AZ-104 Certification Practice Question #263

Question

You have an Azure virtual network named VNet1 that contains the following settings:

•	IPv4 address space: 172.16.10.0/24
•	Subnet name: Subnet1
•	Subnet address range: 172.16.10.0/25

What is the maximum number of virtual machines that can connect to Subnet1?

Accepted Answer

In IP routing, a /25 subnet mask uses 25 bits for the network identifier and leaves 7 bits for host addressing. This yields a total of 128 IP addresses (2^7). However, Azure reserves 5 IP addresses within each subnet: the first four addresses (which include the network ID, default gateway, and Azure DNS service mappings) and the final address (the broadcast address). Therefore, the maximum number of virtual machines (or other resources) that can be connected to the subnet is 128 minus 5, which equals 123.

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