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NETWORKS AND COMMUNICATIONS

Chapter Four. NETWORKS AND COMMUNICATIONS. Communications. Computer communication describes a process in which two or more computers or devices transfer data, instructions, and information. Communications. Uses of Computer Communications. Uses of Computer Communications.

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NETWORKS AND COMMUNICATIONS

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  1. Chapter Four NETWORKS AND COMMUNICATIONS

  2. Communications • Computer communicationdescribes a process in which two or more computers or devices transfer data, instructions, and information

  3. Communications

  4. Uses of Computer Communications

  5. Uses of Computer Communications

  6. Uses of Computer Communications • Wireless Internet access pointsallow people to connect wirelessly to the Internet from home, work, school, and in many public locations

  7. 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:

  8. Uses of Computer Communications

  9. Uses of Computer Communications

  10. 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

  11. Networks • A network is a collection of computers and devices connected together via communications devices and transmission media • Advantages of a network include:

  12. Networks

  13. 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

  14. 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

  15. Networks • The design of computers, devices, and media on a network is sometimes called the network architecture Client/server network Peer-to-peer network

  16. Networks • A network topologyrefers to the layout of the computers and devices in a communications network Bus network

  17. Networks Star network Ring network

  18. Communications Software • Communications softwareconsists of programs that:

  19. 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

  20. 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

  21. Physical Transmission Media Twisted-pair cable Fiber-optic cable Coaxial cable

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