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Question

Difficulty: EasyCreate and Configure Virtual Networks and Subnets

In an Azure virtual network, a subnet configured with the address prefix 10.0.0.0/2910.0.0.0/29 has exactly three usable IP addresses available for resource allocation.

Answer: Answer

Answer

The statement is true because a /29/29 subnet contains 88 total IP addresses, and Azure's standard reservation of 55 IP addresses leaves exactly 33 usable IP addresses.
The statement is true because a /29/29 subnet has 88 total IP addresses, and subtracting the 55 addresses Azure reserves leaves exactly 33 usable addresses.

Step-by-Step Solution

1
Calculate the total number of IP addresses in a /29/29 prefix.
The total number of IP addresses is 232−29=23=82^{32-29} = 2^3 = 8.
Prefix length of 2929 leaves 33 bits for host addresses (32−29=332 - 29 = 3).
2
Identify the number of IP addresses reserved by Azure in each subnet.
Azure reserves exactly 55 IP addresses in every subnet.
Azure reserves the first four IP addresses and the last IP address for networking and service functionality.
3
Subtract the reserved IP addresses from the total IP addresses to find the usable count.
Usable IP addresses = 8−5=38 - 5 = 3.
This determines the remaining addresses available for virtual machines and other resources.

Key Concept

Azure Subnet IP Address Reservation
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Topics

Create and Configure Virtual Networks and Subnets