Determines the learning and security modes of the port. See secureNeedToKnowMode and secureIntrusionAction to configure Need To Know and Intrusion Action on each port. (When in a learning mode, secureNumberAddresses determines the maximum number of addresses that can be learned on the port. This is set by the user.) noRestrictions(1) All learning and security are disabled. continuousLearning(2) Addresses are learned continually. If more addresses are learned than are permitted on the port, then one of the older entries will be aged out. Need To Know and Intrusion Action depends on secureNeedToKnowMode and secureIntrusionAction respectively. autoLearn(3) All addresses for this port are deleted, and then addresses are learned up to the number permitted. securePortMode is then set to secure. Need To Know and Intrusion Action depends on secureNeedToKnowMode and secureIntrusionAction respectively. secure(4) Learning is disabled. Need To Know and Intrusion Action depends on secureNeedToKnowMode and secureIntrusionAction respectively. The secureAddressLearned trap is sent whenever a station has been learned. The secureViolation trap is sent whenever a packet is received from an unauthorised station.