- A
A dedicated GatewaySubnet must exist in the VNet.
Azure requires a specific GatewaySubnet for the virtual network gateway resources and routing components.
- B
The gateway must have a public IP address resource assigned to it.
The on-premises VPN device needs a public endpoint to connect to the Azure VPN gateway.
- C
The VNet must already contain a private endpoint for on-premises connectivity.
Why wrong: Private endpoints are for PaaS access from Azure, not for establishing VPN tunnels from on-premises.
- D
A network security group must be attached to the GatewaySubnet.
Why wrong: An NSG is not a prerequisite for deployment, and adding one can even complicate gateway traffic.
- E
The VNet must use a service endpoint for Microsoft.Network.
Why wrong: Service endpoints are unrelated to VPN gateway provisioning and tunnel establishment.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An administrator is preparing an Azure site-to-site VPN gateway deployment for an existing VNet. Which two prerequisites must be in place for the gateway to deploy successfully? Select two.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A dedicated GatewaySubnet must exist in the VNet.
Option A is correct because a dedicated GatewaySubnet is a mandatory requirement for deploying any Azure VPN gateway. This subnet must be named 'GatewaySubnet' and must have a minimum address prefix of /29 (though /27 is recommended) to accommodate the gateway VMs and future scaling. Without this subnet, the gateway creation will fail as Azure uses it to host the gateway VMs and route traffic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A dedicated GatewaySubnet must exist in the VNet.
Why this is correct
Azure requires a specific GatewaySubnet for the virtual network gateway resources and routing components.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The gateway must have a public IP address resource assigned to it.
- ✗
The VNet must already contain a private endpoint for on-premises connectivity.
- ✗
A network security group must be attached to the GatewaySubnet.
Why it's wrong here
An NSG is not a prerequisite for deployment, and adding one can even complicate gateway traffic.
- ✗
The VNet must use a service endpoint for Microsoft.Network.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the GatewaySubnet requirement with optional components like NSGs or service endpoints, or mistakenly think a private endpoint is needed for on-premises connectivity, when in fact the two mandatory prerequisites are the GatewaySubnet and a public IP address resource.
Detailed technical explanation
How to think about this question
The GatewaySubnet must be created with a specific name and size to host the gateway VMs, which run as a pair in an active/standby configuration. The subnet must not contain any other resources, and its address space must be within the VNet's address range but not overlap with other subnets. In production, a /27 subnet is recommended to allow for future gateway SKU upgrades and maintenance without requiring a new subnet.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A dedicated GatewaySubnet must exist in the VNet. — Option A is correct because a dedicated GatewaySubnet is a mandatory requirement for deploying any Azure VPN gateway. This subnet must be named 'GatewaySubnet' and must have a minimum address prefix of /29 (though /27 is recommended) to accommodate the gateway VMs and future scaling. Without this subnet, the gateway creation will fail as Azure uses it to host the gateway VMs and route traffic.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
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