D-Link DES-3350SR User Manual - page 54
D-Link DES-3350SR Standalone Layer 3 Switch
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Figure 7 - 25. Time Zone and DST Settings window
This window allows you to set the Daily Saving Time repeated and annual settings. Click Apply to let your changes take effect.
Port Security
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
changing the Admin State 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(s), from connecting to the switch’s locked ports and gaining access to the network.