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发表于 2008-8-8 13:04:07
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交换机mac地址表和路由器路由表的对比，摘自CCNA学习指南第一章
Bridges and switches read each frame as it passes through the network. The layer-2 device
then puts the source hardware address in a filter table and keeps track of which port the frame
was received on. This information (logged in the bridge’s or switch’s filter table) is what helps
the machine determine the location of the specific sending device.
The real estate business is all about location, location, location, and it’s the same way for
both layer-2 and -3 devices. Though both need to be able to negotiate the network, it’s crucial
to remember that they’re concerned with very different parts of it. Primarily, layer-3 machines
(such as routers) need to locate specific networks, whereas layer-2 machines (switches and
bridges) need to eventually locate specific devices. So, networks are to routers as individual
devices are to switches and bridges. And routing tables that “map” the internetwork are for
routers, as filter tables that “map” individual devices are for switches and bridges.
路由器关心的是网络，交换机关心的是主机
PS:老外的书就是能扯,我才看了一章，就扯到了世界和平、红绿灯、阿波罗飞船、房地产
[ 本帖最后由 oldjiang 于 2008-8-8 13:10 编辑 ] |
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发表于 2008-8-10 00:32:08