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Objectives Overview

Objectives Overview. See Page 313 for Detailed Objectives. Objectives Overview. See Page 313 for Detailed Objectives. Communications. Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information. Page 314.

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Objectives Overview

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  1. Objectives Overview See Page 313 for Detailed Objectives Discovering Computers Fundamentals, 2012 Edition Chapter 8

  2. Objectives Overview See Page 313 for Detailed Objectives Discovering Computers Fundamentals, 2012 Edition Chapter 8

  3. Communications • Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information Page 314 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  4. Communications Pages 314 – 315 Figure 8-1 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  5. Uses of Computer Communications Page 316 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  6. Uses of Computer Communications • Users can send and receive wireless messages using wireless messaging services Page 317 Figure 8-3 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  7. Uses of Computer Communications Pages 317 - 318 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  8. Uses of Computer Communications • Wireless Internet access pointsallow people to connect wirelessly to the Internet from home, work, school, and in many public locations Pages 318 – 319 Figure 8-4 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  9. Uses of Computer Communications • A cybercaféis a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customers Page 319 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  10. Uses of Computer Communications • A global positioning system (GPS) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the GPS receiver’s geographic location • GPS receivers are: Page 320 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  11. Uses of Computer Communications Page 320 Figure 8-5 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  12. Uses of Computer Communications • Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users Page 321 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  13. Uses of Computer Communications Page 321 Figure 8-6 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  14. Uses of Computer Communications Pages 321 - 322 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  15. Uses of Computer Communications • Web services enable programmers to create applications that communicate with other remote computers over the Internet or on an internal business network • A mashup is a Web application that combines services from two or more sources Page 322 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  16. Networks • A network is a collection of computers and devices connected together via communications devices and transmission media • Advantages of a network include: Page 322 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  17. Networks • A local area network(LAN) is a network that connects computers and devices in a limited geographical area • A wireless LAN (WLAN) is a LAN that uses no physical wires Page 323 Figure 8-7 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  18. Networks • A metropolitan area network (MAN) connects LANs in a metropolitan area • A wide area network (WAN) is a network that covers a large geographical area Page 324 Figure 8-8 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  19. Networks • The design of computers, devices, and media on a network is sometimes called the network architecture Client/server network Peer-to-peer network Page 325 Figures 8-9 – 8-10 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  20. Networks • P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the Internet Page 326 Figure 8-11 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  21. Networks • A network topologyrefers to the layout of the computers and devices in a communications network Star network Bus network Ring network Pages 326 – 328 Figures 8-12 – 8-14 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  22. Networks Page 328 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  23. Network Communications Standards Pages 329 - 330 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  24. Network Communications Standards Page 329 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  25. Network Communications Standards • Wi-Fiidentifies any network based on the 802.11 standard that facilitates wireless communication • Sometimes referred to as wireless Ethernet Page 329 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  26. Network Communications Standards • Bluetooth defines how two Bluetooth devices use short-range radio waves to transmit data • UWB (ultra-wideband) specifies how two UWB devices use short-range radio waves to communicate at high speeds • IrDA transmits data wirelessly via infrared (IR) light waves • RFIDuses radio signals to communicate with a tag placed in or attached to an object, animal, or person Pages 329 - 330 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  27. Network Communications Standards Page 330 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  28. Communications Software • Communications softwareconsists of programs that: Page 330 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  29. Communications Over the Telephone Network • The public switched telephone network (PSTN) is the worldwide telephone system Page 331 Figure 8-15 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  30. Communications Over the Telephone Network Pages 331 - 332 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  31. Communications Over the Telephone Network Page 332 Figure 8-16 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  32. Communications Devices • A communications deviceis any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device • A dial-up modem converts signals between analog and digital Page 333 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  33. Communications Devices • A digital modem sends and receives data and information to and from a digital line Page 333 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  34. Communications Devices Page 333 Figure 8-17 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  35. Communications Devices • A wireless modemuses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device Page 334 Figure 8-18 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  36. Communications Devices • A network cardenables a computer or device to access a network • Available in a variety of styles • Wireless network cards often have an antenna Pages 334 – 335 Figure 8-19 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  37. Communications Devices • A wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network • A router connects multiple computers or other routers together and transmits data to its correct destination on a network • Many are protected by a hardware firewall Page 335 Figure 8-20 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  38. Home Networks • Home networks provide computers with the following capabilities: Page 336 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  39. Home Networks Page 337 Figure 8-21 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  40. Communications Channel • The amount of data that can travel over a communications channel sometimes is called the bandwidth • Transmission media carries one or more signals • Broadband media transmit multiple signals simultaneously Pages 337 - 338 Figure 8-22 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  41. Physical Transmission Media Twisted-pair cable Fiber-optic cable Coaxial cable Pages 339 - 340 Figures 8-23 – 8-25 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  42. Wireless Transmission Media Page 341 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  43. Video: Got Your Video Right Here CLICK TO START Discovering Computers Fundamentals, 2012 Edition Chapter 8

  44. Summary Page 342 Discovering Computers Fundamentals, 2012 Edition Chapter 8

  45. Chapter 8 Complete

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