For an antenna 35 dBi of gain is needed. What antenna type should be used to achieve this gain?
Response:

You told your customer that multipath fading may be mitigated simply by moving one or both of the receivers antennas a small amount, usually by one to four wavelengths away from its original position. Your customer is prepared to make the change, but does not know the wavelength for
802.11ac.
What is the approximate wavelength of an 802.11ac radio wave?

For what purposes are VPNs typically used in modern WLANs?(Choose all that apply.) Response:

After designing and deploying a WLAN infrastructure, you realized the CCI is causing poor performance in the 2.4 GHz band. Primarily, you've designed the WLAN for 5 GHz and 2.4 GHz as a best effort. You found out that the implementers didn't follow your guidelines when configuring the WLAN infrastructure. What can you do to minimize as much as possible the CCI impact in the 2.4 GHz band?