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Access point can regularly broadcast its SSID to allow wireless devices detect the network and join in.
If possible, you should disable periodic broadcast of the SSID for a more secure network, BUT:
disabling SSID brooadcast provides virtually no protection;
disabling SSID brooadcast prevents only a casual unauthorized user from connecting to the network.
Your wireless clients must already know network's SSID to join the network. However,
SSID is easily discovered because it is present in other transmissions sent by the wireless router
Turning off SSID beaconing may impact mobility of some users, because their wireless devices may have hard time moving freely from one wireless network to another.
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