课程论文
Computer network
姓 名:
学 春夏秋冬教学反思号:
学 校:
指导教师:
完成日期:
Computer network
abcc词语Abstract：This article from the development of the network history, basic theory, performance, scale, the importance of network curity, it puts forward some opinions, and illustrated, make the majority of Internet urs to computer networks have a comprehensive understanding of the.
椿萱是什么意思Key word: computer network communication performance TCP/IP LAN WAN MAN PAN
Introduction: 忘记歌词Today, computer networks are the core of modern communication. All modern aspects of the public switched telephone network are computer-controlled, and telephony increasingly runs over the Internet Protocol, although not necessarily the public Internet. With the popularization of computer network and application, network brings people convenient, became people necessities of life.
The computer network development history
Before the advent of computer networks that were bad upon some type of telecomm
unications system, communication between calculation machines and early computers was performed by human urs by carrying instructions between them. Many of the social behaviors en in today's Internet were demonstrably prent in the 19th century and arguably in even earlier networks using visual signals.
In 1946 the world the first electronic computer came into being after ten years of time, becau the price is expensive, computer quantity is few. People will be a computer communication lines and through a number of terminal connected directly, this kind of means can as the most simple LAN prototypes.
The earliest network, is by the us defen advanced rearch projects agency (ARPA) built. Many of the modern computer network concepts and methods, such as packet switching technology comes from the ARPAnet. The ARPAnet rent the packet switching line Internet rearch, and do the radio, satellite network packet switching technology rearch and the results led to TCP/IP market.
1977-1979, ARPAnet launched at prent forms of TCP/IP system structure and agree
ment. In 1980, ARPA To establish the ARPAnet for backbone in the early years of the Internet. In 1983, all the computer to complete the ARPAnet to TCP/IP conversion, realize the TCP/IP. In 1984, the national science foundation planning established the 13 countries computing center and national education super science and technology network. Then replace the backbone of the ARPANET status. In 1988, Internet began to open. From then on Internet growth speed uncontrollable.
The computer network performance王粲七哀诗
孩子高烧怎么办Facilitate communications
Using a network, people can communicate efficiently and easily via email, instant messaging, chat rooms, telephone, video telephone calls, and video conferencing.
五子棋技巧
Permit sharing of files, data, and other information
In a network environment, authorized urs may access data and information stored on other computers on the network. The capability of providing access to data and informatio
n on shared storage devices is an important feature of many networks.
Share network and computing resources
In a networked environment, each computer on a network may access and u resources provided by devices on the network, such as printing a document on a shared network printer. Distributed computing us computing resources across a network to accomplish tasks.
May be incure
A computer network may be ud by computer hackers to deploy computer virus or computer worms on devices connected to the network, or to prevent the devices from normally accessing the network (denial of rvice).
May be difficult to t up
A complex computer network may be difficult to t up. It may also be very costly to t up an effective computer network in a large organization or company.
The scale of the computer network
怎么更改文件类型Networks are often classified by their physical or organizational extent or their purpo. Usage, trust level, and access rights differ between the types of networks.
Personal area network (PAN)
A personal area network is a computer network ud for communication among computer and different information technological devices clo to one person. Some examples of devices that are ud in a PAN are personal computers, printers, fax machines, telephones, PDAs, scanners, and even video game consoles. A PAN may include wired and wireless devices. The reach of a PAN typically extends to 10 meters. A wired PAN is usually constructed with USB and Firewire connections while technologies such as Bluetooth and infrared communication typically form a wireless PAN.
Local area network (LAN)
