Access Control Policies protect services from external access. These policies add authentication in front of your services, granting access to registered users only.
When a user request comes in, Traefik Hub forwards it to the Traefik Hub Agent on your cluster. The Traefik Hub Agent authenticates the request, and if successful, forwards it to the service.
Access Control Policies are resources with a name, an authentication method, and configuration parameters depending on the specific method you choose. Each resource is linked to a Traefik Hub Agent and cannot be shared across agents.