VNet1 uses IPv4 172.16.10.0/24 and Subnet1 is 172.16.10.0/25. What is the maximum number of virtual machines that can be assigned IPs in Subnet1?
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Correct answer: 123.
Why this is the answer
A /25 subnet mask means there are 2^(32-25) = 2^7 = 128 available IP addresses in the subnet. Azure reserves the first four and the last IP address in every subnet for internal use. These reserved IPs are: the network address, the first IP for the Azure host, the second IP for DNS, the third IP for future use, and the broadcast address. Therefore, the number of usable IPs is 128 - 5 = 123.
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