For a wireless network with WPA2 PSK authentication and SSID broadcast, the user can double-click on the SSID and enter the correct username and password to access the network.

What is the security policy based on user authentication that is currently widely used in enterprise networks? (Multiple Choice)

802.11 has three frame types, which are (Select 3 Answers).

The gain of antenna A is 11dBi, and the gain of antenna B is 8dBi. It can be said that antenna A has a larger gain than antenna B.

When the two-channel center frequency distance is less than or equal to 25 MHz, there is an overlapping area between the channels, and there may be some interference. Therefore, in order to avoid adjacent channel interference in adjacent area channel planning, the same channel is not allowed.