HOW TO DOWNLOAD CERTIFICATE FROM OPENCLASSROOM FUNDAMENTALS EXPLAINED

I've a DAG natural environment with six servers(2Mailbox+2CAS+2EDGE,Exchange2013 CU21), on that scenario, I just do the method in any one mailbox server (for example MX1SVR) after which wait the new certificate to replicated to the other 5 servers during some hrs ? OR i ought to run precisely the same method on just one CAS server and just one EDGE