Question

Difficulty: EasyCreate and Configure Virtual Networks and Subnets

You configure an Azure virtual network with an address space of $10.0.0.0/24$ and create a subnet named Subnet1 with the address range $10.0.0.0/26$ . Is the statement 'The maximum number of usable IP addresses for Azure resources in Subnet1 is 59' true or false?

Answer: Answer

Answer

True

The statement is correct because Azure reserves 5 IP addresses in every subnet. A

/26

network contains 64 total addresses, resulting in 59 usable IP addresses.

Step-by-Step Solution

1

Calculate the total number of IP addresses in the subnet CIDR block.

A

/26

CIDR block contains

2^{32 - 26} = 64

total IP addresses.

Determining the total capacity is the starting point for calculating usable addresses.

2

Apply the Azure-specific subnet reservation rule.

Azure reserves 5 IP addresses per subnet: the first four addresses and the last address.

Azure virtual networking requires these reserved IP addresses for internal routing, DNS, and network identity.

3

Subtract the reserved IP addresses from the total number of IP addresses.

64 - 5 = 59

usable IP addresses.

This determines the exact count of IP addresses available for allocation to resources in the subnet.

Key Concept

Azure Subnet Reserved IP Addresses

Estimated Time:45s

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Topics

Create and Configure Virtual Networks and Subnets