What could occur if a control policy for a quarantine VLAN does not include its IP range in the scope?

If a control policy for a quarantine VLAN does not include its IP range in the scope, the likely outcome is that the endpoint will revert back to the original VLAN. This occurs because the control policy is designed to manage endpoints based on their IP address range. If the IP range of the quarantine VLAN is not specified, the system may not recognize the endpoint as being part of the quarantine VLAN. As a result, the default behavior of the network policies will kick in, leading the endpoint to be restored to its previous state in the original VLAN.

In the context of network security, the objective of a quarantine VLAN is to isolate endpoints that do not meet certain security requirements. For effective management and security enforcement, it's essential that control policies are correctly configured to include any IP ranges that correspond to the defined network segments, such as the quarantine VLAN. If this aspect is overlooked, the system cannot correctly apply the intended policy, allowing the endpoint to return to a non-quarantine state without the necessary security checks, which could expose the network to vulnerabilities.