Can CSMA/CD in ethernet tell the sender when the client has gotten a packet that is "damaged"?

If a client receives a damaged packet then it will know that after comparing the packet's checksum to the one in the header. But can a sender know when a packet has reach开发者_C百科ed the client in a damaged form?

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First of all, it seems you are making a confusion. CSMA/CD is for detecting when somebody else is using the link so that a collision doesn't happen. It's its only purpose.

Second, ethernet senders cannot find out if the frame they sent arrives malformed. There is no acknowledgement. The upper-layer protocols must take precautions.