switch 和hub有什么不同

[月下独酌]

搞糊涂了，谁解释一下

 

[former-ABC]

简单来讲， switch比hub价钱贵，技术复杂，更多花里胡哨的功能。

复杂来讲，switch能够满足每个端口同时达到最大物理带宽。hub是共享的。一个24端口的switch一般能够达到2.4G的吞吐。还有些特殊的功能。。。

无论多少个端口，hub最大的带宽就是物理带宽。100Mbps的24端口hub，100Mbps带宽由所有用户共享。用户越多，每个用户可用带宽就越少。

 

[吾言]

简单的讲, HUB是所有端口共享带宽, SWITCH是每个端口独享带宽.

复杂的讲, HUB是物理层的设备, SWITCH是数据链路层的设备. 两者的工作原理方式不同.

 

[月下独酌]

tks

 

[GreenGable]

hubs work on physical layer, all the ports share the broadcast/collission domain, which means collissions happen when more than one hosts try to send bits at the same time.

switches work on data-link layer, every port owns its own broadcast/collission domain, no collissions will happen, which means all the ports can maintain their 10 or 100Mbps bandwidth.

 

[Richter]

通俗点讲，switch的好处就是它给每台连接的电脑是固定的虚拟IP，寻址快也更稳定，而hub是给的是动态的IP。至于带宽，对于共享DSL，你能用的带宽是固定的。

 

[吾言]

Hub and switch has nothing to do with IP.

Hub is layer 1 device. Switch is layer 2 device. And IP works on network layer, which is layer 3.

 

[无业游民]

Now understand. hub:layer1,swithch:layer2. Router has something to do with IP, so it's layer3 device.

Layer 4 device must be next generation communicaiton device. Let's keep an eye on those comanys producing layer 4 devices. A couple of them will be next CISCO or Lucent. Buy!