- A
Reuse 10.50.0.0/16 in the spoke so routing to the hub is simpler.
Why wrong: 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
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
Create a route table first so peering can learn the spoke routes.
Why wrong: 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
Enable a service endpoint to allow the spoke to communicate with the hub.
Why wrong: 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.
Quick Answer
The correct answer is to choose a non-overlapping address space for the spoke and reserve room for future subnets. Azure VNet peering requires non-overlapping address spaces because the peering connection establishes a direct routing path between the two virtual networks; if the hub and spoke share any IP ranges, Azure’s routing tables become ambiguous, leading to traffic black-holing or peering failure. On the AZ-104 exam, this concept tests your understanding of how Azure handles transitive routing and address conflicts, often appearing in hub-and-spoke topology questions where a VPN gateway is involved. A common trap is assuming that overlapping addresses can be resolved with route tables—they cannot, because peering itself enforces strict non-overlap at the VNet level. Remember the memory tip: “No overlap, no collapse”—if your IP ranges collide, your peering will not glide.
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.
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
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Choose a non-overlapping address space for the spoke and reserve room for future subnets.
Option B is correct because Azure VNet peering requires non-overlapping address spaces to establish connectivity. If the spoke uses the same address space as the hub (10.50.0.0/16), routing conflicts will occur, and the peering will fail or cause unpredictable traffic behavior. Additionally, reserving room for future subnets ensures the spoke can scale without needing to re-architect the 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.
- ✗
Reuse 10.50.0.0/16 in the spoke so routing to the hub is simpler.
Why it's wrong here
Reusing the same address space creates overlap and prevents peering from working correctly. Azure VNets that are peered must have non-overlapping IP ranges.
- ✓
Choose a non-overlapping address space for the spoke and reserve room for future subnets.
Why this is correct
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a route table first so peering can learn the spoke routes.
Why it's wrong here
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.
- ✗
Enable a service endpoint to allow the spoke to communicate with the hub.
Why it's wrong here
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 traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think reusing the same address space simplifies routing (Option A), but Azure explicitly forbids overlapping address spaces for VNet peering, making non-overlapping address planning the critical first step.
Detailed technical explanation
How to think about this question
Azure VNet peering uses the Azure backbone to route traffic between VNets, relying on the system routes generated from each VNet's address space. If address spaces overlap, Azure cannot create unique routes, leading to ambiguous routing and potential packet drops. A real-world scenario is when a hub VNet uses 10.50.0.0/16 and a spoke uses 10.50.0.0/24; the peering will fail with an error about overlapping address spaces, requiring the spoke to be redeployed with a non-overlapping range like 10.51.0.0/16.
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: Choose a non-overlapping address space for the spoke and reserve room for future subnets. — Option B is correct because Azure VNet peering requires non-overlapping address spaces to establish connectivity. If the spoke uses the same address space as the hub (10.50.0.0/16), routing conflicts will occur, and the peering will fail or cause unpredictable traffic behavior. Additionally, reserving room for future subnets ensures the spoke can scale without needing to re-architect the 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.
About these practice questions
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Last reviewed: Jun 11, 2026
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.
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