This value sets the password used when authenticating devices via MAC address authentication, whether checked locally or against a RADIUS server, though the field returns either a blank or masked value on read for security reasons. An admin configures this shared password as part of setting up MAC-based authentication, unless the switch is instead configured to use each client's own MAC address as its password. For example, an admin might set this to a fixed passphrase used for all MAC-authenticated devices when not relying on the per-device MAC-as-password option.