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Networks and Communications

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Chapter 09 Presentation Transcript

  • 1. Chapter 9Networks and CommunicationsDiscovering Computers 2012 Your Interactive Guide to the Digital World
  • 2. Objectives Overview Discuss the purpose of the List advantages of using a components required for Describe the uses of network, and differentiatesuccessful communications computer communications among LANs, MANs, andand identify various sending WANs and receiving devices Differentiate between client/server and peer-to- Differentiate among a star Describe the various peer networks, and network, bus network, and network communications describe how a P2P ring network standards network worksSee Page 459 Discovering Computers 2012: Chapter 9 2for Detailed Objectives
  • 3. Objectives Overview Describe various types Explain the purpose of Describe commonly of lines for communications used communications communications over software devices the telephone network Discuss different ways Describe various to set up a home physical and wireless network transmission mediaSee Page 459 Discovering Computers 2012: Chapter 9 3for Detailed Objectives
  • 4. Communications• Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information Communications Sending device Receiving device channelPage 460 Discovering Computers 2012: Chapter 9 4
  • 5. CommunicationsPages 460 – 461 Discovering Computers 2012: Chapter 9 5Figure 9-1
  • 6. Uses of Computer Communications Blogs Chat rooms E-mail Fax Instant FTP Internet Newsgroups messaging Video RSS VoIP Web conferencing Web 2.0 Web folders WikisPage 462 Discovering Computers 2012: Chapter 9 6
  • 7. Uses of Computer Communications• Users can send and receive wireless messages using wireless messaging servicesPages 462 – 463 Discovering Computers 2012: Chapter 9 7Figure 9-3
  • 8. Uses of Computer CommunicationsText messaging (SMS) allows users to send and receive shorttext messages on a phone or other mobile device or computerPicture messaging allows users to send pictures and sound filesVideo messaging allows users to send short video clipsWireless instant messaging allows wireless users to exchangereal-time messages with one or more other usersPages 463 - 464 Discovering Computers 2012: Chapter 9 8
  • 9. Uses of Computer Communications• Wireless Internet access points allow people to connect wirelessly to the Internet from home, work, school, and in many public locationsPages 464 – 465 Discovering Computers 2012: Chapter 9 9Figure 9-4
  • 10. Uses of Computer Communications• A cybercafé is a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customersPage 466 Discovering Computers 2012: Chapter 9 10Figure 9-5
  • 11. 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: Built into Available as a Available with many mobile handheld new vehicles devices devicePage 466 Discovering Computers 2012: Chapter 9 11
  • 12. Uses of Computer CommunicationsPage 467 Discovering Computers 2012: Chapter 9 12Figure 9-6
  • 13. Uses of Computer Communications Groupware Voice mail• Helps groups of people work • Allows someone to leave a together on projects and voice message for one or share information over a more people network • Computer in voice mail• Component of workgroup system converts an analog computing voice message into digital• Major feature is group form scheduling • A voice mailbox is a storage location on a hard disk in the voice mail systemPage 467 Discovering Computers 2012: Chapter 9 13
  • 14. Uses of Computer Communications• Many programs provide a means to collaborate, or work online, with other users connected to a server• Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users Document Online Web management meetings conferences systemsPage 468 Discovering Computers 2012: Chapter 9 14
  • 15. Uses of Computer CommunicationsPage 468 Discovering Computers 2012: Chapter 9 15Figure 9-7
  • 16. 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 sourcesPage 469 16Figure 9-8 Discovering Computers 2012: Chapter 9
  • 17. Networks• A network is a collection of computers and devices connected together via communications devices and transmission media• Advantages of a network include: Facilitating Sharing Sharing data communications hardware and information Sharing Transferring software fundsPages 470 - 471 Discovering Computers 2012: Chapter 9 17
  • 18. NetworksPage 470 Discovering Computers 2012: Chapter 9 18Figure 9-9
  • 19. 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 wiresPage 472 19Figures 9-10 – 9-11 Discovering Computers 2012: Chapter 9
  • 20. 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 areaPage 473 Discovering Computers 2012: Chapter 9 20Figure 9-12
  • 21. Networks• The design of computers, devices, and media on a network is sometimes called the network architecture Client/server network Peer-to-peer networkPages 473 – 474 Discovering Computers 2012: Chapter 9 21Figures 9-13 – 9-14
  • 22. Networks• P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the InternetPage 475 Discovering Computers 2012: Chapter 9 22Figure 9-15
  • 23. Networks• A network topology refers to the layout of the computers and devices in a communications network Star network Bus network Ring networkPages 475 – 477 Discovering Computers 2012: Chapter 9 23Figures 9-16 – 9-18
  • 24. Networks An intranet is an An extranet allows internal network customers or that uses Internet suppliers to access technologies part of its intranetPage 477 Discovering Computers 2012: Chapter 9 24
  • 25. Network Communications Standards Token Ethernet TCP/IP Wi-Fi ringBluetooth UWB IrDA RFID WiMAX WAPPage 477 Discovering Computers 2012: Chapter 9 25
  • 26. Network Communications StandardsEthernet is a network standard that specifies no computercontrols when data can be transmittedThe token ring standard specifies that computers anddevices on the network share or pass a special signal (token)TCP/IP is a network standard that defines how messages arerouted from one end of a network to anotherPage 478 Discovering Computers 2012: Chapter 9 26
