Question 1mediummulti select
Full question →mediummulti selectObjective-mapped
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
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
Best answer
A dedicated GatewaySubnet must exist in the VNet.
Azure requires a specific GatewaySubnet for the virtual network gateway resources and routing components.
B
Best answer
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
Distractor review
The VNet must already contain a private endpoint for on-premises connectivity.
Private endpoints are for PaaS access from Azure, not for establishing VPN tunnels from on-premises.
D
Distractor review
A network security group must be attached to the GatewaySubnet.
An NSG is not a prerequisite for deployment, and adding one can even complicate gateway traffic.
E
Distractor review
The VNet must use a service endpoint for Microsoft.Network.
Service endpoints are unrelated to VPN gateway provisioning and tunnel establishment.
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
A route table contains these entries: 10.0.0.0/8 with next hop Virtual appliance, and 10.1.1.0/24 with next hop Virtual network gateway. Which next hop will Azure use for traffic to 10.1.1.5?
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: A dedicated GatewaySubnet must exist in the VNet. — A site-to-site VPN gateway needs a dedicated GatewaySubnet because Azure deploys the gateway components there and manages their addressing separately from application subnets. It also needs a public IP resource so the on-premises VPN device has a reachable public endpoint for the encrypted tunnel. Without those prerequisites, gateway deployment validation fails or the gateway cannot accept connections from the on-premises device. Why others are wrong: Private endpoints and service endpoints are PaaS access features, not VPN prerequisites. An NSG on GatewaySubnet is not required for deployment and can interfere if misconfigured. The gateway's public IP and the dedicated subnet are the critical deployment requirements here.
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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