While previously recommended as a security measure, disabling SSID broadcast is not effective against
most attackers because network SSIDs are:

A.
no longer used to authenticate to most wireless networks.

B.
contained in certain wireless packets in plaintext.

C.
contained in all wireless broadcast packets by default.

D.
no longer supported in 802.11 protocols.

Explanation:
The SSID is still required for directing packets to and from the base station, so it can be discovered using a
wireless packet sniffer.Incorrect Answers:
A, D: The SSID is still used as a unique identifier for a wireless LAN. It is therefore still valid for
authentication, and also still supported in 802.11 protocols.
C: Devices which are configured to connect to a network which does not broadcast its SSID may try to
connect to the network by broadcasting for the network. This results in the SSID being revealed to
wireless snoopers in the vicinity of the device. It is not included by default.

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 61
http://en.wikipedia.org/wiki/Service_set_(802.11_network)