- A
10.40.64.0/25
Why wrong: This range is too small for 120 endpoints plus future growth, and it is carved from the hub's existing address space.
- B
10.42.0.0/24
This is a non-overlapping private range that is large enough for the current requirement and leaves room for adding more subnets later.
- C
10.41.128.0/24
Why wrong: This would conflict with the on-premises network range and would create routing problems during connectivity setup.
- D
192.168.10.0/26
Why wrong: This is a valid private range, but it is too small for the stated endpoint count and expected growth.
Question 213 of 1,170
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 company is creating a new spoke virtual network that will be peered to an existing hub VNet. The hub uses 10.40.0.0/16, and an on-premises network already uses 10.41.0.0/16. The spoke must support about 120 endpoints now and should allow room for growth. Which address space should you assign to the new spoke VNet?
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
✓
10.42.0.0/24
Option B (10.42.0.0/24) is correct because it provides 256 IP addresses (251 usable) for the spoke, which exceeds the requirement of ~120 endpoints with room for growth, and it does not overlap with the hub VNet (10.40.0.0/16) or the on-premises network (10.41.0.0/16). This ensures successful VNet peering without IP address conflicts.
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.
- ✗
10.40.64.0/25
Why it's wrong here
This range is too small for 120 endpoints plus future growth, and it is carved from the hub's existing address space.
When this WOULD be correct
This option would be correct if the question asked for a subnet within the hub VNet (e.g., 'Which subnet should you create in the hub VNet for a new application tier?') and the hub VNet's address space is 10.40.0.0/16, with no on-premises overlap.
- ✓
10.42.0.0/24
Why this is correct
This is a non-overlapping private range that is large enough for the current requirement and leaves room for adding more subnets later.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
10.41.128.0/24
Why it's wrong here
This would conflict with the on-premises network range and would create routing problems during connectivity setup.
When this WOULD be correct
This option would be correct if the on-premises network used a different address space (e.g., 10.42.0.0/16) and the hub VNet used 10.40.0.0/16, with no overlap, and the spoke needed a /24 subnet for about 120 endpoints with room for growth.
- ✗
192.168.10.0/26
Why it's wrong here
This is a valid private range, but it is too small for the stated endpoint count and expected growth.
When this WOULD be correct
This option would be correct in a scenario where the spoke VNet needs to support fewer than 62 endpoints (e.g., a small test environment) and there is no requirement for future growth, and the hub/on-premises networks use different address spaces that do not overlap with 192.168.10.0/26.
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.
✓10.42.0.0/24Correct answer▾
Why this is correct
This is a non-overlapping private range that is large enough for the current requirement and leaves room for adding more subnets later.
✗10.40.64.0/25Wrong answer — click to see why▾
Why this is wrong here
Option A (10.40.64.0/25) overlaps with the hub VNet's address space 10.40.0.0/16, which would cause a peering conflict. Azure requires non-overlapping address spaces for peered VNets.
★ When this WOULD be the correct answer
This option would be correct if the question asked for a subnet within the hub VNet (e.g., 'Which subnet should you create in the hub VNet for a new application tier?') and the hub VNet's address space is 10.40.0.0/16, with no on-premises overlap.
Why candidates choose this
Candidates may think that using a subset of the hub's address space is acceptable for a spoke, or they may focus on the /25 size being sufficient for 120 endpoints without checking for overlap with the hub.
✗10.41.128.0/24Wrong answer — click to see why▾
Why this is wrong here
Option C (10.41.128.0/24) overlaps with the on-premises network 10.41.0.0/16, which would cause routing conflicts when peered with the hub VNet.
★ When this WOULD be the correct answer
This option would be correct if the on-premises network used a different address space (e.g., 10.42.0.0/16) and the hub VNet used 10.40.0.0/16, with no overlap, and the spoke needed a /24 subnet for about 120 endpoints with room for growth.
Why candidates choose this
Candidates might choose this because it is a /24 subnet (providing 254 addresses) and they overlook the overlap with the on-premises network, focusing only on avoiding conflict with the hub VNet.
✗192.168.10.0/26Wrong answer — click to see why▾
Why this is wrong here
Option D (192.168.10.0/26) provides only 62 usable IP addresses, which is insufficient for the required 120 endpoints plus growth. Additionally, using a private IP range from 192.168.x.x is not necessary and may cause routing conflicts if other networks use that range.
★ When this WOULD be the correct answer
This option would be correct in a scenario where the spoke VNet needs to support fewer than 62 endpoints (e.g., a small test environment) and there is no requirement for future growth, and the hub/on-premises networks use different address spaces that do not overlap with 192.168.10.0/26.
Why candidates choose this
Candidates may choose this because 192.168.x.x is a familiar private IP range often used in small networks, and they might overlook the specific endpoint count requirement or assume a /26 subnet is sufficient without calculating the actual number of usable addresses.
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 overlook the on-premises address space (10.41.0.0/16) and mistakenly choose an overlapping range like 10.41.128.0/24, assuming only the hub VNet's address space must be avoided.
Detailed technical explanation
How to think about this question
VNet peering requires non-overlapping address spaces to enable direct routing between virtual networks; overlapping CIDR blocks cause routing conflicts and peering failures. Azure reserves the first four and last IP addresses in each subnet for protocol operations (e.g., network, gateway, Azure DNS, and broadcast), so a /24 subnet yields 251 usable addresses. In real-world scenarios, choosing a non-overlapping address space like 10.42.0.0/24 also avoids future complications when adding VPN gateways or ExpressRoute circuits that require unique address ranges.
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
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: 10.42.0.0/24 — Option B (10.42.0.0/24) is correct because it provides 256 IP addresses (251 usable) for the spoke, which exceeds the requirement of ~120 endpoints with room for growth, and it does not overlap with the hub VNet (10.40.0.0/16) or the on-premises network (10.41.0.0/16). This ensures successful VNet peering without IP address conflicts.
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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