You will deploy an Azure Application Gateway with: 1 public endpoint, 1 private endpoint, minimum instances = 1, maximum instances = 10. VNet1 uses a /24. What is the minimum number of assignable IP addresses the Application Gateway subnet must provide (minimize allocated IPs)?
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Correct answer: 11.
Why this is the answer
The Application Gateway requires a minimum of 5 available IP addresses for internal operations when configured with a minimum instance count of 1. This is a fixed requirement regardless of the number of instances. Additionally, each instance of the Application Gateway consumes one IP address. Since the minimum instances is 1, this adds 1 more IP address. Therefore, the total minimum required IP addresses are 5 (base) + 1 (for the instance) = 6. However, Azure reserves the first 5 IP addresses in any subnet for internal use (network address, broadcast address, and 3 for Azure internal services). So, 6 (required by AG) + 5 (reserved by Azure) = 11. Incorrect options: 1 and 2 are too low, not accounting for Azure's reserved IPs or the Application Gateway's operational requirements. 12 and 20 are higher than the minimum required, which contradicts the "minimize allocated IPs" instruction.
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