SSID
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SSID

• The service set identifier (SSID) is a logical name used to identify an 802.11 wireless network.
• “The four 802.11 topologies utilize the SSID so that the radios can identify each other. The radios use this logical name in several different 802.11 frame exchanges.”
• The SSID is a configurable setting on all 802.11 radios, including access points and client stations.
• The SSID can be made up of as many as 32 characters and is case sensitive.
• Most access points have the ability to cloak an SSID and keep the network name hidden from illegitimate end users.
  Hiding the SSID is a very weak attempt at security that is not defined by the 802.11-2012 standard.
  

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Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.