1. The Internet, Intranets, & Extranets Chapter 7

2. IS for Management2 The Internet (1) A collection of networks that pass data around in packets, each of which carries the addresses of its sender & receiver  Routers determine where each packet should be sent & forward the packet appropriately  Transmission Control Protocol (TCP): A protocol that together with the IP protocol is used by most Internet applications (TCP/IP) (see Chapter 6)

3. Chapter 7IS for Management3 The Internet (2)  Backbone: High-speed (>T1) long distance links between routers  Uniform Resource Locator (URL): An assigned Internet address on the Web for each Web site, e.g., http://www.ngi.gov

4. Chapter 7IS for Management4 Top-Level Domain Affiliations (Extensions) on the Internet.comCommercial organization.eduEducational organization.govGovernmental agency/organization.milMilitary branch/agency.netNetworking organization.orgNot-for-profit organization.caCanadian organization.ukUnited Kingdom organization

5. Chapter 7IS for Management5 Accessing the Internet  LAN Servers  Serial Line Internet Protocol (SLIP) & Point- to-Point Protocol (PPP)  Communications protocol software that transmits packets over telephone lines  Dial-up access to the Internet  Connection via On-Line Services, e.g., AOL, Microsoft Network (MSN)

6. Chapter 7IS for Management6 Internet Service Providers (ISPs)  A company that provides individuals or companies with access to the Internet  Thousands of providers worldwide  Need an account with the ISP & software that uses TCP/IP  CN ISPs include Sympatico, Escape, etc.

7. Chapter 7IS for Management7 Internet Services (1) World Wide Web: Information search & retrieval

8. Chapter 7IS for Management8 Internet Services (2)  Voice Over IP (VOIP): Technology that enables network managers to route phone calls & fax transmissions over the same network they use for data; uses codec devices to compress data/voice for transmission  Content Streaming: A method of transferring multimedia files over the Internet so that the data stream of voice & pictures begins to play or can be read quickly, rather than waiting for the entire file to download

9. Chapter 7IS for Management9 The World Wide Web (1) A collection of independently owned computers that work together as a single Internet service  Home Page: The index page for a Web site that is normally accessed first  Hypermedia: Files & linkages (hyperlinks) that connect the data on Web pages to other Web pages & URLs, allowing users to access topics in whatever order they wish  Hypertext Markup Language (HTML): The standard programming language in which Web pages are written  Java: Object-oriented programming language from Sun Microsystems based on C++ that allows small programs (applets) to be embedded within an HTML document The Web WWW W3

10. Chapter 7IS for Management10 The World Wide Web (2)  Web Browser: Applications software that provides a graphical interface to the Web  Web Page: A file, typically written in HTML, that is presented through a browser  Applet: A small program embedded within a Web page, normally written in Java or Javascript

11. Chapter 7IS for Management11 Intranets & Extranets  Intranet: An internal corporate network that uses Internet & Web standards to allow employees to access corporate information  Extranet: A network based on Web technologies that links an organization with its customers, suppliers, & business partners (not available to the public)  Firewall: Hardware or software that functions between an internal network & the outside world & limits access in & out of the internal network based on the organization’s access policy

12. Chapter 7IS for Management12 Internet Issues  Management Issues  No centralized governing body for the Internet  Capacity & reliability may vary among ISPs/carriers  Service Bottlenecks  Phenomenal growth has left a service void  Providers underestimate computing power needed (e.g., AOL crashed three times in one month last year)  Reconciling router addresses needed to transverse the network

13. Chapter 7IS for Management13 Net Issues - Privacy & Security (1) Encryption & Decryption The conversion of a message into a secret code. Digital Signature An encryption technique used for online financial transactions.

14. Chapter 7IS for Management14 Net Issues - Privacy & Security (2)  Firewalls: Look only at packet header  Assured Pipeline: Looks at the entire request for data & then determines whether the request is valid

15. Chapter 7IS for Management15 Case for discussion  US West Communications, pp. 331-332