AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 deploying an Azure VPN gateway for a site-to-site connection. The deployment fails because required network resources are missing. Which configuration is required before the gateway can be created?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A subnet named GatewaySubnet and a public IP address for the VPN gateway.
A VPNgateway in Azure requires a dedicated subnet named 'GatewaySubnet' to host the gateway instances, and a public IP address resource must be allocated to the gateway to establish the site-to-site VPN tunnel over the internet. Without these two prerequisites, the deployment will fail because the gateway cannot be provisioned or addressed externally.
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 subnet named GatewaySubnet and a public IP address for the VPN gateway.
Why this is correct
Azure VPN gateways require a dedicated GatewaySubnet and a public IP for external reachability.
Related concept
Read the scenario before looking for a memorised answer.
✗
A subnet named AzureBastionSubnet and a static private IP address.
Why it's wrong here
That subnet is used by Bastion, not by a VPNgateway deployment.
✗
A network security group attached directly to the virtual network gateway.
Why it's wrong here
VPN gateways are not configured by attaching NSGs directly to the gateway resource.
✗
A load balancer with a public frontend to terminate the VPN connection.
Why it's wrong here
Azure VPN gateways do not rely on a load balancer for tunnel termination.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the required subnet name 'GatewaySubnet' with other special subnets like 'AzureBastionSubnet' or 'AzureFirewallSubnet', leading them to select an incorrect option that seems plausible but serves a different purpose.
Detailed technical explanation
How to think about this question
The GatewaySubnet must have a minimum address prefix of /29 (though /27 is recommended for future scaling) and cannot be renamed or shared with other resources. The public IP address assigned to the VPNgateway must be in the 'Basic' SKU for gateway types that do not support 'Standard' SKU, and it must be allocated using a dynamic assignment method for the gateway to function correctly. In a real-world scenario, forgetting to create the GatewaySubnet or using an incorrect subnet name is a common cause of deployment failures, as Azure validates the subnet name at provisioning time.
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
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
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 subnet named GatewaySubnet and a public IP address for the VPN gateway. — A VPN gateway in Azure requires a dedicated subnet named 'GatewaySubnet' to host the gateway instances, and a public IP address resource must be allocated to the gateway to establish the site-to-site VPN tunnel over the internet. Without these two prerequisites, the deployment will fail because the gateway cannot be provisioned or addressed externally.
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.
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Question Discussion
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