Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
An administrator is deploying a site-to-site VPN gateway in Azure. The GatewaySubnet already exists, but the deployment fails because no public-facing address is available for the gateway. What is required for the gateway to deploy and accept the on-premises connection?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Assign a standard Load Balancer to the GatewaySubnet.
A load balancer is not a replacement for the public IP resource required by the VPN gateway.
B
Distractor review
Create a private endpoint for the virtual network gateway.
Private endpoints are used for supported PaaS services, not for exposing VPN gateway termination to on-premises peers.
C
Best answer
Create and associate a public IP address with the VPN gateway.
A site-to-site VPN gateway needs a public IP address so the on-premises VPN device can establish and maintain the tunnel to Azure. The GatewaySubnet is the correct dedicated subnet, but it is not enough by itself. The gateway also requires a public-facing address resource assigned during deployment so it can receive VPN connections from outside Azure.
D
Distractor review
Delegate the GatewaySubnet to Microsoft.Network/privateEndpoints.
Subnet delegation for private endpoints is unrelated to VPN gateway deployment and does not provide tunnel termination.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?
Question 3
You are deploying a Windows Server VM for an internal app. The VM must support Secure Boot and vTPM later, its OS disk must survive host moves, and the team wants the lowest-cost managed disk tier that still behaves like a normal writable OS disk. Which two choices should you make? Select two.
Question 4
You need to deploy several identical virtual machines and ensure that the failure of a single Azure host does not affect all of them. Which feature should you use?
Question 5
You need to connect VNet-Hub and VNet-Spoke so that resources in both virtual networks can communicate privately over the Microsoft backbone. Both virtual networks are in the same region. What should you configure?
Question 6
You need to create a storage account that provides the lowest-cost redundant storage for non-critical data and only needs protection against local disk or server failure within a single datacenter. Which redundancy option should you choose?
FAQ
Questions learners often ask
What does this AZ-104 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Create and associate a public IP address with the VPN gateway. — A site-to-site VPN gateway must have a public IP address because the on-premises VPN device initiates connectivity to that public endpoint. Azure also expects the gateway to be placed in the dedicated GatewaySubnet, but the missing public-facing address is the immediate blocker in this scenario. Creating and associating the public IP allows the gateway to deploy and accept the tunnel. Why others are wrong: A load balancer does not satisfy the VPN gateway's public IP requirement. Private endpoints are for private access to supported services, not for VPN tunnel termination. Subnet delegation to private endpoints is unrelated to VPN gateways and does not solve the deployment validation failure.
What should I do if I get this AZ-104 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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