1. CHAPTER 4
Networks

2. CHAPTER OUTLINE
4.1 What Is a Computer Network? 4.2 Network Fundamentals 4.3 The Internet and the World Wide Web 4.4 Network Applications

3. LEARNING OBJECTIVES
Compare and contrast the two major types of networks
Describe the wireline communications media and transmission technologies
Describe the most common methods for accessing the Internet
Explain the impact that networks have had on business and everyday life for each of the six major categories of network applications

4. 4.1 What Is a Computer Network?
Broadband
Local Area Networks
Wide Area Networks
Enterprise Networks

5. 4.2 Network Fundamentals Analog and Digital Signals
Communications Media and Channels
Transmission Technologies
Network Protocols
Types of Network Processing

6. Transmission Technologies
Digital subscriber line (DSL)
Asynchronous transfer mode (ATM)
Synchronous optical network (SONET)
T-carrier system

7. Network Protocols Ethernet
Transmission Control Protocol/Internet Protocol (TCP/IP)

8. Types of Network Processing
Client/server computing
Peer-to-peer processing

9. Types of Peer-to-Peer Processing
First Type
Second Type
Third Type

10. 4.3 The Internet and the World Wide Web
Accessing the Internet
The Future of the Internet
The World Wide Web

11. Accessing the Internet
Connecting via an online service
Internet kiosks
Dial-up
DSL
Cable Modem
Satellite
Wireless
Fiber to the home

12. Addresses on the Internet
Domain names
Top-level domain
Name of the organization
Name of the specific computer

13. The World Wide Web
Home page Uniform resource locator Browser Competition

14. 4.4 Network Applications Discovery Communication Collaboration
E-Learning and Distance Learning
Virtual Universities
Telecommuting

15. Discovery Search engines Metasearch engines
Discovery of material in foreign languages
Portals

16. Portals Commercial (public) portals Affinity portals Mobile portals
Corporate portals
Industrywide portals

17. Communication Electronic mail (e-mail)
Web-based call centers (customer call center)
Electronic chat room
Voice
Unified

18. Collaboration Work group Virtual group (team) Virtual collaboration
Collaboration software
Electronic Teleconferencing
E-Learning and Distance Learning

19. Benefits of E-Learning
Self-paced learning increases content retention.
Online materials deliver high-quality, current content.
Students have the flexibility of learning from any place at any time at their own pace.
Learning time generally is shorter, and more people can be trained due to faster training time.
Training costs can be reduced.

20. Drawbacks of E-Learning
Instructors may need training to be able to teach electronically.
The purchase of additional multimedia equipment may be necessary.
Students must be computer literate and may miss the face-to-face interaction with instructors.
There are issues with assessing students’ work, as instructors really do not know who completed assignments.

21. 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

22. 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

23. Closing Case #1 The Network Neutrality Wars
The Problem
The Solution
The Results

24. Closing Case #2: Marriott’s Corporate Portal
The Problem
The Solution
The Results