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 a site-to-site VPN gateway in Azure. Which resource must be attached to the gateway so it can receive encrypted connections from the on-premises VPN device?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A public IP address resource.
A site-to-site VPNgateway in Azure requires a public IP address resource to be attached so that the on-premises VPN device can establish an encrypted IPsec/IKE tunnel to it. The public IP address provides the routable endpoint on the internet that the on-premises device connects to, and it is assigned to the gateway's front-end configuration. Without this public IP, the gateway cannot receive inbound encrypted traffic from the external network.
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 public IP address resource.
Why this is correct
The VPNgateway needs a public-facing IP address so the on-premises VPN device can establish the encrypted tunnel.
Related concept
Read the scenario before looking for a memorised answer.
✗
A private endpoint.
Why it's wrong here
Private endpoints are for private access to PaaS services, not for VPNgateway tunnel termination.
✗
A service endpoint.
Why it's wrong here
Service endpoints are for subnet access to Azure services and do not provide a VPNgateway address.
✗
A network security group.
Why it's wrong here
NSGs filter traffic, but they do not supply the public-facing endpoint needed for VPN connectivity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse a VPNgateway's public IP requirement with private connectivity options like private endpoints or service endpoints, mistakenly thinking the gateway can operate within the virtual network's private IP space alone.
Detailed technical explanation
How to think about this question
Under the hood, the Azure VPNgateway uses a 'gateway subnet' and the attached public IP address to establish an IPsec tunnel using IKEv1 or IKEv2 with pre-shared keys or certificates. The public IP address must be of the 'Basic' or 'Standard' SKU and is assigned to the gateway's front-end IP configuration; it cannot be changed after creation without recreating the gateway. In a real-world scenario, if you deploy a VPN gateway without a public IP, the gateway will fail to provision because the underlying Azure platform requires a public endpoint for the IPsec negotiation.
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 public IP address resource. — A site-to-site VPN gateway in Azure requires a public IP address resource to be attached so that the on-premises VPN device can establish an encrypted IPsec/IKE tunnel to it. The public IP address provides the routable endpoint on the internet that the on-premises device connects to, and it is assigned to the gateway's front-end configuration. Without this public IP, the gateway cannot receive inbound encrypted traffic from the external network.
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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