越来越多的私有网络连入公有网，网络管理员面临一个问题：
如何合法访问的同时，对非法访问的控制
需要在网络的边缘部署防火墙
As more and more private networks are connected to public networks, network administrators are facing a problem:
How to Control Illegal Access while Visiting Legally
Firewalls need to be deployed on the edge of the network (2019-06-23, PPT, 490KB, 下载0次)
正态分布的一个很好的课件，非那种艰涩的纯抽象讲解，有各种具体的案例，比较适合初学者深刻理解正态分布的内涵
This is a very good courseware handouts to the normal distribution. Instead of common pure abstract explanation, there are a variety of specific cases, more suitable for beginners to understand the profound connotation of normal distribution (2017-07-13, PPT, 1426KB, 下载2次)
华为S5700配置，包括基于IP子网的VLAN划分，基于IP的ACL等
The HUAWEI S5700 configuration includes VLAN partitioning based on the IP subnet, IP based ACL, and so on (2017-07-05, PPT, 561KB, 下载1次)
西安电子科技大学数字通信课件，包括信道编码，扩频通信，同步，通信网等内容，希望对大家有用
Xi an University of Electronic Science and Technology of digital communications software, including channel coding, spread spectrum communications, synchronization, communication networks, etc., in the hope that useful (2009-04-07, PPT, 9464KB, 下载165次)
组网技术
包括：网络安全技术研究的基本问题
加密与认证入侵检测、防火墙、防水墙技术
网络防病毒、网络文件备份与恢复技术等
network (2009-03-16, PPT, 2616KB, 下载14次)
以太网培训，公司资料，网络工程师考试必备，清晰PDF版本。
Ethernet training, company information, network engineers the necessary examinations, clear PDF version. (2008-07-20, PPT, 433KB, 下载26次)
这是通信网基础的课件，适合双语课程，希望对大家有帮助。 (2008-05-03, PPT, 11043KB, 下载19次)
http://www.pudn.com/Download/item/id/451722.html