Sending, receiving host and router calculate CRC to check FCS field, and what about switches ? Does switch check FCS field before forward frames ? I cannot find exact answer for this.

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解决方案

Here's a description of a store-and-forward switch that checks FCS before sending it on. FCS could only be done for store-and-forward, it seems, since you have to have the whole packet to calculate the FCS. But that doesn't mean all switches do this on store-and-forward.

Edit:

Also found that a switch in cut-through mode will forward a packet with an incorrect FCS left intact.

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