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1. Introduction to MIS Chapter 3
Networks and Telecommunications
2. Networks
3. Outline Introduction
Sharing Data
Sharing Hardware
Sharing Software
Components of a Network
Computers
Media
Connection Devices
Software
Network Structure
Shared Media
Switched Standards
The Internet
How the Internet Works
Internet 2
Mobile Commerce
Global Telecommunications
Technical Problems
Political Complications
Cultural Issues
Comment
Cases: Specialty Retail
Appendix: Creating Web Pages
4. Sharing Data: Transactions
5. Sharing Data: Decisions & Searches Decisions & searches
Teamwork & joint authorship
6. Sharing Data: E-mail
7. Sharing Data: Calendars
8. Hardware Sharing Printers
Storage
Processors Files are transferred from workstations to the server.
Software automatically copies files to tapes.
LAN administrator can restore files if needed.
9. Packet-Switched Networks Data, Voice, Video
All converted to packets
Packet has data, destination, and source address
Switched services
Packets routed as needed
Reassembled at destination
10. Network Components Computers
Servers
Work stations
Media
Cables
Fiber optic
Radio
Infrared
Connection devices
11. Server Scalability
12. Network Transmission Media Wired:
Electricity
Fiber optics
Wireless
Radio waves
Infrared
13. Fiber Optics Faster
More data
Less magnetic interference
Long stretches without repeaters
16. Frequency Spectrum All waves behave similarly
Sound
Radio
Micro
Light
Frequency differences
Amount of data
Distance
Interference / Noise
18. Telecom Services
19. The Importance of Bandwidth
20. Shared Connections
21. Time Division
22. Frequency Division
23. Spread Spectrum
24. WirelessCommunication
25. Connecting Networks The need for standards
A changing environment
26. Shared-Media Network
27. Switched Network
28. Enterprise Network
29. Client/Server Network Client server
Peer-to-peer
Operating system
Multitasking
30. TCP/IP Reference Application
Mail, Web, FTP
Authentication, compression, user services
Transport
Packetize data and handle lost packets
Establish connections through numbered ports
Internet Protocol (IP)
Route packets to destination
Requires unique host addresses: IPv4=32-bit; IPv6=128-bit
Requires standards and cooperation
Subnet
Physical connections
Transfers bits with some form of error correction
31. ISO-OSI Reference Model
32. Introduction to the Internet No control
Services
Mail
Telnet
FTP
WWW
WEB searching
AltaVista
HotBot
Lycos
WebCrawler
Yahoo
33. How the Internet Works
34. Internet Connections Backbone providers
AT&T
GTE
Worldcom/MCI
Sprint
Qwest
Network service providers
1998: 39
AGIS
AT&T
Cable & Wireless
IBM
MCI/Worldcom
Qwest
Sprint
UUNet Phone companies
Regional Bell operating companies (RBOCs) (6)
Competitive local exchange carriers (CLECs) (new)
Cable companies
AT&T
Cablevision
Regional.
Satellite
Direct Satellite
Starband
Internet service providers
America Online
Microsoft Network
Earthlink
35. M-Commerce
36. Cell Phones and Wireless Communication
37. Global Telecommunications Technical problems
Multiple standards
Language
Developing nations
Time zones
Limits to space & waves
Political complications
Transborder data flows
Taxes
Privacy
Accessibility
Cultural issues
What is an object?
Management & control