1. CHAPTER 6
Networks

2. What Is a Computer Network?
Computer at organizations do not work in isolation.
In a computer network,
connected computers:
Work together
Are interdependent
Exchange data with
each other
© Ilin Sergey/Age Fotostock America, Inc.

3. Size of Computer Networks
Home computer network
National computer network
Global computer network
INTERNET

4. Types of Networks
Local Area Network
Wide Area Network

5. Network Fundamentals - Outline
Analog and Digital Signals
Communications Media and Channels
Transmission Technologies
Network Protocols
Types of Network Processing

6. Analog and Digital Signals

7. Communications Media and Channels
Twisted-pair wire Coaxial cable Fiber optics
Sources: deepspacedave/Shutterst ock, GIPhotoStock/Photo Researchers, Inc, Philip Hatson/Photo Researchers

8. Transmission Technologies
Digital subscriber line (DSL)
Synchronous optical network (SONET)
T-carrier system

9. How messages are sent: Network Protocols
Most companies use Ethernet in their LAN Transmission Control Protocol/Internet Protocol (TCP/IP)

10. Message Transmission: Packet Switching

11. Internet and World Wide Web - Outline
Organizational use (Intranet vs. Extranet)
Intranet – internal to the organization
Extranet – external and internal network
Accessing the Internet
The Future of the Internet
The World Wide Web

12. Accessing the Internet
Connecting via an online service
ISP – Internet Service Provider
NAP – Network Access Point
Connection Methods:
Dial-up
DSL
Cable Modem
Fiber to the Home

13. Addresses on the Internet
How do you get to a web address?
Domain names
Name of the specific computer: business
Name of the organization:
Auburn University
Top level domain: edu

14. Web Traffic and Net Neutrality

15. The Future of the Internet

16. The World Wide Web World Wide Web Not the same thing as the Internet
Uniform resource locator
IPv4 vs. IPv6

17. Categories of Network Applications
How do businesses use networks to improve their operations?
Discovery
Communication
Collaboration
E-Learning and Distance Learning
Virtual Universities
Telecommuting

18. Network Applications: Discovery
Search engines
Metasearch engines
Browsers
2012
Internet Explorer
Firefox
Chrome
Safari
Opera
August
16.2 %
32.8 %
43.7 %
4.0 %
2.2 %
July
16.3 %
33.7 %
42.9 %
3.9 %
2.1 %
June
16.7 %
34.4 %
41.7 %
4.1 %
May
18.1 %
35.2 %
39.3 %
4.3 %
April
18.3 %
35.8 %
38.3 %
4.5 %
2.3 %
March
18.9 %
36.3 %
37.3 %
4.4 %
February
19.5 %
36.6 %
January
20.1 %
37.1 %
35.3 %
2.4 %

19. Network Applications: Communication
Electronic mail ( )
Web-based call centers (customer call center)
Electronic chat room
Voice
Unified (integration of different forms of communication)
© Mario S Ragma Jr/Age Fotostock America, Inc.

20. Voice Communication Two examples of Internet telephony (VoIP) Skype
Vonage

21. Network Applications: Collaboration
Types of collaboration:
Work group
Virtual group (team)
Virtual collaboration and Technologies:
Collaboration software
Electronic Teleconferencing
E-Learning and Distance Learning

22. Telepresence Systems See video on Cisco Magic
Source: PRNews Foto/Polycom, Inc./NewsCom
See video on Cisco Magic

23. Network Applications: Telecommuting
Benefits:
For Employees
Reduced stress, improved family life
Employment opportunities for single parents and persons with disabilities
For Employers
Increased productivity
Ability to retain skilled employees

24. Network Applications: Telecommuting
Disadvantages:
For Employees
Feelings of isolation
No workplace visibility
Potential for slower promotions
For Employers
Difficulties in supervising work
Potential information security problems
Additional training costs

25. 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.