Final answer:
To allow only one computer to login on a particular jack, MAC address filtering can be set up on the network switch, allowing only the specific computer's MAC address to communicate through that port and utilizing port security features for added protection.
Step-by-step explanation:
An effective method to configure a network to allow only a single computer to login on a particular jack is by implementing MAC address filtering. This can be done through the network switch that the jack is connected to. The process involves accessing the switch's configuration settings and setting up a MAC address filtering rule that allows only the registered MAC address of the computer in question to communicate through that specific port. For enhanced security, combining MAC address filtering with port security features like limiting the number of MAC addresses can prevent unauthorized access.