I am following the link below for our root CA migration. The current CA is on a DC and I am going to migrate to on an another DC. This case the new DC will have the same name as the old. My question, Should I install CA first and configure it before I promote the server to be the new DC or first promote it as Dc then install CA?
https://blogs.technet.microsoft.com/canitpro/2014/11/11/step-by-step-migrating-the-active-directory-certificate-service-from-windows-server-2003-to-2012-r2/