计算机办公网络安全初探

本文主要从计算机办公局域网络安全以及计算机办公终端安全管理模式两个方向探讨了计算机办公网络安全问题.     

局域网系统环境分析及其在MIS中的应用

计算机网络是现代ＭＩＳ的基础和结构的主体，本文在介绍现代ＭＩＳ概念的基础上，重点论述ＭＩＳ中常用的微机局域网络系统环境及特点，并结合一个实例（长沙汽车制造总厂）介绍ＭＩＳ的开发与应用，以供参考。     

无线局域网及其发展前景

1.无线局域网络发展背景 目前大多数局部网络都采用有线方式连接以实现数据的传输。有线连接受到布线有效距离及布线环境等条件的制约,影响或限制了某些场合的应用。鉴于以上原因,近些年来,国内外网络通信厂商先后成功发展了多种无线网络通信产品,彻底弥补了有线网络的上述限制,丰富了计算机网络的内涵,     

解决IP地址冲突的问题

在一些局域网络中，由于每台计算机的IP地址都是固定的，所以当某台计算机的IP地址被占用之后，不但无法访问互联网，而且还会经常出现“IP地址冲突”的提示。如何找出IP地址配置错误的计算机始终是困扰网络管理员的一大难题，下面我就将工作中的一些心得和大家分享。     

计算机局域网络中不同传输介质的性能及优劣

对计算机局域网络的重要组成部分─—传输介质在局域网络中的作用、性能等方面进行了较详细的分析；从传输介质的物理特性、传输特性、最适用的链接方式、传输距离与范围、抗噪声性及在局域网络中的相对价格等多方面总结出不同传输介质在网络中的优劣，给将要建网的用户提供参考。     

局域网设计预测

论述对先进结构模型ＣＳＭＡ局域网设计实现预测的方法，讨论了ＣＳＭＡ型局域网结构模型，并给出了吞吐量和局域网络效率的计算值，文末用５个程序的模块流程图说明模拟ＣＳＭＡ局域网的算法。     

计算机专用PDP柜的设计与研制

主要论述了计算机专用配电柜ＰＤＰ（ＰｅｗｅｒＤｉｓｔｒｉｂｕｔｉｏｕＰａｎｅｌ）柜的设计与研制，介绍了ＰＤＰ—４００型配电柜的特点及用途．     

分布式工业控制计算机局域网的研究与实现

本文研究了一种分级分布式工业控制计算机局域网，提出了标准转换器．实现了硬件联网；根据国际标准制定了此网的通信协议，设计了所有通讯软件，实现了软件联网，成功地完成了一台IBM-PC386与三台STDBUS工业控制机的联网，构成了实时性好，可靠性高，价格较低的二级分布式工业控制计算机局域网络，此网不仅适用于化工生产，而且也适用其它生产过程控制，具有广泛的推广价值。     

基于微机局域网络上的CAD/CAE/CAM

本文介绍了微机局域网络硬、软件的种类及组成特点和共享数据库的实现，并说明了微机局域网络（WindowsNT网络）是实现CAD／CAE／CAM系统一体化最佳性能价格比的方法。     

微型计算机局域网络的规划途径及技术

本文详述了微型计算机局域网络的规划途径及技术，主要探讨了网络操作系统、服务器及网络接口卡的配置技术，这对正确规划微机网络和提高网络性能价格比具有一定的参考价值。     

Microcomputers and distributed systems

The combination of local area networks and microcomputers has led to increased interest in distributed systems architecture. The advent of wide area networks has brought about many studies into distributed databases, large computers and distributed resources. The paper discusses the evolution of distributed systems, the driving forces at work in the market and the consequences of advances in the technology. It then describes the experience of and the design approach taken by a manufacturer of distributed systems. Desirable features of a ‘full capability’ network are also presented.     

