- A
Use the proposed address space because the spoke subnet is smaller than the hub address space.
Why wrong: A smaller subnet does not avoid overlap. The spoke range still falls inside the hub's 10.60.0.0/16 space, which prevents peering.
- B
Choose a non-overlapping address space for the spoke, such as 10.61.1.0/24.
VNet peering requires non-overlapping address spaces. Because 10.60.1.0/24 is contained inside the hub's 10.60.0.0/16 range, the spoke cannot be safely peered as proposed. The correct fix is to pick a different CIDR block that does not overlap with the hub or any other connected network, such as 10.61.1.0/24.
- C
Create a private endpoint in the spoke to separate its routing table from the hub.
Why wrong: Private endpoints are for private access to supported Azure services and do not solve overlapping VNet address planning issues.
- D
Enable gateway transit on the hub peering before creating the spoke.
Why wrong: Gateway transit is unrelated to overlapping IP ranges. The peering itself cannot be established correctly until the address spaces do not overlap.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 team is creating a new spoke VNet that will later be peered to an existing hub VNet and connected to on-premises networks. The proposed address space for the spoke is 10.60.1.0/24. The hub already uses 10.60.0.0/16. What should the administrator do before deploying the spoke?
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, such as 10.61.1.0/24.
Option B is correct because VNet address spaces must not overlap when peered or connected via VPN/ExpressRoute. The proposed spoke address 10.60.1.0/24 falls within the hub's 10.60.0.0/16 range, creating an overlap that would prevent successful peering and routing. A non-overlapping address space like 10.61.1.0/24 ensures unique IP ranges, allowing proper route propagation and connectivity.
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.
- ✗
Use the proposed address space because the spoke subnet is smaller than the hub address space.
Why it's wrong here
A smaller subnet does not avoid overlap. The spoke range still falls inside the hub's 10.60.0.0/16 space, which prevents peering.
- ✓
Choose a non-overlapping address space for the spoke, such as 10.61.1.0/24.
Why this is correct
VNet peering requires non-overlapping address spaces. Because 10.60.1.0/24 is contained inside the hub's 10.60.0.0/16 range, the spoke cannot be safely peered as proposed. The correct fix is to pick a different CIDR block that does not overlap with the hub or any other connected network, such as 10.61.1.0/24.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a private endpoint in the spoke to separate its routing table from the hub.
Why it's wrong here
Private endpoints are for private access to supported Azure services and do not solve overlapping VNet address planning issues.
- ✗
Enable gateway transit on the hub peering before creating the spoke.
Why it's wrong here
Gateway transit is unrelated to overlapping IP ranges. The peering itself cannot be established correctly until the address spaces do not overlap.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly think a smaller subnet within a larger address space is acceptable for VNet peering, but Azure requires completely non-overlapping address spaces to avoid routing ambiguity.
Detailed technical explanation
How to think about this question
Azure VNet peering uses the address space of each VNet to create system routes; overlapping ranges cause routing conflicts where Azure cannot determine which VNet should receive traffic for the overlapping IPs. Even if the spoke uses a subnet within the hub's larger range, the hub's route table already owns the entire /16, so traffic to 10.60.1.0/24 would stay local to the hub and never reach the spoke. In hybrid scenarios with ExpressRoute or VPN, overlapping address spaces also break BGP route propagation, leading to connectivity failures.
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.
What to study next
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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, such as 10.61.1.0/24. — Option B is correct because VNet address spaces must not overlap when peered or connected via VPN/ExpressRoute. The proposed spoke address 10.60.1.0/24 falls within the hub's 10.60.0.0/16 range, creating an overlap that would prevent successful peering and routing. A non-overlapping address space like 10.61.1.0/24 ensures unique IP ranges, allowing proper route propagation and connectivity.
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
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