the internet, intranets, and extranets
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The Internet, Intranets, and Extranets. Chapter 7. Principles and Learning Objectives. - PowerPoint PPT PresentationTRANSCRIPT
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 1
The Internet, Intranets, and Extranets
Chapter 7
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Principles and Learning Objectives
• The Internet is like many other technologies—it provides a wide range of services, some of which are effective and practical for use today, others are still evolving, and still others will fade away from lack of use.
– Briefly describe how the Internet works, including alternatives for connecting to it and the role of Internet service providers.
– Identify and briefly describe the services associated with the Internet.
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 3
Principles and Learning Objectives
• Originally developed as a document-management system, the World Wide Web is a menu-based system that is easy to use for personal and business applications.
– Describe the World Wide Web and how it works.– Explain the use of Web browsers, search engines,
and other Web tools.
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Principles and Learning Objectives
• Before the Internet and the World Wide Web become universally used and accepted for business use, management issues; service and speed issues; and fraud, security, and unauthorized Internet sites must be addressed and solved.
– Identify who is using the Web to conduct business and discuss some of the pros and cons of Web shopping.
– Outline a process for creating Web content. – Describe Java and discuss its potential impact on the software
world. – Define the terms intranet and extranet and discuss how
organizations are using them. – Identify several issues associated with the use of networks.
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Use and Functioning of the Internet
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Use and Functioning of the Internet
• ARPANET• Internet Protocol (IP)• Wireless Internet• Research for a faster Internet
– Internet2 (I2)– Next Generation Internet (NGI)– Corporate efforts
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Routing Messages Over the Internet
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U.S. Internet Usage
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How the Internet Works
• Hosts• Routers forward packets to other networks• Internet Protocol Stack (TCP/IP)
– Internet Protocol (IP)– Transport Control Protocol (TCP)
• Backbones
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Uniform Resource Locator (URL)
• http://www.course.com
Hypertext transfer protocol
World Wide Web Domain category
Host Network Name
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U.S. Top Level Domain Affiliations
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Accessing the Internet
• Connection via a LAN server– Network adapter card– Open Datalink Interface (ODI)– Network Driver Interface Specification (NDIS)
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Accessing the Internet
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Internet Service Providers (ISPs)
• Provide Internet access to account holders• Monthly fee varies • Some are free
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Internet Service Providers (ISPs)
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Internet Services
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Internet Services
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Internet Services
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E-mail and Instant Messaging
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ICQ
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Usenet Newsgroups
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Internet Phone and Videoconferencing Services
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Other Internet Services
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The World Wide Web
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The World Wide Web
• Menu-based system that uses client/server model• Hypermedia• HTML, XML• Web browsers• Java• Search engines
– Keyword indexes: fast & broad– Subject indexes: focused searches
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Interesting Web Sites
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Hypertext Markup Language
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Popular Search Engines
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Java
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Java
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CVS.com
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Intranets and Extranets
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Intranet
• Internal corporate network built using Internet and World Wide Web standards and products
• Slashes the need for paper
• Provides employees with an easy and intuitive approach to access information that was previously difficult to obtain
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Intranet
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Extranet
• A network that links selected resources of the intranet of a company with its customers, suppliers, or other business partners.
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Internet, Intranet, and Extranet Users
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Virtual Private Network
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Developing Web Content
• Computer must be linked to a Web server• Need Web browser program• Add links to home page • Advertise• Tools
– Word processors– HTML editor– HTML template– Text editor
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Push Technology
• Used to send information automatically over the Internet
• Relies on HTTP or Java technology• Drawbacks include:
– Information overload– Volume of data broadcast
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Business Uses of the Web
• E-mail• Linking buyers and sellers• Tool for marketing, sales, and customer support• Low-cost alternative to fax or express mail
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Net Issues
• Management issues
• Service and speed issues– Routers can become bottlenecks– Connection agreements
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Net Issues
• Privacy– Cookie: text file placed on the hard disk of a computer system
• Fraud• Security with encryption and firewalls
– Digital signature– Cyphertext– Cryptography
• Unauthorized sites
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Cryptography
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FedCIRC
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The Web in Three Dimensions
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Summary• Internet - started with ARPANET, a project started by the
U.S. Department of Defense (DOD)
• Internet services include:– E-mail – Telnet– FTP– Usenet and newsgroups– Chat rooms
• Web site - like a magazine, with a cover page called a home page that has graphics, titles, black and highlighted text