping malls and other services
Corporate portals on intranets serve the employees of particular corporations
Vertical portals are targeted at members of a particular industry or economic sector
2002 Prentice Hall 7
Rules of Thumb: Working the Web
Handle URLs with care.Get to know your search engines.If you’re in a hurry, dispense with frills.Organize your favorite bookmarks.Be selective.
Protect your privacy.Be conscious of cookies.Shop with bots.Shop smart.Remember why you’re there.Think before you publish.
2002 Prentice Hall 8
Email on the Internet
What appears on the screen depends on the type of Internet connection you have and the mail program you use.
Popular graphical email programs include Eudora, Outlook and Netscape Communicator.
2002 Prentice Hall 9
Email on the Internet
Email formats include:
ASCII text--can be viewed by any mail client program
HTML--displays text formatting, pictures, and links to Web pages
2002 Prentice Hall 10
Mailing Lists & Network News
Mailing lists allow you to participate in email discussion groups on special-interest topics.
A newsgroup is a public discussion on a particular subject consisting of notes written to a central Internet site and redistributed through a worldwide newsgroup network called Usenet
2002 Prentice Hall 11
Real-Time Communication
Users are logged in at the same time.
Instant Messaging for exchanging instant messages with on-line friends and co-workers
Internet telephony (IP telephony) for long-distance toll-free telephone service
Videoconferencing for two-way meetings
2002 Prentice Hall 12
Rules of Thumb: Netiquette
Say what you mean and say it with care.Keep it short and to the point.Proofread yours messages.Learn the “nonverbal” language of the Net.Keep your cool.Don’t be a source of spam (Internet junk mail).Lurk before you leap.Check your FAQs.Give something back.
2002 Prentice Hall 13
Push Technology
The Web was built with pull technology—browsers on client computers “pull” information from server machines. Browser asks for information
With push technology, information is delivered automatically to the client computer. New product descriptions Automatic software upgrades Updated news
2002 Prentice Hall 14
Peer-to-Peer and Grid Computing
Peer-to-Peer (P2P) computing - users share music, movies, and other files without going through a central directory.
Grid computing - anyone can plug in from anywhere and rent processing power and software from anywhere on the Net
2002 Prentice Hall 15
Intranets, Extranets and Electronic Commerce
Intranets are self-contained intra-organizational networks that offer email, newsgroups, file transfer, Web publishing and other Internet-like services.
Firewalls prevent unauthorized communication and secure sensitive internal data
2002 Prentice Hall 16
Intranets, Extranets and Electronic Commerce
Extranets are private TCP/IP networks designed for outside use by customers, clients and business partners of the organization. electronic data interchange (EDI - a decade-old set
of specifications for ordering, billing, and paying for parts and services over private networks
2002 Prentice Hall 17
Intranets, Extranets and Electronic Commerce
Electronic commerce involves business transactions through electronic networks. Business-to-business (B2B) e-commerce - transactions that
involve businesses providing goods or services to other businesses
Business-to-consumer (B2C) e-commerce - transactions that take place on the Internet, rather than an extranet, because consumers don’t have access to private extranets
2002 Prentice Hall 18
Web Services
Web services involve new kinds of Web-based applications that can be assembled quickly using existing software components
Examples: plug a shopping-cart component into an existing Web
site design applications that can be accessed through a
variety of Web-enabled devices
2002 Prentice Hall 19
The Evolving Internet
Internet2 launched by the government and various corporations in 1998 to provide faster network communications for universities and research institutions.
Next Generation Internet (NGI), will consist of a nationwide web of optical fiber integrated with intelligent management software to maintain high-speed connections.
2002 Prentice Hall 20
Internet Issues: Ethical and Political Dilemmas
Filtering software to combat inappropriate content
Digital cash to make on-line transactions easier and safer
Encryption software to prevent credit card theft
Digital signatures to prevent email forgery
2002 Prentice Hall 21
Internet Everywhere: The Invisible Information Infrastructure
Blurring of the boundaries between the Web and interpersonal communication applications
A variety of Internet appliances, network computers, set-top boxes, PDAs, mobile phones, and other devices connected to the Internet in offices and homes
“In the future, everything with a digital heartbeat will be connected to the Internet.”
Scott McNealy, CEO of Sun Microsystems
2002 Prentice Hall 22
top related