You are onsite with a client to perform a post-deployment site survey. When verifying a multiple channel VoWiFi deployment using a VoWiFi handset, which aspect is most important?

The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz).
What is the center frequency of channel 4?

You are performing a post-implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?

What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?

You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11-
2016 standard that was not available before the ratification of 802.11 ac?