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Chapter 9 Outline

Chapter 9 Outline - Chapter 9 Networks Data communication...

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Chapter 9: Networks Data communication – the electronic transfer of information between computers Network – set of technologies-including hardware, software, and media-that can be used to connect computers together, enabling them to communicate, exchange information, and share resources in real time Allow many users to access shared data and programs almost instantly Open up new ways to communicate, such as e-mail Reduce the cost of running an organization Can include all the computers and devices in a department, building, or multiple building spread over a wide geographic area, such as a city or country Internet is the single largest network Uses of a Network Simultaneous access o Times when several workers may need to use the same data at the same time o Network server (server) – storing commonly used data at a central location Central computer with a large storage device and other resources that all users can share o File server – server that stores data files for users to access Business can store a single copy of a date file on the server that employees can access whenever the want If one user makes a change to a file, other users will see the change when they use the file o Site licenses – business buys a single copy of an application and then pays the developer for a license to copy the application onto a specified number of computers Each user has a complete, individual copy of the program running on his PC, but the business pays less than if it purchased a copy for each user o Network versions – only one copy of the application is stored on the server, with a minimum number of supporting files coped to each user’s PC When needed, load it from the server into the RAM of own computer o Application server – handles some application processing as well as storage Handles some or all of the processing tasks Shared peripheral devices o One of the best reasons for small business to set up a network o Less expensive and easier to manage o Print server – computer that manages one or more printers, submit documents across a network to a printer Personal communications
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o Teleconference – any kind of multiway communication carried out in real time using telecommunications or computer networks and equipment Audio and video signals travel across a local area network (LAN) through the use of cables and switches or across the network’s Internet connections to remote sites located throughout the world o Videoconference – enables real-time communication over a distance by allowing people at two or more sites to communicate with each other by seeing a video picture of the people at the other sites o Audio-conference – provides an audio link similar o that of a conventional telephone, except that it offers much higher-quality audio and enables more than two sites to be linked together o Data-conference – enables participants at two or more sites to have a
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Chapter 9 Outline - Chapter 9 Networks Data communication...

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