1摘要
摘 要：“基于Cisco技术的某学校网络规划设计与实现”，在这个设计中用到了Cisco的交换与路由技术、Cisco的安全技术等等。
基于Cisco技术的某学校网络规划设计与实现是完成一个学校的网络通信，用有限的资金最优的完成网络通信问题。学校的几个主要地方都可以在内部进行通信也可以和外部进行通信。在这个设计中分成了三个层次，最上面是核心层，用的是千兆的带宽；其次是分布层，用的是百兆的带宽；最下面是接入层，在接入层中针对不同的用户需求，用不同的带宽，但以十兆为大多数。每个不同的层次有不同的功能，核心层在学校的中心机房，主要负责这个学校的网络维护，内部网络与外部网络的通信，提供高的可靠性，提供冗余链路等等；分布层是网络核心层和接入层之间的分界点，这一层主要功能实现如策略、安全、VLAN、路由间的重分布，静态和动态路由选择协议之间的划分，介质翻译等等；接入层是为用户提供对网络中的本地网段的访问，对分布层的访问控制和策略进行支持，建立独立的冲突域等等。
在这个设计中最重要也是最关键的是Cisco公司的交换机和路由器进行配置，在配置时是按照设计时的层次来的这样可以减少出错并且能更加的体现每一层次的特点、功能。加在远程访问
路由器后面的PIX防火墙是Cisco公司著名的软硬件结合的专用安全设备，所有流经PIX的数据都必须接受严格而全面的检验，检验内容包括数据的源和目标地址、TCP随机序列号、TCP端口号和附加标志等，只有满足特定条件的数据才能穿过这道防火墙。web技术的三个关键技术
在网络规划和设计过程中，从完成拓扑到最后的测试都非常顺利。
关键词：Cisco 核心层 分布层 接入层 PIX防火墙
2Abstract
Abstract: "Based on Cisco technology in a school network design and implementation " In this design used in the Cisco exchange and  routing technology、Cisco's security technology, and so on.
Based on Cisco technology in a school network planning 、design and implementation of a complete communications network of schools, with limited funds to complete the optimal network communications. Several schools are the main places in the internal communication can and external communications. In the design carved into three levels, th
e top of the core layer, with the gigabit bandwidth; Secondly, the distribution layer, the 100M is the bandwidth; Access is the lowermost layer, access layer for different needs of users with different bandwidth. But for the majority of advances.，each different levels have different functions, the core layer in the center of the school room, primarily responsible for the maintenance of the school network, the internal network and external communications network to provide high reliability, provide redundant links, and so on. Distribution of the core layer is the network layer and the access layer boundaries, This layer of the main functions of achieving such as strategy, security, VLAN, the re-routing distribution, Static and dynamic routing agreement between the division and medium interpreters; Access layer is to provide users of the network of local network visit to the distribution layer of access control and support strategy, the establishment of an independent conflict-domain, and so on.