Explanation
The virtual machine you attach a network interface to and the virtual network you connect it to must exist in the same location, here West US, also referred to as a region.
References:
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-network-interface

Explanation
Azure Import/Export service supports the following of storage accounts:
* Standard General Purpose v2 storage accounts (recommended for most scenarios)
* Blob Storage accounts
* General Purpose v1 storage accounts (both Classic or Azure Resource Manager deployments), Azure Import/Export service supports the following storage types:
* Import supports Azure Blob storage and Azure File storage
* Export supports Azure Blob storage
Reference:
https://docs.microsoft.com/en-us/azure/storage/common/storage-import-export-requirements

You can filter network traffic to and from Azure resources in an Azure virtual network with a network security group. A network security group contains security rules that allow or deny inbound network traffic to, or outbound network traffic from, several types of Azure resources.
A network security group contains security rules that allow or deny inbound network traffic to, or outbound network traffic from, several types of Azure resources.
Step A: Create a network security group
A1. Search for and select the resource group for the VM, choose Add, then search for and select Network security group.
A2. Select Create.

The Create network security group window opens.
A3. Create a network security group
Enter a name for your network security group.
Select or create a resource group, then select a location.
A4. Select Create to create the network security group.
Step B: Create an inbound security rule to allows HTTPS over TCP port 443 B1. Select your new network security group.
B2. Select Inbound security rules, then select Add.
B3. Add inbound rule
B4. Select Advanced.
From the drop-down menu, select HTTPS.
You can also verify by clicking Custom and selecting TCP port, and 443.
B5. Select Add to create the rule.
Repeat step B2-B5 to deny TCP port 80
B6. Select Inbound security rules, then select Add.
B7. Add inbound rule
B8. Select Advanced.
Clicking Custom and selecting TCP port, and 80.
B9. Select Deny.
Step C: Associate your network security group with a subnet
Your final step is to associate your network security group with a subnet or a specific network interface.
C1. In the Search resources, services, and docs box at the top of the portal, begin typing Web01.
When the Web01 VM appears in the search results, select it.
C2. Under SETTINGS, select Networking. Select Configure the application security groups, select the Security Group you created in Step A, and then select Save, as shown in the following picture:

References:
https://docs.microsoft.com/en-us/azure/virtual-network/tutorial-filter-network-traffic

A Backend Pool configured by IP address has the following limitations:
Standard load balancer only
Reference:
https://docs.microsoft.com/en-us/azure/load-balancer/backend-pool-management You can only attach virtual machines in the same region and that have a standard SKU public IP configuration or no public IP configuration. All IP configurations must be on the same virtual network.

Explanation
Box 1: never
For Subnet 10.2.9.0/24, endpoint (Refer to first endpoint) is not enabled into the storage account shown in the exhibit. Hence there would not be any connectivity to the file shares in storage account. To establish this connection you must have to enable the endpoint.
Box 2: never
After you configure firewall and virtual network settings for your storage account, select Allow trusted Microsoft services to access this storage account as an exception to enable Azure Backup service to access the network restricted storage account. As this required setting is missing , so Azure backup will not be able to take backup of unmanaged disks.

Reference:
https://docs.microsoft.com/en-us/azure/storage/common/storage-private-endpoints
https://azure.microsoft.com/en-us/blog/azure-backup-now-supports-storage-accounts-secured-with-azurestorage-firewalls-and-virtual-networks/