  • 27. Network Communications StandardsPage 479 Discovering Computers 2012: Chapter 9 27Figure 9-19
  • 28. Network Communications Standards • Wi-Fi identifies any network based on the 802.11 standard that facilitates wireless communication • Sometimes referred to as wireless EthernetPage 479 28 Discovering Computers 2012: Chapter 9Figure 9-20
  • 29. 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• RFID uses radio signals to communicate with a tag placed in or attached to an object, animal, or personPages 480 - 481 Discovering Computers 2012: Chapter 9 29
  • 30. Network Communications StandardsPage 481 Discovering Computers 2012: Chapter 9 30Figure 9-21
  • 31. Network Communications Standards Wireless Application WiMAX (802.16) Protocol (WAP)• Developed by IEEE • Specifies how some mobile• Towers can cover a 30-mile devices can display the radius content of Internet services• Two types are fixed • Web wireless and mobile • E-mail wireless • Chat rooms• Provides wireless • Uses a client/server broadband Internet access networkPage 482 Discovering Computers 2012: Chapter 9 31
  • 32. Communications Software• Communications software consists of programs that: Help users establish Manage the a connection to transmission of another computer data, instructions, or network and information Provide an interface for users to communicate with one anotherPage 482 Discovering Computers 2012: Chapter 9 32
  • 33. Communications Overthe Telephone Network• The public switched telephone network (PSTN) is the worldwide telephone systemPages 482 – 483 Discovering Computers 2012: Chapter 9 33Figure 9-23
  • 34. Communications Overthe Telephone Network Dial-up Dedicated ISDN line lines line T-carrier DSL FTTP line ATMPages 483 - 485 Discovering Computers 2012: Chapter 9 34
  • 35. Communications Overthe Telephone NetworkPage 483 Discovering Computers 2012: Chapter 9 35Figure 9-24
  • 36. Communications Overthe Telephone Network• ADSL connections transmit data downstream at a much faster rate than upstreamPage 484 Discovering Computers 2012: Chapter 9 36Figure 9-25
  • 37. Communications Devices• A communications device is 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 digitalPage 485 Discovering Computers 2012: Chapter 9 37
  • 38. Communications Devices• A digital modem sends and receives data and information to and from a digital line DSL Cable modem modemPage 486 Discovering Computers 2012: Chapter 9 38
  • 39. Communications DevicesPage 486 39 Discovering Computers 2012: Chapter 9Figures 9-26 – 9-27
  • 40. Communications Devices• A wireless modem uses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile devicePage 487 Discovering Computers 2012: Chapter 9 40Figure 9-28
  • 41. Communications Devices • A network card enables a computer or device to access a network • Available in a variety of styles • Wireless network cards often have an antennaPage 487 41 Discovering Computers 2012: Chapter 9Figure 9-29
  • 42. 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 networkPage 487 Discovering Computers 2012: Chapter 9 42Figure 9-30
  • 43. Communications Devices • 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 firewallPage 488 43 Discovering Computers 2012: Chapter 9Figure 9-31
  • 44. Communications Devices• A hub or switch connects several devices in a network togetherPages 488 – 489 Discovering Computers 2012: Chapter 9 44Figure 9-32
  • 45. Home Networks• Home networks provide computers with the following capabilities: Connect to the Share a single high- Access files and Internet at the speed Internet programs on other Share peripherals same time connection computers Connect game Play multiplayer Subscribe to and consoles to the games use VoIP InternetPage 489 Discovering Computers 2012: Chapter 9 45
  • 46. Home Networks• Types of wired home networks: Ethernet Powerline cable PhonelinePage 489 Discovering Computers 2012: Chapter 9 46
  • 47. Home NetworksPage 490 Discovering Computers 2012: Chapter 9 47Figure 9-33
  • 48. Communications Channel • The amount of data that can travel over a communications channel sometimes is called the bandwidth • Latency is the time it takes a signal to travel from one location to another on a network • Transmission media carries one or more signals • Broadband media transmit multiple signals simultaneouslyPage 491 48 Discovering Computers 2012: Chapter 9Figure 9-34
  • 49. Physical Transmission MediaPage 492 Discovering Computers 2012: Chapter 9 49Figure 9-35
  • 50. Physical Transmission Media Twisted-pair cable Fiber-optic cable Coaxial cablePage 493 Discovering Computers 2012: Chapter 9 50Figures 9-36 – 9-38
  • 51. Wireless Transmission MediaPage 494 Discovering Computers 2012: Chapter 9 51Figure 9-39
  • 52. Wireless Transmission Media• Cellular radio is a form of broadcast radio that is used widely for mobile communicationsPages 494 - 495 Discovering Computers 2012: Chapter 9 52Figure 9-40
  • 53. Wireless Transmission Media• Microwaves are radio waves that provide a high- speed signal transmissionPage 496 Discovering Computers 2012: Chapter 9 53Figure 9-41
  • 54. Wireless Transmission Media • A communications satellite is a space station that receives microwave signals from an earth-based station, amplifies it, and broadcasts the signal over a wide areaPage 496 54 Discovering Computers 2012: Chapter 9Figure 9-42
  • 55. Video: Got Your Video Right Here CLICK TO START Discovering Computers 2012: Chapter 9 55
  • 56. Summary Overview of How to join communications computers into a terminology and network applications Various communications devices, media, and proceduresPage 497 Discovering Computers 2012: Chapter 9 56
  • 57. Chapter 9Networks and CommunicationsDiscovering Computers 2012 Your Interactive Guide to the Digital World Chapter 9 Complete