Troubleshooting Microsoft Azure Connectivity AZ-720 Exam Questions with Experts Answers Updated Recently

Box 1: Configure service endpoint for subnet on VNet2 and VNet3. 

This is what you should do to resolve issues accessing contosostorage1 from VNet2 and VNet3. A service endpoint is a feature that enables you to secure your Azure Storage account to a specific virtual network subnet1.

As mentioned in the scenario, contosostorage1 is a storage account that has firewall and virtual network settings enabled. This means that only requests from allowed networks can access the storage account2. By default, storage accounts accept connections from clients on any network, but you can configure firewall rules to allow or deny access based on the source IP address or virtual network subnet2.

In this scenario, you want to allow access to contosostorage1 from VNet2 and VNet3, which are peered with VNet1. To do this, you need to configure service endpoints for the subnets on VNet2 and VNet3 that need to access the storage account1. A service endpoint is a feature that enables you to secure your Azure Storage account to a specific virtual network subnet1. When you enable a service endpoint for a subnet, you can then grant access to the storage account only from that subnet1. This way, you can restrict access to your storage account and improve network performance by routing traffic through an optimal path.

To configure service endpoints for a subnet using the Azure portal, follow these steps1:

• In the Azure portal, navigate to the Virtual Network resource.
• Select Subnets, then select the subnet that needs to access the storage account.
• Under Service endpoints, select Microsoft.Storage from the drop-down list.
• Select Save to apply the changes.

To configure service endpoints for a subnet using the Azure CLI or PowerShell, see Enable a service endpoint.

After configuring service endpoints for the subnets on VNet2 and VNet3, you also need to grant access to contosostorage1 from those subnets. To do this, you need to modify the firewall rules on the storage account2.

To modify the firewall rules on the storage account using the Azure portal, follow these steps2:

• In the Azure portal, navigate to the Storage Account resource.
• Select Firewalls and virtual networks under Settings.
• Under Allow access from selected networks, select Add existing virtual network.
• Select the virtual network and subnet that have service endpoints enabled for Microsoft.Storage.
• Select Add to save the changes.

To modify the firewall rules on the storage account using the Azure CLI or PowerShell, see Configure Azure Storage firewalls and virtual networks.

Box 2: Configure the firewall settings on contosostorage1.

The issue reported is that on-premises connections to contosostorage1 are unsuccessful. The main reason for this could be that the firewall settings on the storage account are blocking the connections. By configuring the firewall settings on contosostorage1 to allow the on-premises IP addresses, you can ensure that the on-premises connections are successful.

As mentioned in the scenario, contosostorage1 is a storage account that has firewall and virtual network settings enabled. This means that only requests from allowed networks can access the storage account1. By default, storage accounts accept connections from clients on any network, but you can configure firewall rules to allow or deny access based on the source IP address or virtual network subnet1.

In this scenario, you want to allow access to contosostorage1 from the on-premises environment, which is connected to Azure using a Site-to-Site VPN connection. A Site-to-Site VPN connection lets you create a secure connection between your on-premises network and an Azure virtual network over an IPsec/IKE VPN tunnel2. To allow access to contosostorage1 from the on-premises environment, you need to configure the firewall settings on contosostorage1 to include the public IP address of your VPN device or gateway3.

To configure the firewall settings on contosostorage1 using the Azure portal, follow these steps1:

• In the Azure portal, navigate to the Storage Account resource.
• Select Firewalls and virtual networks under Settings.
• Under Allow access from selected networks, select Add existing virtual network.
• Select VNet1 and the subnet that has service endpoints enabled for Microsoft.Storage.
• Under Firewall, enter the public IP address of your VPN device or gateway under Address Range.
• Select Save to apply the changes.

To configure the firewall settings on contosostorage1 using the Azure CLI or PowerShell, see Configure Azure Storage firewalls and virtual networks.

Box 1: Enable access to Azure Resource Manager for template deployment.

In the given scenario, you are trying to resolve Azure VM deployment issues. To configure an Azure Key Vault access policy setting for VM deployment, you need to enable access to Azure Resource Manager for template deployment. This will allow the VM deployment process to access the secrets and certificates stored in the Key Vault during the deployment of the VM using an ARM (Azure Resource Manager) template. Reference: - https://docs.microsoft.com/en-us/azure/key-vault/general/tutorial-net-create-vault-azure-web-app

BoX 2: Grant the Microsoft.KeyVault/vaults/deploy/action permission

 This is the permission that you should configure on an RBAC Key Vault role to resolve the Azure virtual machine (VM) deployment issues. This permission allows Azure Resource Manager to retrieve secrets from the key vault when deploying resources using an ARM template1. Therefore, option C is correct.

