Are digital certificates replicated in a Cisco ASA’s Active/Standby failover configuration?

Yes. Third-party digital certificates which are used in HTTPS (ie. from Entrust, Verisign, Microdoft,etc) that are installed on the Active ASA are replicated to the Standby ASA in an active/standby failover configuration. However, the ASA’s local CA-generated certificates which are used for SSL VPN remote access are not replicated to the standby ASA.