What is the purpose of SSID (Service Set Identifier) in 802.11, and what are the three SSID types defined by the standard?

• A.SSID is the MAC address of the access point; there is only one type of SSID. WPA2-Enterprise uses a single pre-shared key distributed to each employee. Dual-band access points bridge the two radios, so 2.4 GHz clients consume 5 GHz airtime. Wireless client isolation blocks clients from the internet while allowing peer traffic, the reverse of its real effect. Roaming between access points requires the client to obtain a new IP address on the same subnet
• B.SSID is encrypted in beacon frames; passive scanning cannot discover the SSID.
• C.IBSS (ad-hoc) mode is the most secure Wi-Fi mode because there is no AP that can be compromised.
• D.SSID is the name identifying a wireless network (up to 32 bytes). Three types: BSS (Basic Service Set) - single AP with its associated clients; ESSID (Extended Service Set) - multiple APs sharing the same SSID forming a single logical wireless network (roaming domain); IBSS (Independent Basic Service Set) - peer-to-peer (ad-hoc) network with no AP; clients communicate directly. Modern enterprise networks use ESSID with multiple APs on the same SSID to provide seamless coverage.