Exam AZ-104 Topic 2 Question 123 Discussion

Actual exam question for Microsoft's AZ-104 exam
Question #: 123
Topic #: 2
You have an Azure virtual network named VNetl that contains the following settings:
* IPv4 address space: 172.16.10.0/24
* Subnet name: Subnetl
* Subnet address range: 172.16.10.0/25
What is the maximum number of virtual machines that can connect to Subnetl?

Suggested Answer: C Vote an answer

Detailed Explanation
A /25 subnet contains 128 total IP addresses (2^(32-25) = 128). Azure reserves five IP addresses in every subnet regardless of its size: the network address (first address), the default gateway (second address), two addresses reserved for Azure ' s internal DNS mapping (third and fourth addresses), and the broadcast address (last address). Subtracting these five reserved addresses from the 128 total leaves 123 usable addresses for virtual machine NICs and other resources - 128 # 5 = 123. This reservation is a fixed platform behavior applied to every Azure subnet independent of its size, which is a frequently tested distinction from traditional on-premises subnetting math (which usually reserves only two addresses, network and broadcast). Option C (123) is correct and unchanged.
Official Reference
Add, change, or delete a virtual network subnet - https://learn.microsoft.com/en-us/azure/virtual-network
/virtual-network-manage-subnet

by Nick at Oct 10, 2026, 06:35 PM

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