In a Versa Secure SD-WAN solution, the hub controller performs several critical functions. Firstly, it does CPE lifecycle management, handling the deployment, configuration, and maintenance updates for Customer Premises Equipment. Secondly, it acts as a control plane node responsible for managing the network's overall control operations. Finally, it can serve as a staging server, which is a transitional storage area for data in preparation for further actions. These essential functions ensure efficient management, control, and deployment within the SD-WAN framework.