problems that cannot be ignored. Some leaders unwilling to do masses work, masses concept weak, on masses feelings not deep, pendulum not are with masses of relationship, think masses work is revolutionary war era of things, now obsolete has, buried business work, ignored masses work of situation compared General; some leaders not do masses work, old method regardless of with, new not with, not understand masses psychological, not understand masses wishes, not said masses language, work method simple stiff, caused masses of conflict and antipathy; some leaders can't do masses work, Faced with a lot of contradictions among the people worry about fear, panic set in encounter group events, and some are even mismanaged, inflame, so work has suffered heavy losses, and so on. These problems we are soberly aware, enhancing the party's ruling capability, the maintenance and development of the party's advanced nature and purity, and to enhance the ability of partcommittees and leading cadres are good people. Attach great importance to and is good at doing mass work, has become the new urgent situation strengthening the party's governing capacity-building tasks. Combined practice of maintaining flesh-and-blood ties with the masses, urged the broad masses of party members and cadres, especially all levels ... Processing to improve as a guide to the country. \d is summed up these new things, be promoted. \d manifestation of the Deng Xiaoping's mass. Deng also put people \happy\omise\point and destination of developing guidelines, policies, and as the only standard for measuring compliance with the wishes of the masses of the people. Under the guidance of Deng Xiaoping theory, Central Government adopted a series of important measures to strengthen links with the masses. In December 1989, the CPC Central Committemade on adhering to and perfecting the system of multi-party cooperation and political consultation under the leadership of the Chinese Communist Party, closely for CPC and the democratic parties and the relationship between the part of the masses that they contact, effectively carrying out the mass line, played a positive role. In March 1990, the 13 plenary session adopted the decision on strengthening contacts with the masses of the Party noted that \nd developed in the long struggle of the party's mass line, is to realize the party's ideological line, the fundamental political and organizational work route\can always maintain flesh-and-blood ties and development of the masses, is directly related to the rise and fall of the rise and fall of the party and State. In September 1994, 14 adopted by the plenary session of the Party on strengthening decision on several major issues of party building. The requirements of the decision of the party's leading bodies and leading cadres should develop a democratic style of work, come from the masses, to the masses, together, stick to the mass line. Party of 13 session four in the plenary yihou, to Jiang comrade for core of party计算机网络的发展简史
? 计算机网络的产生和发展经历了从简单到复杂、从单机系统到多机系统的发展过程，
其演变过程可分为三个阶段：
– 以单计算机为中心的联机系统； – 计算机—计算机网络； – 网络体系结构标准化。
1、以单计算机为中心的联机系统 20世纪60年代以前
– 用户可在远距离的终端（Terminal）上输入自己的程序和数据，由主机进行
处理后再由通信线路将结果返回给用户终端。这种系统也称为终端—计算机网络，是早期计算机网络的主要形式。
– 缺点：
– 主机负荷较重，效率较低; – 通信线路的利用率低;
– 集中控制方式，可靠性低。
– 为了尽量克服以上的缺点，当时人们又开发了一些提高使用效率的技术，对后来网
络技术的发展具有很大的启发作用。
– 多点通信线路
– 终端集中器和前端处理机
2、计算机—计算机网络
从20世纪60年代中期到70年代中期
– 第一种形式是通过通信线路将主计算机连接起来，主机既承担数据处理，又
承担通信工作.
of third generation Central led collective, banner Deng Xiao-ping's theory great flag, insisted liberation thought, and facts, and times, in both at home and abroad political storm, and economic risk, severe test before, relies on party and people, defended China features Socialist, created socialist market new system, created full open new situation, advance party of construction new of great engineering, founded \e a representative\nt thought, Continue to steer the ship of reform and opening up forward on the right. Comrade Jiang Zemin said: \ngthening and improving the party's mass work in the new situation, it is of decisive significance to consolidating the ruling Foundation of the party. \ough our party and some of the world's major lessons learned from the success of the old party of the party, Comrade Jiang Zemin pointed out:\biggest political advantage of our party is in close contact with the masses, the most dangerous after the ruling party was divorced from the masses. \d:\construction, only the understanding, support and participation of the people, people's enthusiasm and creativity into full play in order to advance; the leadership of the party, only the tie and win the masses embraced, can be consolidated and strengthened. \out that strengthening and improving the party's work style construction, maintaining the party's flesh-and-blood ties with the masses is the core problem, the key is to do solid work, implement, resolutely oppose and overcome formalism. Comrade Jiang Zemin stressed that all the work and policies of the party, are in compliance with the fundamental interests of the overwhelming majority of the people to the highest degree, to the majority of people are not satisfied with the fundamental guidelines, strive to make our workers, farmers, intellectuals and other people enjoy ... Single, everyone seemed to know. But well known does not mean perfect. Some party members and leadingcadres, consider contacting their small departments, within a small circle of people, or contact individual owners, the entrepreneur, is the masses, this idea is obviously not correct. The Communist Party of China, people should have three characteristics. First, the people should be the most social, is a Department within the scope of the majority. Specific to the party and Government departments, especially the cadres working in the Central and State organs, mass is the 1.3 billion Chinese people, work for the party members and cadres, masses are the land within the jurisdiction of the common people. The second characteristic of the masses, is that we have common interests. Masses are manifestations of each specific people, but the crowd is a comprehensive political concept, refers to people with common political and economic interests in the period of social transformation, social differentiation between the interests of the masses is large, if you do not find the interest in doing mass work, the party members and cadres, will be in a passive position. The third characteristic of