Frank configures an access control list to ensure that only specific IP addresses are able to connect to a service. What type of control has he deployed?

Access control lists are best described as technical controls. Managerial controls are procedural mechanisms; physical controls are controls that impact the physical world, like locks or fences; and operational controls are processes used to manage technology in a secure manner, like the change management process Frank will likely follow to make changes to the access control list.