Microsoft Azure Architect Design (AZ-301) Practice Exam

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What is the minimum subnet requirement for deploying a set of 25 Azure virtual machines that communicate with an on-premises server?

  1. 172.16.0.0/16

  2. 172.16.1.0/28

  3. 192.168.0.0/24

  4. 192.168.1.0/28

The correct answer is: 192.168.0.0/24

To determine the minimum subnet requirement for deploying 25 Azure virtual machines, it's essential to understand how subnetting works and how many IP addresses are needed for the given scenario. When discussing subnets, each subnet needs to account for not only the virtual machines themselves but also any additional overhead required for networking, such as the network address and broadcast address. A /24 subnet, which corresponds to the option of 192.168.0.0/24, offers a total of 256 IP addresses (from 192.168.0.0 to 192.168.0.255). Out of these, two addresses are reserved (one for the network itself and one for the broadcast), leaving you with 254 usable addresses. This is more than sufficient to accommodate 25 virtual machines and allows room for growth, provisioning for other network appliances, or scaling up. In contrast, the other options provide much smaller subnets. For example, a /28 subnet only provides 16 IP addresses (14 usable), which is insufficient for 25 virtual machines. Similarly, a /28 subnet provides only 16 addresses, which again wouldn't meet the requirement. Lastly, a /16 subnet can accommodate up to 65,536 addresses, though it

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