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Zorluk: KolayCreate and Configure Virtual Networks and Subnets

An administrator configures a subnet in Microsoft Azure with the address block 172.16.5.0/29172.16.5.0/29. Is it true or false that this subnet has exactly 3 usable IP addresses available for virtual machines?

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The statement is true because a /29/29 subnet has 88 total IP addresses, and Azure reserves 55 of them, leaving 33 usable IP addresses.
The statement is correct because a /29/29 subnet provides 88 total IP addresses. Since Azure reserves 55 IP addresses per subnet, the number of usable IP addresses is 8−5=38 - 5 = 3.

Adım Adım Çözüm

1
Calculate the total number of IP addresses in a /29/29 subnet.
A /29/29 subnet has 232−29=23=82^{32-29} = 2^3 = 8 total IP addresses.
To determine usable IP addresses, first find the total address space size.
2
Subtract the Azure-reserved IP addresses.
8−5=38 - 5 = 3 usable IP addresses.
Azure reserves the first four IP addresses and the last IP address of every subnet for internal services, totaling 55 reserved IPs.

Anahtar Kavram

Azure Subnet IP Address Reservation
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Create and Configure Virtual Networks and Subnets