D-Link DES-3326SR User Manual page 185

DES-3326SR Layer 3 Fast Ethernet Switch User's Guide
Use the Speed/Duplex<Auto> pull-down menu to either select
the speed and duplex/half-duplex state of the port. Auto –
auto-negotiation between 10 and 100 Mbps devices, full- or
half-duplex. The Auto setting allows the port to automatically
determine the fastest settings the device the port is connected
to can handle, and then to use those settings. The other
options are 100M/Full, 100M/Half, 10M/Full, and 10M/Half.
There is no automatic adjustment of port settings with any
option other than Auto.
Port Security and MAC Address Learning
A given port's (or a range of port's) dynamic MAC address
learning can be locked such that the current source MAC
addresses entered into the MAC address forwarding table can
not be changed once the port lock is enabled. The port can be
locked by using the Learn <Disabled> pull-down menu to
Enabled, and clicking Apply.
This is a security feature that prevents unauthorized
computers (with source MAC addresses unknown to the switch
prior to locking the port (or ports) from connecting to the
switch's locked ports and gaining access to the network.
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