Classification of computer networks

下面为大家整理一篇优秀的paper代写范文- Classification of computer networks，供大家参考学习，这篇论文讨论了计算机网络的分类。按照计算机网络可覆盖的区域范围来划分，计算机网络可分为局域网、城域网和广域网。局域网的范围大小是三者中最小的，它的工作原理是在一个较小的场地中，以多台计算机捆绑起来组合成一台，以便更加有效地实现多个不同资源的共享。而城域网比局域网的范围要大一些，但它们的工作原理是相似的，不过城域网的功能性比较多样化。广域网，指的是跨域很大的一个网络范围。互联网就是最大的广域网。它的操作系统和机器设备自然也是三者中要求最高的。广域网可以包括大大小小的子网，而这些子网既可以是局域网，也可以是城域网。

In today's increasingly developed society, the computer has developed very rapidly. Whether a child in kindergarten or an old retired person, he or she knows nothing about computers. Since computer plays such an important role in human life, it is particularly important to discuss the composition of computer network technology and its application in practice. This article will share with you how the computer came into being, the development from the past to the present, the classification system of computer network, and its application in real life. Finally we will make a summary of the development of computer network.

To promote the development of computer network technology is the trend of The Times, and to promote the development of network technology, the most important thing is to deal with network access terminals and nodes. Dealing with these two aspects is the root cause of promoting the development of network technology. In addition, the computer network has three parts, they are LAN, inter-city network and wan. All three different networks have their own standards. In order for Internet technologies to be more mature and convenient for people, we need to update and improve their standards. Today's web technologies in our country place great emphasis on layered design, that is, each layer has its own responsible content. We will discuss all of these in this article.

We all know that computer is the carrier of computer network. ENIAC, the name of the first computer in human history, was invented during world war ii. Because of this particular historical period, it was born in order to be able to apply to the military, to calculate information about artillery shells. However, this first computer not only has a huge mass, but also occupies a large area. What's more inconvenient is that once it is started, the power in a large area around it will be affected, and there may even be a large-scale blackout. So even though it's not too fast, it's still banned after nine years. However, its advent is of great significance to human history and can be said to be the prelude of a new era. Since then, more and more convenient computers have been improved by it.

The principle of the first computer network was that it had a special controller which could be connected to many interfaces. This constitutes a point - to - surface divergent system. But it is the nature of this network connection that causes the system to run at a high load and, when it is operating for long periods of time, can cause the system to crash. Later, with the efforts of scholars, people introduced the technical support of multiple computers working together. Thus the second generation of computer networks appeared. Instead of focusing on one point, as in the first generation of networks, it will focus on a communication subnet, where both the host and the link can act as the transmission role. This greatly lightens the load on the computer.

According to the computer network can cover the area, the computer network can be divided into three categories, respectively: LAN, man and wan.

The LAN is the smallest of the three. It can be in a room, a company, a school, etc. It measures the distance to within a few kilometres. And it works by bundling together multiple computers in a smaller site to make sharing of different resources more efficient. This determines that LAN has certain limitations. In order to overcome this limitation, LAN can often use the following three methods: network topology technology, transmission media, and media control method. Network topology consists of bus type, ring type and star type. Bus type has the characteristics of convenient introduction and easy operation, etc., the transmission and reception of information are completed by only one line, and all connection points and total data lines are connected by only one point. Therefore, the sharing of information in the topology is completed by only two points. Although topology technology is easy to operate, it has the disadvantage of making the utilization of network communication lower. Ring topology, instead of point-to-point connections like topology, forms a circular system that allows managers to work more easily, but if there are too many closed links, the rate of information transmission will be greatly reduced. Star topology technology is like a big tree because its points and central collection lines are good like the trunk and branches of a tree. Star topology is the most convenient and feasible of the three network topologies.

Metropolitan area networks are larger than lans, but they work similarly. Because the man structure is relatively simple, no switching equipment, only one or two cables. But it's more versatile. It can cover either a city or office buildings not far from each other. It can be used on private networks or public networks; Can carry on the data transmission such as voice, also can connect with the media such as TV.

Wan refers to a wide range of networks across a wide area, as large as an entire country can be. The Internet is the largest wan. Its operating system and machinery are naturally the most demanding of the three. The host that we often use in our life, it is the machine set that wide area network USES to run our application; The communication subnet connects these hosts of the user to work together. Wans can include subnets large and small, and these subnets can be either local or metropolitan.

Computer network technology can be found in almost every new or old field: corporate systems, education management, e-commerce, medical systems and other industries are widely used. And in some high-rise building applications can be said to be the use of computer network technology incisively and vividly, these high-rise buildings are also known as "intelligent building". Suppose a "smart building" has dozens of floors, each with several office areas, and each with a different network. At this time, the building USES the network topology we mentioned above to connect the work affairs managed by each layer together, forming a large and simple management system. Computer network technology can also be used to build a public platform that is convenient for resource sharing. On this platform, people can upload their own information, realize the continuous update of information resources, and make the information searched more timely. Not only that, network technology can improve the security of information. Because the network technology not only can carry on the encryption processing to the information, but also can add the alarm device. Whether for enterprises or individuals, this function of computer network technology can bring great convenience. Using computer network services can not only break the geographical limitations, but also allow people to transfer information regardless of time limit. Users use network technology to set the time for the information to be sent to the receiving end, which inevitably brings convenience to many users.

As can be seen from the above article, the development of computer network technology is closely related to the progress of society. Network technology can provide security for important information of a country, greatly simplify the operation and management system of a company, and bring great convenience to personal life. Therefore, it is the trend of The Times to cultivate network technical talents and improve computer network technology. We believe that no matter which country masters the advanced network technology, it can stand out in the global competitive environment.

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