Which third-party Enterprise CA server must be used for a cloud-based vSmart controller?

Cisco SD-WAN cloud-based controllers (vManage, vBond, vSmart) specifically use Cisco's own cloud-based certificate authority, 'RootCert,' for automated certificate management and authentication within the SD-WAN fabric.

VeriSign (now DigiCert/Symantec) is a public CA, but it is not the designated or mandated CA for Cisco's cloud-based SD-WAN controllers.

Microsoft Certificate Authority (AD CS) can be used for on-premise SD-WAN deployments with an enterprise CA, but it is not the required CA for cloud-based controllers.

RADIUS is an authentication, authorization, and accounting protocol, not a Certificate Authority (CA) server responsible for issuing and managing digital certificates.