You are a network engineer for a mid-sized consulting company. Your employer is currently in the role of a systems integrator for a transformation project at a retail company. You have been tasked with configuring a new network switch. Upon accessing the switch via SSH you receive a message stating only authorized users from ACME Enterprise and authorized 3rd party partners are permitted. You are not required to acknowledge or accept this warning in any way. What type of control best classifies this type of message?