MAC Address Locking
One additional wireless security measure that you can take that has not yet been discussed is MAC address locking (often called MAC address filtering). Because each wireless card has a unique identifier called a MAC address, we could instruct the wireless router to accept connections only from the wireless cards that we know. This is called MAC address locking.
Turning on MAC address locking is not trivial and can be a bit of trouble. Remember, with every security measure enabled, you typically lose some flexibility. For example, with MAC address locking enabled, you need to change the configuration on the wireless router if you buy a new wireless card or device. Also, if you have visitors who want temporary Internet access, ...
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