Download Ch06

CHAPTER 6
Networks
Announcements
 Quiz 1 Grades Poster
 Project 3 – Access Case
 Due Tuesday before midnight
 Tuesday Class – Review and Workday on Project
 Midterm next Thursday

Tuesday will be a midterm review
Web Traffic and Net Neutrality
What Is a Computer Network?
Computer at organizations do not work in isolation.
In a computer network,
connected computers:
1.
2.
3.
© Ilin Sergey/Age Fotostock America, Inc.
Size of Computer Networks
Home computer network
National computer network
Global computer network
INTERNET
Types of Networks
Network Fundamentals - Outline
 Analog and Digital Signals
 Communications Media and Channels
 Transmission Technologies
 Network Protocols
 Types of Network Processing
Analog and Digital Signals
Communications Media and Channels
Twisted-pair wire
Coaxial cable
Fiber optics
Sources: deepspacedave/Shutterst ock, GIPhotoStock/Photo Researchers, Inc, Philip Hatson/Photo Researchers
Transmission Technologies
How messages are sent:
Network Protocols
Most companies use Ethernet in their LAN
Transmission Control Protocol/Internet
Protocol (TCP/IP)
Message Transmission:
Packet Switching
Types of Network Processing
Internet and World Wide Web - Outline
 Organizational use (Intranet vs. Extranet)


Intranet
Extranet
 Internet



Accessing the Internet
The Future of the Internet
The World Wide Web
Accessing the Internet
Connecting via an online service


ISP – Internet Service Provider
NAP – Network Access Point
Connection Methods:




Addresses on the Internet
How do you get to a web address?
Domain names
www.uncw.edu
The Future of the Internet
http://www.akamai.com/html/technology/
dataviz1.html
http://www.internettrafficreport.com/
The World Wide Web
World Wide Web
Categories of Network Applications
How do businesses use networks to improve
their operations?
 Discovery
 Communication
 Collaboration
 E-Learning and Distance Learning
 Virtual Universities
 Telecommuting
Network Applications:
Discovery
Search engines
Metasearch engines
Browsers
Network Applications:
Communication
 Electronic mail (e-mail)
 Web-based call centers (customer call
center)
 Electronic chat room
 Voice
© Mario S Ragma Jr/Age Fotostock America, Inc.
 Unified
(integration of different forms of communication)
Voice Communication
Two examples of Internet telephony (VoIP)
Skype
Vonage
Network Applications:
Collaboration
Types of collaboration:


Work group
Virtual group (team)
Virtual collaboration and Technologies:



Collaboration software
Electronic Teleconferencing
E-Learning and Distance Learning
Telepresence Systems
Source: PRNews Foto/Polycom, Inc./NewsCom
See video on Cisco Magic
Network Applications:
Telecommuting
Benefits:
 For Employees
 For Employers
Network Applications:
Telecommuting
Disadvantages:
 For Employees
 For Employers
Questions
Explain how the Internet works. Assume you
are talking with someone who has no
knowledge of information technology (in other
words, keep it very simple).
How are the network applications of
communication and collaboration related? Do
communication tools also support
collaboration? Give examples.