Final answer:
You can ban or unban compromised clients through FortiManager, a centralized management platform for network security. Administrators use it to manage security policies and configurations for FortiGate devices.
Step-by-step explanation:
The place where you can ban or unban compromised clients within a network security context is through the FortiManager. FortiManager is a centralized security management platform that allows administrators to manage various aspects of their FortiGate devices, including security policies, device configuration, and updates. If a client is compromised or behaving maliciously, an administrator can go to the FortiManager to update the policy and ban the client. To unban a client, the process is reversed; the administrator would remove the client from the banned list via the same management interface.