- A
10.11.0.0/16
Correct because this range does not overlap with the existing hub or on-premises address spaces.
- B
10.10.128.0/17
Why wrong: False because this range falls inside the hub's 10.10.0.0/16 address space and would overlap.
- C
192.168.50.0/24
Correct because this private range is separate from both existing 10.10.0.0/16 and 10.20.0.0/16 spaces.
- D
10.20.1.0/24
Why wrong: False because this range is contained within the on-premises 10.20.0.0/16 network and overlaps.
- E
10.10.1.0/24
Why wrong: False because this range overlaps the hub network, which already uses the 10.10.0.0/16 space.
Question 529 of 1,170
How to Select a Non-Overlapping Address Space for a New Spoke VNet
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 new spoke virtual network will peer with an existing hub that uses 10.10.0.0/16 and an on-premises network that uses 10.20.0.0/16. Which two address spaces could you assign to the new spoke without overlapping those ranges? Select two.
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
✓
10.11.0.0/16
Option A (10.11.0.0/16) is correct because it is a distinct subnet within the private 10.0.0.0/8 range that does not overlap with the hub's 10.10.0.0/16 or the on-premises 10.20.0.0/16. Azure virtual network peering requires non-overlapping address spaces to enable direct routing between resources without conflict.
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.
- ✓
10.11.0.0/16
Why this is correct
Correct because this range does not overlap with the existing hub or on-premises address spaces.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
10.10.128.0/17
Why it's wrong here
False because this range falls inside the hub's 10.10.0.0/16 address space and would overlap.
When this WOULD be correct
If the hub network used 10.10.0.0/17 instead of /16, then 10.10.128.0/17 would be a non-overlapping adjacent range and could be assigned to the spoke.
- ✓
192.168.50.0/24
Why this is correct
Correct because this private range is separate from both existing 10.10.0.0/16 and 10.20.0.0/16 spaces.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
10.20.1.0/24
Why it's wrong here
False because this range is contained within the on-premises 10.20.0.0/16 network and overlaps.
When this WOULD be correct
This would be correct if the on-premises network used a different range, such as 10.30.0.0/16, and the hub used 10.10.0.0/16, with no overlapping requirements.
- ✗
10.10.1.0/24
Why it's wrong here
False because this range overlaps the hub network, which already uses the 10.10.0.0/16 space.
When this WOULD be correct
This option would be correct if the hub's address space were 10.20.0.0/16 and the on-premises network were 10.10.0.0/16, and the question asked for a non-overlapping address space that is within the same major network as the hub but not overlapping with either.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓10.11.0.0/16Correct answer▾
Why this is correct
Correct because this range does not overlap with the existing hub or on-premises address spaces.
✗10.10.128.0/17Wrong answer — click to see why▾
Why this is wrong here
Option B (10.10.128.0/17) is a subnet of the hub's 10.10.0.0/16, causing an IP address overlap when peering.
★ When this WOULD be the correct answer
If the hub network used 10.10.0.0/17 instead of /16, then 10.10.128.0/17 would be a non-overlapping adjacent range and could be assigned to the spoke.
Why candidates choose this
Candidates may think that using a different subnet mask (e.g., /17) avoids overlap, but they overlook that the range is still contained within the hub's larger /16.
✗10.20.1.0/24Wrong answer — click to see why▾
Why this is wrong here
The address space 10.20.1.0/24 overlaps with the on-premises network 10.20.0.0/16, causing IP conflicts in the peered environment.
★ When this WOULD be the correct answer
This would be correct if the on-premises network used a different range, such as 10.30.0.0/16, and the hub used 10.10.0.0/16, with no overlapping requirements.
Why candidates choose this
Candidates may think that a smaller subnet (10.20.1.0/24) is a safe subset of the larger on-premises range, but any overlap is disallowed in VNet peering.
✗10.10.1.0/24Wrong answer — click to see why▾
Why this is wrong here
Option E (10.10.1.0/24) overlaps with the hub's address space 10.10.0.0/16, as 10.10.1.0/24 is a subset of 10.10.0.0/16. Overlapping address spaces would cause routing conflicts in a peered network.
★ When this WOULD be the correct answer
This option would be correct if the hub's address space were 10.20.0.0/16 and the on-premises network were 10.10.0.0/16, and the question asked for a non-overlapping address space that is within the same major network as the hub but not overlapping with either.
Why candidates choose this
Candidates may think that using a smaller subnet (10.10.1.0/24) within the same major network (10.10.0.0/16) is acceptable, not realizing that any overlap with the hub's range is prohibited.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume any /16 or /24 within the 10.0.0.0/8 range is safe, but they must check for subnet overlap with both the hub and on-premises networks, not just the hub's primary range.
Detailed technical explanation
How to think about this question
Azure virtual network peering uses the hub-spoke topology where each spoke must have a unique address space to avoid routing conflicts. The hub typically acts as a central connectivity point, often with a VPN gateway or Azure Firewall, and overlapping address spaces would cause asymmetric routing or failure to establish the peering connection. In practice, you must plan address spaces carefully, especially when integrating with on-premises networks via ExpressRoute or S2S VPN, as overlapping ranges can break connectivity entirely.
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.
Visual reference
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: 10.11.0.0/16 — Option A (10.11.0.0/16) is correct because it is a distinct subnet within the private 10.0.0.0/8 range that does not overlap with the hub's 10.10.0.0/16 or the on-premises 10.20.0.0/16. Azure virtual network peering requires non-overlapping address spaces to enable direct routing between resources without conflict.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
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