the massesproblems that cannot be ignored. Some leaders unwilling to do masses work, masses concept weak, on masses feelings not deep, pendulum not are with masses of relationship, think masses work is revolutionary war era of things, now obsolete has, buried business work, ignored masses work of situation compared General; some leaders not do masses work, old method regardless of with, new not with, not understand masses psychological, not understand masses wishes, not said masses language, work method simple stiff, caused masses of conflict and antipathy; some leaders can't do masses work, Faced with a lot of contradictions among the people worry about fear, panic set in encounter group events, and some are even mismanaged, inflame, so work has suffered heavy losses, and so on. These problems we are soberly aware, enhancing the party's ruling capability, the maintenance and development of the party's advanced nature and purity, and to enhance the ability of partcommittees and leading cadres are good people. Attach great importance to and is good at doing mass work, has become the new urgent situation strengthening the party's governing capacity-building tasks. Combined practice of maintaining flesh-and-blood ties with the masses, urged the broad masses of party members and cadres, especially all levels ... Processing to improve as a guide to the country. \d is summed up these new things, be promoted. \d manifestation of the Deng Xiaoping's mass. Deng also put people \happy\omise\point and destination of developing guidelines, policies, and as the only standard for measuring compliance with the wishes of the masses of the people. Under the guidance of Deng Xiaoping theory, Central Government adopted a series of important measures to strengthen links with the masses. In December 1989, the CPC Central Committemade on adhering to and perfecting the system of multi-party cooperation and political consultation under the leadership of the Chinese Communist Party, closely for CPC and the democratic parties and the relationship between the part of the masses that they contact, effectively carrying out the mass line, played a positive role. In March 1990, the 13 plenary session adopted the decision on strengthening contacts with the masses of the Party noted that \nd developed in the long struggle of the party's mass line, is to realize the party's ideological line, the fundamental political and organizational work route\can always maintain flesh-and-blood ties and development of the masses, is directly related to the rise and fall of the rise and fall of the party and State. In September 1994, 14 adopted by the plenary session of the Party on strengthening decision on several major issues of party building. The requirements of the decision of the party's leading bodies and leading cadres should develop a democratic style of work, come from the masses, to the masses, together, stick to the mass line. Party of 13 session four in the plenary yihou, to Jiang comrade for core of party第二种形式是把通信从主机分离出来，设置通信控制处理机CCP（Communication Control Processor）主机间的通信通过的中继功能间接进行。由CCP组成的传输网络称通信子网。
基于计算能力（硬件）共享的第一代计算机网络 （联机系统发展的三个重要阶段） 联机系统第一阶段
? 独立线路控制器 ? 独立连接线路 联机系统第二阶段
? 多重线路控制器
? 利用公网专线连接线路 联机系统第三阶段
? 数据处理与通信控制分工 ? 数据处理与数据通信分工
基于数据、软件和外设共享的第二代计算机网络 （局域网LAN发展的三个重要阶段） 阶段1：碰撞由网桥缓解 阶段2：碰撞由HUB控制 阶段3：多通道交换无碰撞
基于数据通信和协同工作的第三代计算机网络 （广域网WAN发展的三个重要阶段） 阶段1：数据分组网
阶段2：基于公用网的Internet
阶段3：基于光连接的宽带Internet
of third generation Central led collective, banner Deng Xiao-ping's theory great flag, insisted liberation thought, and facts, and times, in both at home and abroad political storm, and economic risk, severe test before, relies on party and people, defended China features Socialist, created socialist market new system, created full open new situation, advance party of construction new of great engineering, founded \e a representative\nt thought, Continue to steer the ship of reform and opening up forward on the right. Comrade Jiang Zemin said: \ngthening and improving the party's mass work in the new situation, it is of decisive significance to consolidating the ruling Foundation of the party. \ough our party and some of the world's major lessons learned from the success of the old party of the party, Comrade Jiang Zemin pointed out:\biggest political advantage of our party is in close contact with the masses, the most dangerous after the ruling party was divorced from the masses. \d:\construction, only the understanding, support and participation of the people, people's enthusiasm and creativity into full play in order to advance; the leadership of the party, only the tie and win the masses embraced, can be consolidated and strengthened. \out that strengthening and improving the party's work style construction, maintaining the party's flesh-and-blood ties with the masses is the core problem, the key is to do solid work, implement, resolutely oppose and overcome formalism. Comrade Jiang Zemin stressed that all the work and policies of the party, are in compliance with the fundamental interests of the overwhelming majority of the people to the highest degree, to the majority of people are not satisfied with the fundamental guidelines, strive to make our workers, farmers, intellectuals and other people enjoy ... Single, everyone seemed to know. But well known does not mean perfect. Some party members and leadingcadres, consider contacting their small departments, within a small circle of people, or contact individual owners, the entrepreneur, is the masses, this idea is obviously not correct. The Communist Party of China, people should have three characteristics. First, the people should be the most social, is a Department within the scope of the majority. Specific to the party and Government departments, especially the cadres working in the Central and State organs, mass is the 1.3 billion Chinese people, work for the party members and cadres, masses are the land within the jurisdiction of the common people. The second characteristic of the masses, is that we have common interests. Masses are manifestations of each specific people, but the crowd is a comprehensive political concept, refers to people with common political and economic interests in the period of social transformation, social differentiation between the interests of the masses is large, if you do not find the interest in doing mass work, the party members and cadres, will be in a passive position. The third characteristic of the masses
计算机网络的发展简史
