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the trend toward fewer users per segment is known as microsegmentation. micro-segmentation allows the creation of private or dedicated segments—that is, one user per segment. each user receives instant access to the full bandwidth and does not have to contend for available bandwidth with other users. as a result, collisions (a normal phenomenon in shared-medium networks employing hubs) do not occur, as long as the equipment operates in full-duplex mode. a lan switch forwards frames based on either the frames layer 2 address (layer 2 lan switch) or, in some cases, the frames layer 3 address (multilayer lan switch). a lan switch is also called a frame switch because it forwards layer 2 frames, whereas an atm switch forwards cells.
figure 26-1: a lan switch is a data link layer device 【程序编程相关:auto secure命令的使用】
figure 26-1 illustrates a lan switch providing dedicated bandwidth to devices and illustrates the relationship of layer 2 lan switching to the osi data link layer. 【推荐阅读:实战破解交换机密码】
history 【扩展信息:如何快速的配置Cisco PIX Fir】560)this.style.width=560; onmousewheel = javascript:return big(this) src="/files/uploadimg/20060622/1610310.gif"> the earliest lan switches were developed in 1990. they were layer 2 devices (bridges) dedicated to solving desktop bandwidth issues. recent lan switches evolved to multilayer devices capable of handling protocol issues involved in high-bandwidth applications that historically have been solved by routers. today, lan switches are used to replace hubs in the wiring closet because user applications demand greater bandwidth.... 下一页