The most prominent feature of computer networks is resource sharing. Resource sharing is one of the main purposes for people to establish computer networks. Usually, the resources required by multiple users at the same time always exceed the number of actual physical resources of the system. However, using logical (or virtual) resource allocation to realize resource sharing can better handle this contradiction and improve the efficiency of computer use.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
Computer network refers to the connection of multiple computers and their external devices with independent functions in different geographical locations through communication lines. Under the management and coordination of network operating systems, network management software and network communication protocols , a computer system that realizes resource sharing and information transfer.
The most prominent feature of computer networks is resource sharing.
"Resources" refers to all software, hardware and data resources in the network.
"Sharing" means that users on the network can enjoy these resources in part or in full.
"Resource sharing" means that multiple users share hardware and software resources in the computer system. In the network system, the main resources that end users can share include processor time, shared space, various soft equipment and data resources, etc. Resource sharing is one of the main goals achieved by computer networks.
Two basic principles of resource sharing:
1. The law of large numbers:
The law of large numbers says: : If the number of users is large, and their resource usage requirements are sudden and random, then when all users are considered as a whole, the user's overall resource usage requirements will become quite smooth and stable. And it's also predictable.
2. Economies of scale
Economies of scale say: when the resources and the number of users in a system increase in proportion at the same time, within a certain range, The larger the size of the system, the more economical the system is.
Advantages of resource sharing:
Computer resources include hardware resources, software resources, data resources and communication channels.
Sharing of hardware resources can improve equipment utilization and avoid repeated investment in equipment, such as using computer networks to establish network printers;
Software The sharing of resources and data resources can make full use of existing information resources, reduce labor in the software development process, and avoid repeated construction of large databases.
The sharing of communication channel resources means that the same channel can be used by multiple users at the same time.
In actual work, it is often encountered that multiple users (computers or terminals) want to connect to a host at the same time. If each user uses an independent channel to connect to the host, it often consumes a lot of communication line resources. Therefore, channel sharing should be used whenever possible. Channel sharing can improve the utilization of channel resources.
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