Experience with remote procedure calls in a real-time control system

This paper describes several years' practical experience with remote procedure calls as a primary tool for application software in a large and complex distributed real-time process control system. We motivate the use of remote procedure calls as an effective technique for the use of local area networks, describe our implementation and discuss its advantages and disadvantages.     

A gateway development system

There are an increasing number of local area networks being developed and built for use in a wide range of environments. The underlying communication architecture in the majority of cases is either a broadcasting or ring system. This paper describes a gateway development system which is specifically designed to deal with the interconnection of broadcast and ring systems. The gateway makes use of recently developed microprocessor chips to handle the different requirements of the two networks being connected. In particular, the gateway will be used to link an Ethernet-like system and a Cambridge Ring.     

Metropolitan Ethernet Network: A move from LAN to MAN

Ethernet has been the indisputable technology of choice for the local area networks (LANs) for more than 30 years. Its popularity is due to its versatility, plug-n-play feature, and low cost. It has transformed from a CSMA/CD technology providing low throughput to a full-duplex link increasing the throughput 1000-folds. Despite these improvements, Ethernet is still restricted to local area networks, and is not ready to become a carrier-grade technology for wider areas. However, there are efforts to assist the transformation of Ethernet from the mainstream LAN technology to the possible adoption for metropolitan area networks (MENs). This paper will introduce the movement from basic Ethernet to the carrier grade Ethernet for MENs. The paper describes the underlying technology, offered services, the state-of-the-art, and the comparison between various technologies. In the context of the move from LAN to MAN, various problems and their corresponding solutions are discussed, along with the future of Metro Ethernet Network.     

无线网络的安全通信协议问题浅析

探讨了无线网络的安全通信协议中的无线系统的安全性能、无线应用协议和无线局域网的安全,重点分析了无线局域网安全问题.     

Toward pervasive computing

Summary form only given. The fundamental principles that guide pervasive computing environment design evolved with distributed systems: local area networks, middleware, wide-area networks, the WWW. Over the years, ever smaller, portable computers came on the market and wireless networking technology evolved, leading to the emergence of mobile and wireless computing. Embedded computing gave us small devices, sensors and actuators, increasingly with communications capability. There are now substantial projects that demonstrate that sensor-rich environments, such as active buildings and cities, are feasible and will be deployed widely in the real world in the near future. This issue of Pervasive Computing describes several such projects.     

Roaming across wireless local area networks using SIM-based authentication protocol

Wireless local area networks provide high speed data transferring rate to a mobile device. And it is crucial to integrate together two critical issues, the authentication and roaming in heterogeneous networks. For this, Tsai and Chang proposed a SIM-based authentication mechanism for wireless local area networks in 2006. Tsai and Chang's scheme provides an integration method of mobile cellular networks and wireless local area networks. Unfortunately, we found that there are some weaknesses existing in their scheme. In this paper, we propose an improved version for a user roaming in heterogeneous networks. Besides, we also proposed a mobile IP model to provide a better efficiency for a mobile user in WLAN environment.     

试谈无线网络通信技术及其应用

从无线个域网、无线局域网、无线城域网和无线广域网这4种无线网络通信技术入手,从技术角度对比了它们的优劣势及应用的范围。     

Implementation of a dynamic address assignment protocol in a local area network

This paper describes the implementation of a dynamic address assignment protocol (DAAP) on a prototype local area network. A DAAP permits the use of shorter addresses on each packet, which can lead to reduced overhead on networks that support short packets. The protocol described can be applied to any network which permits one station to be distinguished from a set of several stations using the same address. In a network using dynamic addresses a station may arbitrarily use a wrong address; the ensuing problems are discussed.     

Experimenting with local networks using an integrated circuit data link controller

There has been considerable discussion recently about the implementation of local networks. Much of this discussion centres around techniques requiring special hardware which is often too expensive for the application or not yet available. There is, however, an immediate need for local networks of a more modest price and performance. This paper describes the use of an integrated circuit data link controller to implement an inexpensive low performance local network.