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Certificate Authentication Query

Hi Experts,

Just wish to clarify something that's I've been wondering about for some time.

I understand that certificate checks are basically accomplished by checking the hash on the lower part of the certificate to see if it is the same.  I guess my question is what will happen if i transfer this certificate to another PC for example and have the correct root CA cert, authentication for this PC will still succeed right even if the PC name is different?

Also, if I save the certificate of a server for example to the trusted root certificates folder in my PC, shouldn't that server automatically get trusted?  I am asking cause i tried this and am getting an error on the certificate saying that the certifcate cannot be verified.  Am pretty sure am missing something here. 

Thanks in advance for the help.