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Zorluk: OrtaCreate and Configure Virtual Networks and Subnets

An organization has a virtual network configured with the address space $172.24.0.0/21$ . An administrator needs to create a new subnet named `snet-appdev` to deploy exactly $28$ virtual machine instances. The administrator proposes assigning the address prefix $172.24.2.0/27$ to the new subnet. Does the proposed address prefix provide a sufficient number of usable IP addresses for the virtual machine instances?

Cevap: Cevap

Cevap

No, the proposed address prefix does not provide a sufficient number of usable IP addresses.

The correct response is false because a

/27

subnet provides

32

total IP addresses. Azure reserves

5

IP addresses in each subnet (the first four and the last one). This leaves

27

usable IP addresses (

32 - 5 = 27

). Since

28

virtual machine instances need to be deployed, the subnet is too small.

Adım Adım Çözüm

1

Determine the total number of IP addresses in the proposed subnet prefix.

A

/27

subnet prefix contains

2^{32-27} = 32

total IP addresses.

To calculate the base pool of IP addresses before reservations.

2

Subtract the Azure-reserved IP addresses from the total.

There are

32 - 5 = 27

usable IP addresses.

Azure reserves the first four IP addresses and the last IP address of every subnet for internal services, routing, and DNS.

3

Compare the usable IP addresses with the required host count.

The subnet provides

27

usable IP addresses, which is less than the required

28

virtual machines.

To verify if the proposed range satisfies the host deployment constraints.

Anahtar Kavram

Azure-specific subnet constraints including the five reserved IP addresses.

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Konular

Create and Configure Virtual Networks and Subnets