傳統(tǒng)的以太網(wǎng)是一個(gè)廣播型網(wǎng)絡(luò)，網(wǎng)絡(luò)中的所有主機(jī)通過HUB 或交換機(jī)相連，處在 同一個(gè)廣播域中。HUB 是物理層設(shè)備，沒有交換功能，接收的報(bào)文會(huì)向所有端口轉(zhuǎn) 發(fā)；交換機(jī)是鏈路層設(shè)備，具備根據(jù)報(bào)文的目的MAC 地址進(jìn)行轉(zhuǎn)發(fā)的能力，但在 收到廣播報(bào)文或未知單播報(bào)文（報(bào)文的目的MAC 地址不在交換機(jī)MAC 地址表中） 時(shí)，也會(huì)向除交換機(jī)報(bào)文入端口之外的所有端口轉(zhuǎn)發(fā)。 上述情況使網(wǎng)絡(luò)中的主機(jī)會(huì)收到大量并非以自身為目的地的報(bào)文，在浪費(fèi)大量帶寬 資源的同時(shí)，也造成了嚴(yán)重的安全隱患。 隔離廣播域的傳統(tǒng)方法是使用路由器，但是路由器成本較高，而且端口較少，無法 劃分細(xì)致的網(wǎng)絡(luò)。 為解決以太網(wǎng)交換機(jī)在LAN 中無法限制廣播的問題，出現(xiàn)了VLAN（Virtual Local Area Network，虛擬局域網(wǎng)）技術(shù)。
標(biāo)簽： 以太網(wǎng) 廣播 網(wǎng)絡(luò)
上傳時(shí)間： 2014-01-03
上傳用戶：qb1993225
csma協(xié)議，802.15.4協(xié)議的mac層的c文件
上傳時(shí)間： 2016-12-02
上傳用戶：lwwhust
csma協(xié)議，802.15.4協(xié)議的mac層header文件
上傳時(shí)間： 2013-11-29
上傳用戶：z754970244
csma協(xié)議，802.15.4協(xié)議mac層cmn文件，從下個(gè)文件開始頭文件和c文件將打包在一起上傳
上傳時(shí)間： 2013-11-28
上傳用戶：BOBOniu
csma協(xié)議，802.15.4協(xié)議mac層transac的c文件和header文件
上傳時(shí)間： 2016-12-02
上傳用戶：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.
標(biāo)簽： development adaptable solutions patterns
上傳時(shí)間： 2014-09-07
上傳用戶：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.
標(biāo)簽： following absorbing the includes
上傳時(shí)間： 2014-01-04
上傳用戶：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.
標(biāo)簽： high-performance full-feature derivatives Infineon
上傳時(shí)間： 2016-12-12
上傳用戶：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"
標(biāo)簽： cross-platform supporting FileZilla graphical
上傳時(shí)間： 2013-12-19
上傳用戶：weiwolkt
delphi編寫的遠(yuǎn)程開機(jī)軟件，通過多波mac地址，遠(yuǎn)程開機(jī)，關(guān)鍵是主板bios設(shè)置
標(biāo)簽： delphi 編寫 開機(jī) 遠(yuǎn)程
上傳時(shí)間： 2016-12-20
上傳用戶：sy_jiadeyi
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