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Transcript
Telecommunications, the Internet, Intranets, and Extranets CSC101 SECTIONS 01 & 02 1 Telecommunication Systems Telecommunication Medium is anything that carries an electronic signal and interfaces between a sending device and a receiving device. 2 Media Types Twisted-pair wire cable (Telephone) Coaxial cable (Cable and Telephone) Fiber-optic cable (Higher Speed, Smaller) Microwave transmission (No cable, High spd) Cellular transmission (Mobile users) Infrared transmission (Unobstructed line of sight, Move and reinstalled) 3 Wiring and Cabling Types 4 Telecommunication Devices 5 DSL versus Cable Modems 6 Compare Line and Service Types 7 Computer Network The communications media, devices, and software needed to connect two or more computer systems and/or devices 8 Data Processing Strategies Centralized Processing: all processing occurs in a single location or facility Decentralized Processing: processing devices are placed at various remote locations Distributed Processing: computers are placed at remote locations and connected via telecommunication devices 9 Terminal-to-Host Connection 10 File Server Connection 11 Client/Server Connection 12 Client/Server Advantages Reduce cost (potential) Improve performance Increase security Disadvantages Increase Cost of managing network Loss of control Administration can be difficult Complex systems (Internal and External users) 13 Local Area Network (LAN) 14 Wide Area Network (WAN) 15 Home Computer Network 16 Terminology NOS (Network Operating System) NMS (Network Management Software) Allows all computers on the Network to communicate with each other Allows the network administrator to scan for viruses and manage users facilities Communication Protocols Rules and standards that make communication possible 17 The Internet ARPANET – Advanced Research Project Agency, Now is called DARPA UCAID – University Corporation for Advanced Internet Development Internet add hoc linkage of many networks 18 Internet Protocols Internet Protocol (IP): standard that enables traffic to be routed from one network to another as needed Transport Control Protocol (TCP): rules that computers on a network use to establish and break connections Uniform Resource Locater (URL): an assigned address on the Internet for each computer Backbone High-speed, long distance links 19 U.S. Top-Level Domains 20 Accessing the Internet LAN SLIP AOL ISP 21 Internet Service Providers 22 Internet Services Voice Mail, Electronic Mail, and Instant Messaging Telecommuting, Videoconferencing, and Internet Phone Service Electronic Data Interchange (EDI) Public Network and Specialized Services Distance Learning 23 Internet Services (con’t.) On-line Music, Radio, and Video Telnet, FTP, and Content Streaming Chat Rooms 24 Videoconferencing 25 Electronic Data Interchange 26 Public Network Services 27 The World Wide Web (WWW) An Internet service compromising tens of thousands of independently owned computers that work together as one. 28 Interesting Web Sites 29 Interesting Web Sites Monster.com Askme.com WebMD 30 Hypertext Markup Language (HTML) <!-- Header --> <HTML> <head> <meta name="generator" content="Microsoft FrontPage 4.0"> <BASE href="http://www.askmecorp.com/" /> <!-- BEGIN WEBSIDESTORY CODE v6.1 --> <!-- COPYRIGHT 1997-2000 WEBSIDESTORY, INC. ALL RIGHTS RESERVED. U.S.PATENT PENDING. Privacy notice at: http://websidestory.com/privacy -> <META name="description" content="Askme Corporation is a knowledge sharing Company"></META> 31 Search Engines 32 Intranets and Extranets Intranet An internal corporate network built using Internet and World Wide Web standards and products; used by the employees of the organization to access corporate information. Extranet A network that links selected resources of the intranet of a company with its customers, suppliers, or other business partners; based on Web technologies. 33 Internet, Intranet, and Extranet 34 Virtual Private Network Tunneling – encapsulating IP’s to send over the Internet. Firewall – sits between the intranet and the outside internet 35 Net Issues Management Issues Managed at the local level IAB Internet Activities Board (TCP/IP) Service Bottlenecks Corporate intranet traffic is growing faster then internet traffic Recapturing missing packets Privacy and Security (Next Lecture) 36 Cryptography 37
