3. LAN technologies - Wireless LANs. (10%) (1) What radio frequency bands, speeds and spread spectrum technologies are used by the WLAN standards IEEE 802.11a, b, g, n? Please fill in the blanks for these standards. IEEE standard Speed Frequency Technology IEEE 802.11a Up to GHz Mbps IEEE 802.11.b Up to Mbps IEEE 802.11.g Up to GHz Mbps IEEE 802.11n Up to GHZ Mbps GHz (2) What is the media access control method used in WLAN? What is the difference between this method and the CSMA/CD used in Ethernet? (3) What are the three stages of IEEE 802.11 WLAN connection process? (4) Refer to the diagram below. Answer the following questions. Switch Swach Switch Ethernet Connection AP AP1 SSID AAA SSID 4 BBB AP SSID #AAA --Wireless Connection Client Client 2 Clients SSID = AAA SSID = BBB SSID AAA What identifier is used to identify a service set (or a wireless network)? How many service sets (or wireless networks) are created in the above diagram? What type of the WLAN topology is the wireless network with the SSID named AAA