单选题A receiving host computes the checksum on a frame and determines that the frame is damaged.Theframe is then discarded.At which OSI layer did this happen?（）AsessionBnetworkCphysicalDdatalinkEtransport
单选题
A receiving host computes the checksum on a frame and determines that the frame is damaged.Theframe is then discarded.At which OSI layer did this happen?（）
A
session
B
network
C
physical
D
datalink
E
transport
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