Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company is building a hub-and-spoke Azure network. The hub VNet already uses 10.50.0.0/16. A new spoke VNet will later be peered to the hub and connected to on-premises through VPN. What is the most important planning step before creating the peering?
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
Reuse 10.50.0.0/16 in the spoke so routing to the hub is simpler.
Reusing the same address space creates overlap and prevents peering from working correctly. Azure VNets that are peered must have non-overlapping IP ranges.
B
Best answer
Choose a non-overlapping address space for the spoke and reserve room for future subnets.
A spoke VNet must not overlap with the hub or any other connected network. Reserving space for future subnets is also good planning because it reduces redesign later when the environment grows.
C
Distractor review
Create a route table first so peering can learn the spoke routes.
Route tables do not solve overlapping IP ranges, and peering does not depend on a route table being created first. Address planning comes before route design.
D
Distractor review
Enable a service endpoint to allow the spoke to communicate with the hub.
Service endpoints are for secure access to supported Azure services, not for VNet-to-VNet peering. They do not replace the need for a unique, non-overlapping address range.
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: Choose a non-overlapping address space for the spoke and reserve room for future subnets. — For hub-and-spoke designs, address planning is the first critical step. Azure VNet peering requires each VNet to have a unique, non-overlapping IP space. If the spoke overlaps with the hub or on-premises networks, peering and routing become problematic or impossible. Reserving space for future growth is also important because changing address ranges later can disrupt connected services, DNS, and VPN configuration. Why others are wrong: Reusing the hub range would create an overlap and block a clean network design. Route tables are useful for traffic control, but they do not fix address conflicts. Service endpoints are unrelated to VNet peering and only extend private access to certain Azure PaaS services. None of these choices address the core prerequisite of non-overlapping IP ranges.
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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