摘 要：英特网的发展对全世界的信息产业带来巨大的变革和深远的影响，尤其是网络技术高速发展的今天，企业网络的优劣已经成为衡量企业竞争力的标准之一。针对这一需求，本文介绍了中小型企业网络的整体设计方案。考虑到网络的实际的应用需求，本方案采用三层网络结构：以核心层三层交换机为中心，再以汇聚层两个内外网交换机为分叉，最后向下分到接入层各个部门的交换机，然后链接到各个终端上使用。在服务器群组搭建了FTP、Email、WEB及DNS服务器。针对于网络中可能存在的安全威胁，方案中给出了防火墙技术、VLAN技术以及VPN技术用来构建一个安全可靠的企业网络。另外本文对中小型局域网基本维护和管理方面的工作进行简单的介绍。56750

毕业论文关键词：企业局域网、交换机、防火墙，维护和管理。

Abstract：Internet development has brought great change and far-reaching impact on the information industry worldwide, especially the rapid development of network technology merits of today's enterprise networks has become one of the standard measure of the competitiveness of enterprises. In response to this demand, the paper describes the overall design of the small and medium enterprise networks. Considering the actual application requirements of the network, the program uses three-tier network architecture: the core layer three switches to the center, then the two inside and outside the network aggregation layer switches to the bifurcation, and finally down to the various departments assigned to the access layer switch, and then link to the use of each terminal. In the server group set up FTP, Email, WEB and DNS servers. Against possible security threats in the network, the program gives the firewall technology, VLAN technology and VPN technology used to build a secure enterprise network. Also this paper, basic maintenance and work for small and medium local area network management simple introduction.

Keywords： Enterprise local area network (LAN), switches, firewalls, maintenance and management.

 目   录 

1 前言 3

2 需求分析 3

2.1 项目背景 3

2.2 设计目标 3

2.3 预期实现的局域网功能 4

3 网络拓扑设计 4

3.1 网络整体拓扑 4

3.1.1 核心层设计 5

3.1.2 汇聚层设计 7

3.1.3 接入层设计 11

3.2  VLAN的划分以及IP地址规划 11

3.3  服务器的规划设计 12

3.3.1  FTP服务器 12

3.3.2 Email服务器 14

3.3.3 WEB服务器 15

4 网络安全 16

4.1 网络安全需求分析 16

4.2 网络安全设计部署 17

4.2.1防火墙 17

4.2.2 VLAN技术 17

4.2.3 VPN 18

4.2.4 数据保护措施 19

5 局域网维护和管理 19

结论 26

参考文献 27