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CHAPTER 7

CHAPTER 7. NETWORKS, TELECOMMUNICATIONS, AND WIRELESS COMPUTING. 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

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CHAPTER 7

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  1. CHAPTER 7 NETWORKS, TELECOMMUNICATIONS, AND WIRELESS COMPUTING

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

  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. 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. NETWORK BASICS

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

  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. 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. 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. TOPOLOGY

  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. Open Source Interconnection Model (OSI)

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

  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. 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. 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. 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: • Twisted-pair wiring • Coaxial cable • Fiber optic (or optical fiber)

  20. Wire Media

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

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

  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. 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. 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. RFID

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

  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

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