What is the main purpose of implementing "port security" on a switch?

The main purpose of implementing port security on a switch is to enhance network security by limiting the number of MAC addresses that can be associated with a port. This functionality provides a safeguard against unauthorized access to the network by preventing devices that are not recognized from connecting to the switch port. By configuring port security, network administrators can specify how many and which MAC addresses are allowed on a specific port, enabling them to effectively mitigate risks such as MAC flooding attacks or the accidental connection of unauthorized devices.

When port security is enabled, the switch will react in a predefined manner if a violation occurs, such as shutting down the port or placing it into a restricted state. This enforcement of MAC address limits adds a layer of control to the network environment, ensuring that only trusted devices can communicate over the designated switch ports. This is particularly valuable in environments where security is a critical concern, as it helps maintain the integrity and availability of the network.