A detailed explanation with references is as follows:

As mentioned in the scenario, the Azure virtual machine (VM) deployment issues are caused by the inability of Azure Resource Manager to retrieve secrets from the key vault when deploying resources using an ARM template. To resolve this issue, you need to configure an RBAC Key Vault role that grants Azure Resource Manager the permission to access the key vault.

RBAC Key Vault roles are roles that can be assigned to users, groups, or applications to manage access to key vault secrets, keys, and certificates2. RBAC Key Vault roles are based on Azure role-based access control (Azure RBAC), which is an authorization system that provides fine-grained access management of Azure resources3. With Azure RBAC, you can control access to resources by creating role assignments, which consist of three elements3:

• The security principal: The user, group, or application that you want to grant or deny access to the resource.
• The role definition: The predefined or custom set of permissions that you want to grant or deny on the resource. For example, read, write, delete, backup, restore, etc.
• The scope: The level at which you want to apply the role assignment. For example, at the management group, subscription, resource group, or individual resource level.

To configure a role assignment that allows Azure Resource Manager to retrieve secrets from the key vault when deploying resources using an ARM template, you need to grant the Microsoft.KeyVault/vaults/deploy/action permission1. This is a special permission that grants Azure Resource Manager a limited permission to get secrets from the key vault during resource deployment1. This permission does not grant any other permissions to Azure Resource Manager on the key vault or its contents1.

To grant the Microsoft.KeyVault/vaults/deploy/action permission using the Azure portal, follow these steps1:

• In the Azure portal, navigate to the Key Vault resource.
• Select Access control (IAM), then select Add > Add role assignment.
• Under Role, select a built-in or custom role that includes the Microsoft.KeyVault/vaults/deploy/action permission. For example, you can select Key Vault Administrator or Key Vault Secrets User.
• Under Assign access to, select Azure AD user, group, or service principal.
• Under Select, enter Azure Resource Manager in the search field and select it.
• Select Save to create the role assignment.

To grant the Microsoft.KeyVault/vaults/deploy/action permission using the Azure CLI or PowerShell, see Grant permissions for template deployment.

Box 1: Verify that VNet1 is configured to use the built-in Azure resolution

As mentioned in the scenario, you need to troubleshoot and resolve the reverse DNS lookup issues. Reverse DNS lookup is a process of resolving an IP address to a host name2. For example, if you have a virtual machine with an IP address of 10.0.0.4 and a host name of vm1.contoso.com, you can use reverse DNS lookup to find the host name from the IP address.

One way to perform reverse DNS lookup in Azure is to use the built-in Azure resolution. The built-in Azure resolution is a feature that allows reverse DNS lookup (PTR DNS queries) for virtual machine IP addresses by default1. This feature works for both IPv4 and IPv6 addresses, and it supports both public and private IP addresses. The built-in Azure resolution uses the host name of the virtual machine as the reverse DNS record.

To use the built-in Azure resolution, you need to configure your virtual network to use the default Azure-provided DNS servers. These are the DNS servers that are automatically assigned to your virtual network when you create it3. You can verify or change the DNS server settings of your virtual network using the Azure portal, PowerShell, CLI, or REST API.

To verify that VNet1 is configured to use the built-in Azure resolution using the Azure portal, follow these steps:

• In the Azure portal, navigate to the Virtual Network resource.
• Select DNS servers under Settings.
• Check if Default (Azure-provided) is selected under DNS servers. If not, select it and click Save to apply the changes.

After configuring your virtual network to use the built-in Azure resolution, you can test the reverse DNS lookup using tools such as nslookup or dig. For example, you can use the following command to perform a reverse DNS lookup for an IP address of 10.0.0.4:

nslookup -type=PTR 10.0.0.4

The output should show the host name of the virtual machine that has that IP address.

Box 2: Create an in-addr.arpa private DNS zone and link it to VNet1, VNet2, and VNet3.

Reverse DNS lookup issues are related to resolving IP addresses to their corresponding hostnames. In the given scenario, the issue is with reverse DNS lookups for the resources in the three virtual networks. Creating an in-addr.arpa private DNS zone and linking it to VNet1, VNet2, and VNet3 would ensure that the reverse DNS lookups can be resolved correctly across all three virtual networks. Reference: 1. Azure Private DNS: https://docs.microsoft.com/en-us/azure/dns/private-dns-overview 2. Reverse DNS lookup in Azure: https://docs.microsoft.com/en-us/azure/dns/private-dns-reverse-public-ip