Which of the following can be used for both security and loop prevention?

The correct choice for a feature that can be used for both security and loop prevention is MAC move limiting. This function serves a dual purpose: it helps secure the network by preventing unauthorized devices from connecting and moving through a switch, which could lead to MAC flooding or other security breaches. At the same time, it helps in loop prevention by limiting the number of times a MAC address can be moved between ports on a switch within a configured time frame. This helps to maintain a stable and efficient forwarding table, which is crucial in preventing loops in the network topology.

MAC move limiting ensures that if a device is detected attempting to change its location frequently across ports, the network can take appropriate action, such as shutting down the port, which protects the overall network integrity. This makes it an effective safeguard against both unauthorized access and potential loops that can disrupt network traffic.

Other options, while beneficial for network management and security, do not encompass both functionalities of security and loop prevention effectively in the same manner.