Which tcp/ip troubleshooting command should you use to determine whether a client and server are communicating with each other?

The answer is The ping command.   The tcp/ip troubleshooting command you should  use to determine whether a client and server are communicating with each other is The ping command.  The ping command is used to verify that a device can communicate with another on a network.

It is unfair competition and shall lead to poor content provision.

Explanation:

By search engines sharing search rankings, that shall be unfair competition.This is because, ranking is a competition, the ground for competition has to be levelled if at all the competition is going to be fair.Search engines shall also provide poor content if they sell their rankings, since, someone with poor content but has money shall rank higher compared to someone with good content but lacking money to pay for a higher rank.