Telecommunications, the Internet, Intranets, and Extranets

Transcript Telecommunications, the Internet, Intranets, and Extranets

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.
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Media Types
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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
4
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
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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
10
File Server Connection
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Client/Server Connection
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Client/Server
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Advantages
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Reduce cost (potential)
Improve performance
Increase security
Disadvantages
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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
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NOS (Network Operating System)
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NMS (Network Management Software)
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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
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Rules and standards that make communication
possible
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The Internet
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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
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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
LAN
SLIP
AOL
ISP
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Internet Service Providers
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Internet Services
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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.)
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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)
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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
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Monster.com
Askme.com
WebMD
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Hypertext Markup Language (HTML)

<HTML>
<head>
<meta name="generator" content="Microsoft FrontPage 4.0">
<BASE href="http://www.askmecorp.com/" />

<!-- 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
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Intranet
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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
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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
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Management Issues
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Managed at the local level
IAB Internet Activities Board (TCP/IP)
Service Bottlenecks
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Corporate intranet traffic is growing faster
then internet traffic
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Recapturing missing packets
Privacy and Security (Next Lecture)
36
Cryptography
37

Telecommunications, the Internet, Intranets, and Extranets

Transcript Telecommunications, the Internet, Intranets, and Extranets

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