1 / 45

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.

sheryl
Download Presentation

Objectives Overview

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  44. Chapter 8 Complete

More Related