传统的以太网是一个广播型网络，网络中的所有主机通过HUB 或交换机相连，处在 同一个广播域中。HUB 是物理层设备，没有交换功能，接收的报文会向所有端口转 发；交换机是链路层设备，具备根据报文的目的MAC 地址进行转发的能力，但在 收到广播报文或未知单播报文（报文的目的MAC 地址不在交换机MAC 地址表中） 时，也会向除交换机报文入端口之外的所有端口转发。 上述情况使网络中的主机会收到大量并非以自身为目的地的报文，在浪费大量带宽 资源的同时，也造成了严重的安全隐患。 隔离广播域的传统方法是使用路由器，但是路由器成本较高，而且端口较少，无法 划分细致的网络。 为解决以太网交换机在LAN 中无法限制广播的问题，出现了VLAN（Virtual Local Area Network，虚拟局域网）技术。
上传时间： 2014-01-03
上传用户：qb1993225
csma协议，802.15.4协议的mac层的c文件
上传时间： 2016-12-02
上传用户：lwwhust
csma协议，802.15.4协议的mac层header文件
上传时间： 2013-11-29
上传用户：z754970244
csma协议，802.15.4协议mac层cmn文件，从下个文件开始头文件和c文件将打包在一起上传
上传时间： 2013-11-28
上传用户：BOBOniu
csma协议，802.15.4协议mac层transac的c文件和header文件
上传时间： 2016-12-02
上传用户：450976175
Design patterns are elegant, adaptable, and reusable solutions to everyday software development problems. Programmers use design patterns to organize objects in programs, making them easier to write and modify. C# Design Patterns: A Tutorial is a practical guide to writing C# programs using the most common patterns. This tutorial begins with clear and concise introductions to C#, object-oriented programming and inheritance, and UML diagrams. Each chapter that follows describes one of twenty-three design patterns, recommends when to use it, and explains the impact that it will have on the larger design. The use of every pattern is demonstrated with simple example programs. These programs are illustrated with screen shots and UML diagrams displaying how the classes interact. Each of these programs is available on the companion CD-ROM and can be run, examined, edited, and applied.
标签： development adaptable solutions patterns
上传时间： 2014-09-07
上传用户：wangchong
The following is a list of MATLAB codes which includes the radar absorbing material design, the antenna pattern, the observation points generation, and the amplitude error and phase error calculations.
标签： following absorbing the includes
上传时间： 2014-01-04
上传用户：l254587896
The XC226x derivatives are high-performance members of the Infineon XC2000 Family of full-feature single-chip CMOS microcontrollers. These devices extend the functionality and performance of the C166 Family in terms of instructions (MAC unit), peripherals, and speed. They combine high CPU performance (up to 80 million instructions per second) with extended peripheral functionality and enhanced IO capabilities. Optimized peripherals can be adapted flexibly to meet the application requirements. These derivatives utilize clock generation via PLL and internal or external clock sources. Onchip memory modules include program Flash, program RAM, and data RAM.
标签： high-performance full-feature derivatives Infineon
上传时间： 2016-12-12
上传用户：wab1981
FileZilla is a cross-platform graphical FTP, FTPS and SFTP client a lot of features, supporting Windows, Linux, Mac OS X and more. FileZilla Server is a reliable FTP server for Windows. it is a Client App,and a linux gnu version. important:change EXT name to ".tar.bz2"
标签： cross-platform supporting FileZilla graphical
上传时间： 2013-12-19
上传用户：weiwolkt
delphi编写的远程开机软件，通过多波mac地址，远程开机，关键是主板bios设置
上传时间： 2016-12-20
上传用户：sy_jiadeyi
