Which of the following are the RF cable commonly used in WLAN distribution systems? (Multiple choice)

What type of frame does the ACK frame belong to in the WLAN?

When the channel interference of the 2.4 GHz band is large and severe, the device is adjusted to 3 channels, which can effectively reduce interference.

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.

In the WLAN, ACK frame belongs to what type of frame?