1. McGraw-Hill/Irwin ©2008 The McGraw-Hill Companies, All Rights Reserved CHAPTER 7 NETWORKS, TELECOMMUNICATIONS, AND WIRELESS COMPUTING

2. 7-2 Chapter Seven Overview SECTION 7.1 – NETWORKS AND TELECOMMUNICATIONS –Network Basics –Architecture –Topology –Protocols –Media –E-Business Networks SECTION 7.2 – WIRELESS COMPUTING –Wireless Fidelity –Business Drivers for Wireless Technologies –Advantages of Enterprise Mobility –The Future of Wireless

3. 7-3 LEARNING OUTCOMES 1.Compare LANs, WANs, and MANs 2.List and describe the four components that differentiate networks 3.Compare the two types of network architectures 4.Explain topology and the different types found in networks 5.Describe TCP/IP along with its primary purpose 6.Identify the different media types found in networks

4. 7-4 NETWORK BASICS Telecommunication system - enable the transmission of data over public or private networks Network - a resource-sharing system created by linking two or more computers following an establishing standards or protocols

5. 7-5 NETWORK BASICS The three types of networks include: –Local area network (LAN): One building, a small group of buildings, office, or a home. Metropolitan area network (MAN): Joins LANS across campuses Wide area network (WAN): Across the country or around the world (Internet)

6. 7-6 NETWORK BASICS

7. 7-7 NETWORK BASICS Networks are differentiated by the following: –Architecture - peer-to-peer, client/server –Topology - bus, star, ring, hybrid, wireless –Protocols - Ethernet, Transmission Control Protocol/Internet Protocol (TCP/IP) –Media - coaxial, twisted-pair, fiber-optic

8. 7-8 ARCHITECTURE There are two primary types of architectures –Peer-to-peer (P2P) network –Client/server network –http://www.youtube.com/watch?v=Ve7_4ot- Dzshttp://www.youtube.com/watch?v=Ve7_4ot- Dzs

9. 7-9 Peer-to-Peer Networks Peer-to-peer (P2P) network - any network without a central file server and in which all computers in the network have access to the public files located on all other workstations

10. 7-10 Client/Server Networks Client - a computer that is designed to request information from a server Server - a computer that is dedicated to providing information in response to external requests –Client/server network - model for applications in which the bulk of the back-end processing takes place on a server, while the front-end processing is handled by the clients

11. 7-11 TOPOLOGY Network topology - refers to the geometric arrangement of the actual physical organization of the computers and other network devices) in a network –Bus –Star –Ring –Hybrid –Wireless

12. 7-12 TOPOLOGY

13. 7-13 PROTOCOLS Protocol - a standard that specifies the format of data as well as the rules to be followed during transmission (e.g. language) Interoperability - the capability of two or more computer systems to share data and resources, even though they are made by different manufacturers

14. 7-14 Open Source Interconnection Model (OSI)

15. 7-15 Ethernet Ethernet - a physical and data layer technology for LAN networking

16. 7-16 Transmission Control Protocol/ Internet Protocol Transmission Control Protocol/Internet Protocol (TCP/IP) - provides the technical foundation for the public Internet as well as for large numbers of private network TCP/IP applications –File transfer protocol (FTP) –Simple mail transfer protocol (SMTP) –Hypertext transfer protocol (HTTP) –Simple network management Protocol (SNMP)

17. 7-17 Voice over IP (VoIP) Voice over IP (VoIP) - uses TCP/IP technology to transmit voice calls over long-distance telephone lines Can you recall some companies that offer VOIP?

18. 7-18 MEDIA Network transmission media - refers to the various types of media used to carry the signal between computers –Wire media (guided) –Wireless media (unguided)

19. 7-19 Wire Media Wire media - transmission material manufactured so that signals will be confined to a narrow path and will behave predictably Three most commonly used types include: 1.Twisted-pair wiring 2.Coaxial cable 3.Fiber optic (or optical fiber)

20. 7-20 Wire Media

21. 7-21 Wireless Media Wireless media - natural parts of the Earth’s environment that can be used as physical paths to carry electrical signals Wireless fidelity (wi-fi) – a means of linking computers using infrared or radio signals Common examples of wireless devices include: –Cellular phones and pagers –Global positioning systems (GPS) –Cordless computer peripherals –Home-entertainment-system control boxes –Two-way radios –Satellite television

22. 7-22 WIRELESS FIDELITY (WI-FI) Disruptive wireless technologies –WiMax wireless broadband –Radio frequency identification tags (RFID)

23. 7-23 The Value of Timely Information Timeliness is an aspect of information that depends on the situation –Real-time information – immediate, up-to- date information –Real-time system – provides real-time information in response to query requests

24. 7-24 BUSINESS DRIVERS FOR WIRELESS TECHNOLOGIES Mobile and wireless are often used synonymously, but actually denote two different technologies –Mobile technology - means the technology can travel with the user, but it is not necessarily in real-time –Wireless technology - gives users a live (Internet) connection via satellite or radio transmitters

25. 7-25 BUSINESS DRIVERS FOR WIRELESS TECHNOLOGIES Drivers of wireless technology growth include: –Universal access to information and applications –The automation of business processes –User convenience, timeliness, and ability to conduct business 24x7

26. 7-26 Technology Adoption (US) Forbes Magazine July 7th, 1997

27. 7-27 BUSINESS DRIVERS FOR WIRELESS TECHNOLOGIES Wireless devices changing business include: –Wireless local area network (wLAN) –Cellular phones and pagers –Cordless computer peripherals –Satellite television –WiMax wireless broadband –Security sensor

28. 7-28 Bluetooth Bluetooth – an omnidirectional wireless technology that provides limited-range voice and data transmission over the unlicensed 2.4-GHz frequency band, allowing connections with a wide variety of fixed and portable devices that normally would have to be cabled together

29. 7-29 Radio Frequency Identification Radio frequency identification (RFID) - use active or passive tags in the form of chips or smart labels that can store unique identifiers and relay this information to electronic readers RFID tag - contains a microchip and an antenna, and typically work by transmitting a serial number via radio waves to an electronic reader, which confirms the identity of a person or object bearing the tag

30. 7-30 RFID

31. 7-31 Satellite Microwave transmitter – commonly used to transmit network signals over great distances

32. 7-32 Global Positioning System Global positioning system (GPS) – a device that determines current latitude, longitude, speed, and direction of movement –Market for GPS services is at $5 billion with expectations for the demand to double over the next five years Geographic information system (GIS) – designed to work with information that can be shown on a map