SMC Networks 5MC2671W - Manual (Page 58)

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WEP : WE security protects your wireless LAN against
eavesdropping and unauthorized access by intruders. If WEP is
in use, all clients on the same network must use the same WEP
key settings in order to communicate with each other.
SSID : The Service Set ID of the scanned access points.
MAC Filter
The MAC Filtering feature of the SMC2671W allows you to
control access to your network clients based on the MAC (Media
Access Control) Address of the client machine. This ID is unique
to each network adapter. If MAC address filtering is enabled, then
the MAC address for each client must be listed in the table to
allow access to the network.