The AVERAGEIFS function expands on the AVERAGEIF function by allowing multiple criteria to determine the subset of data

Which of the following is NOT one of the recommended steps to take in troubleshooting a networking problem?

A) Isolate and document the problem. B) Escalate the problem to someone who can resolve it. C) Resolve the problem. D) Monitor the problem for an extended period.

Forming a hierarchy beginning with a master key from which other keys are derived dynamically and used for a limited period of time, __________ are used for communication between a pair of devices typically between a STA and an AP.

Fill in the blank(s) with the appropriate word(s).