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Primarily, the thesis assays the condition of network framework, the network was divided into three levels in terms of network management in order to establish the distributed method ,and still pointing out the intention and denotation of studying the Topology Discovery.Next, the thesis analyzes SNMP protocol minutely, including its development, principle, and the Network Management system that established on the SNMP protocol. Have analysed MIB in detail and the application way of MIB in network management .The thesis also assays the ICMP protocol, describing its working principle and the format of datagram minutely , and describing two important tools of ICMP- Ping and TraceRoute in detail. On the base of upper analysis, the thesis expounds a kind of distributed Topology Discovery project, and book it in one autonomy system. Topology Discovery was divided into two levels in terms of network management, and analyses the way of linking up between the two level. The thesis minutely assays Router-Level Topology Discovery technology basing on SNMP and Subnet-Level Topology Discovery technology basing on ARP and ICMP. According to these analyses, the thesis explores the specific methodology and the technology of XML data object which using the WinSNMP API to achieve topology discovering system on the development platform of Visual C++, and also analyses the technology of topology analysis and topology graph minutely. Moreover, the thesis assays the technology of basic firewall and Topology Discovery response strategy. Finally, the thesis analyses the underlying blind problem of the topology finding, and also analyses the reason that the blind problem produced and the way that reduced. The distributed algorithm that this paper puts forward has a certain directive significance in wireless network or other fields.

本文首先分析了网络结构状况，将网络从网络管理的角度划分为三个层次，为分布式的方法奠定了基础，同时还指出拓扑发现研究的目的及意义；接着本文分析了SNMP协议，详细分析了SNMP协议的发展状况，协议的工作原理，以及由SNMP协议基础上建立的SNMP网络管理体系，详细分析了MIB，以及MIB在网络管理上的应用方式；本文又分析了ICMP协议，详细描述了ICMP的工作原理和数据报格式，并详细描述了ICMP的两个重要工具-Ping 和TraceRoute；然后本文在结合上述分析的基础上，提出了一种分布式的拓扑发现方案，将拓扑发现拟订在一个自治系统内，将拓扑发现从网络管理角度划分为路由器级和子网级两个层次，分析了两个层次之间的衔接方式，同时从拓扑地域的角度将拓扑发现过程分布化，分析了分布式算法的具体方法和分布式结点之间的数据通讯方法，本文详细分析了基于SNMP的路由器级拓扑发现技术和基于ARP和ICMP的子网级拓扑发现技术；根据这些分析，本文利用XML数据对象作为分布式算法中的数据对象，分析了XML的技术，本文使用Visual C++开发平台实现网络拓扑发现系统，详细分析了使用WinSNMP API实现基于SNMP的路由器级拓扑发现和基于ARP的子网级拓扑发现，分析了使用Winsock编程实现基于ICMP的子网级拓扑发现，本文还对拓扑分析和拓扑图的绘制技术作了较细致的分析；本文最后还分析了基本防火墙技术，分析了几种类型的防火墙对拓扑发现带来的影响，以及在拓扑发现时的应对策略，本文还分析了拓扑发现中可能产生的盲点问题，分析了盲点产生的原因以及拓扑发现中减少盲点的方法。

The book review first vector and matrix algebra, the basic concepts and then described in detail geometry involved in a variety of two-dimensional graphics and three-dimensional geometric measurement of the object, the intersection of various algorithms and other issues, and provides information on the theme of a large number of computational geometry materials in order to facilitate quick reference.

全书先复习了向量和矩阵代数的基本概念，而后详细地描述了图形几何学涉及的各种二维和三维对象的几何测量、相交等问题的各种算法，并提供了关于计算几何学主题的大量材料以便于快速参考。

Cost price Hongkong dollar 85000 yuan " Wen Yuange edition of electron of 4 libraries whole book ", be sold a Li Mou by easy interesting net with the RMB 60 yuan price vendue, the development person Hong Kong of software of this electron edition enlighten annals culture publication company and century of Shanghai of publisher of software mainland area publish a group, in order to violate computer software copyright, shanghai limited company of easy interesting trade, 100 million shellfish news of easy interesting network serves limited company introduces to dock.

原价港币85000元的《文渊阁四库全书电子版》，被易趣网卖家李某以人民币60元的价格公开拍卖，该电子版软件的开发人香港迪志文化出版公司和软件大陆地区出版商上海世纪出版集团，以侵犯计算机软件著作权为由，将上海易趣贸易有限公司、亿贝易趣网络信息服务有限公司推上被告席。

Originally price Hongkong dollar 85000 yuan " Wen Yuange edition of electron of 4 libraries whole book ", be sold a Li Mou by easy interesting net with the RMB vendue of 60 yuan of prices, the development person Hong Kong of software of this electron edition enlighten after annals culture publication company and century of Shanghai of publisher of software mainland area publish what the group is in to be informed this one circumstance, in order to violate computer software copyright Shanghai limited company of easy interesting trade, 100 million shellfish news of easy interesting network serves limited company introduces to dock.

原本售价港币85000元的《文渊阁四库全书电子版》，被易趣网卖家李某以人民币60元价格公开拍卖，该电子版软件的开发人香港迪志文化出版公司和软件大陆地区出版商上海世纪出版集团在的得知这一情况后，以侵犯计算机软件著作权为由将上海易趣贸易有限公司、亿贝易趣网络信息服务有限公司推上被告席。

The nature and international, internal background of education voucher are introduced in the first part of the thesis. The system of education voucher was raised by Friedman Milton in the book- government" function in education, who is the famous economist of the new liberalism in America in 1955. in response to the lower quality and rate of the public schools" system that caused by the government monopolized the public education, and demanding that market competition mechanism and patriarch-free-choosing mechanism enter school system, in order to improve the quality of public education in America.

教育券制度是由美国著名的新自由主义经济学家米尔顿·弗里德曼于1955年在《政府在教育中的作用》中正式提出的，是针对当时美国公共教育中由于政府垄断公共教育而导致的公立学校系统质量和效率低下的状况，要求把市场竞争机制和家长自由选择机制引入学校系统，以提高美国公共教育的质量。

For this reason it is placed in the Septuagint after the Book of Judges; and this order is followed in the Vulgate and in the English translations.

基于这个原因，它被放置在septuagint后，这本书的法官；这条命令之后，在武加大，以及在英语翻译。

You should keep this book well,in order to reference in the future.

你该把这本书收好，以便将来作为参考。

You should keep this book well in order to make a reference for future.

你该把这本书收好，以便将来作为参考。

You should keep this book well in order to make a reference in the future.

你该把这本书收好，以便将来作为参考。

You should keep the book well in order to for reference in the future.

你该把这本书收好，以便将来作为参考。

What are your goals and strategies for growth?

你的成长目标和策略是什么？

And unto the angel of the church in Sardis write; These things saith he that hath the seven irits of God, and the seven star I know thy works, that thou hast a name that thou livest, and art dead.

3：1 你要写信给撒狄教会的使者，说，那有神的七灵和七星的，说，我知道你的行为，按名你是活的，其实是死的。