An administrator is securing a private cloud environment and wants to ensure only approved systems...

[Reference: https://www.cisco.com/c/en/us/products/security/what-is-network-access-control-nac.html, NAC (Network Access Control) is what the administrator should implement to ensure only approved systems can connect to switches in a private cloud environment. NAC is a security technique that controls and restricts access to network resources based on predefined policies or rules. NAC can verify and authenticate users or devices before granting them access to switches or other network devices. NAC can also enforce compliance and security standards on users or devices before allowing them to connect to switches., , ]