1 telecommunications, the internet, intranets, and extranets csc101 sections 01 & 02
TRANSCRIPT
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Telecommunications, the Internet, Intranets, and Extranets
CSC101 SECTIONS 01 & 02
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Telecommunication Systems
Telecommunication Medium is anything that carries an electronic signal and interfaces between a sending device and a receiving device.
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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)
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Wiring and Cabling Types
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Telecommunication Devices
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DSL versus Cable Modems
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Compare Line and Service Types
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Computer Network
The communications media, devices, and software needed to connect two or more computer systems and/or devices
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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
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Terminal-to-Host Connection
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File Server Connection
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Client/Server Connection
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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)
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Local Area Network (LAN)
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Wide Area Network (WAN)
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Home Computer Network
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Terminology NOS (Network Operating System)
Allows all computers on the Network to communicate with each other
NMS (Network Management Software) Allows the network administrator to scan for
viruses and manage users facilities Communication Protocols
Rules and standards that make communication possible
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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
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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
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U.S. Top-Level Domains
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Accessing the Internet
SLIP
LAN AOL
ISP
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Internet Service Providers
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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
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Internet Services (con’t.)
On-line Music, Radio, and Video Telnet, FTP, and Content
Streaming Chat Rooms
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Videoconferencing
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Electronic Data Interchange
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Public Network Services
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The World Wide Web (WWW)
An Internet service compromising tens of thousands of independently owned computers that work together as one.
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Interesting Web Sites
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Interesting Web Sites
Monster.com Askme.com WebMD
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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>
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Search Engines
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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.
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Internet, Intranet, and Extranet
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Virtual Private Network
Tunneling – encapsulating IP’s to send over the Internet.
Firewall – sits between the intranet and the outside internet
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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)
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Cryptography