We will create a List<string> object that contains a collection of machine IP addresses. The Parallel.ForEach loop will check the IP addresses to see whether the machines on the other end of the given IPs are alive. It does this by pinging the IP address. The method that performs the Parallel.ForEach loop will also be given the minimum required alive machines as an integer value. If the minimum number of machines alive is not met, an exception is thrown.