Your company has an Azure subscription containing a virtual network named `VNet1` (172.16.… — Microsoft Azure Administrator (AZ-104)

Your company has an Azure subscription containing a virtual network named `VNet1` ( $172.16.0.0/16$ ). `VNet1` contains a subnet named `AKS-Subnet` ( $172.16.1.0/24$ ). You plan to deploy an Azure Kubernetes Service (AKS) cluster named `aks-prod` into `AKS-Subnet`. The cluster configuration must satisfy the following requirements:
- The cluster must start with $3$ nodes and support scaling up to $8$ nodes.
- Each node must run up to $28$ pods.
- Pods must be assigned IP addresses directly from `AKS-Subnet` to allow direct routing without NAT to an on-premises network connected via ExpressRoute.
- You must prevent IP address allocation failures in the subnet during scaling.

Which configuration should you select to deploy the cluster?

A
Deploy the cluster using the Azure CNI network model and use the default maximum pods per node setting.
Deploy the cluster using the Azure CNI network model and set the maximum pods per node to 28.Cevap
C
Deploy the cluster using the Kubenet network model and set the maximum pods per node to 28.
D
Deploy the cluster using the Azure CNI network model with dynamic IP allocation to a new /29 pod subnet.

Cevap

Deploy the cluster using the Azure CNI network model and set the maximum pods per node to 28.

Deploying the cluster using Azure CNI and configuring the maximum pods per node to 28 ensures that pods get routable IP addresses directly from the subnet (meeting the no-NAT requirement) while keeping the total IP allocation to 237, which is within the 251 usable IP addresses in the /24 subnet.

Adım Adım Çözüm

Calculate the number of usable IP addresses in the subnet.

/24

subnet has

256

total IP addresses. Since Azure reserves

5

IP addresses, the number of usable IP addresses is

256 - 5 = 251

This establishes the upper bound of IP addresses available for the entire AKS cluster deployment (nodes and pods).

Evaluate the IP requirements for the Azure CNI network model at maximum scale.

The formula for IP allocation in Azure CNI is:

\text{Total IPs Required} = \text{Nodes} + (\text{Nodes} \times \text{Max Pods Per Node}) + 5

. For

8

nodes and

28

pods per node, the required IPs are:

8 + (8 \times 28) + 5 = 8 + 224 + 5 = 237

IP addresses.

To verify if the subnet can support the maximum scale-out scenario of

8

nodes with

28

pods each.

Compare the required IP addresses against the usable IP addresses.

Since

237 \leq 251

, the configuration fits within the subnet. If the default setting of

30

pods per node were used, the requirement would be

8 + (8 \times 30) + 5 = 253

IP addresses, exceeding the available space.

To determine the exact configuration parameter needed to prevent deployment and scaling failures.

Anahtar Kavram

Azure CNI IP Address Planning

Tahmini Süre:2m 30s

Soru

Cevap

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