93W I r e l e s s L A N U s e r ’ s G u i d e802.11 network authentication method in which the APsends the client device a challenge text packet that theclient must then encrypt with the correct WEP key andreturn to the AP. If the client has the wrong key or nokey, authentication will fail and the client will not beallowed to associate with the AP. Shared key authentica-tion is not considered secure, because a hacker whodetects both the clear-text challenge and the same chal-lenge encrypted with a WEP key can decipher the WEPkey.SSID (Service Set Identifier)Service Set Identifier, a 32-character unique identifierattached to the header of packets sent over a WLAN thatacts as a password when a mobile device tries to connectto the BSS. The SSID differentiates one WLAN fromanother, so all access points and all devices attempting toconnect to a specific WLAN must use the same SSID. Adevice will not be permitted to join the BSS unless it canprovide the unique SSID. Because the SSID is broadcastin plain text, it does not supply any security to thenetwork.Subnet maskTCP-IP network is controlled by being divided intomultiple smaller networks (subnets). IP address consistsof the subnet address and the address of each computer.Subnet mask defines how many bits of IP addresscomprise the subnet address. The same value shall be setamong computers communicating with each other.TCP/IP (Transmission Control Protocol/InternetProtocol)A standard protocol of the Internet.Wi-FiWi-Fi, or Wireless Fidelity, is a set of standards for wire-less local area networks (WLAN) based on the IEEE802.11 specifications. Certified products can use theofficial Wi-Fi logo, which indicates that the product isinteroperable with any other product also showing thatlogo.