Router receives frame 路由器接到帧
If a server, server frame, router, or other device in one cell were to become inoperable, isolation of the hardware insures that it doesn't impact another cell.
如果一个单元内的服务器、服务器框架、路由或其他设备变得无法操作，硬件的隔离会确保这种情况不会影响到其他单元。
One day it is a frame relay switch, the next it is your ISDN router.
这一天是帧中继交换机，这是你们未来的ISDN路由器。
Switch A does not have the MAC address of Router Y and will therefore flood the frame out its ports.
交换器A因为没有路由器Y的MAC位址，所以会将这个讯框从所有的埠泛流出去。
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