(The basic function of the switch is equivalent to a transparent bridge. The bridge cannot modify the frame it forwards; by listening to the source MAC address in the data frame on the port, the bridge can learn the MAC of other devices, and the bridge builds a MAC address. Table, which is used by the switch to forward data frames based on the policy MAC. For a packet with a policy multicast or broadcast MAC address, it is necessary for the bridge to forward it to everything other than the port that started receiving the broadcast.
Understand and configure 802.Q802.1s and 802.1w Spanning Tree Protocol
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