- A
10.40.128.0/17
Why wrong: This overlaps the existing hub address space, which would block peering and future routing.
- B
10.41.64.0/18
Why wrong: This falls inside the on-premises range and would create an address overlap later.
- C
10.42.0.0/23
This avoids overlap and provides enough space to split into one /24 and one smaller subnet cleanly.
- D
10.42.0.0/24
Why wrong: A /24 is too small to comfortably host both subnet requirements within the same address space.
Question 1,086 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. 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.
Your hub virtual network uses 10.40.0.0/16 and the corporate on-premises network uses 10.41.0.0/16. A new spoke VNet must be peered to the hub now and connected to on-premises later. It needs a workload subnet for about 180 hosts and a management subnet for about 50 hosts. Which address space is the best choice for the new spoke?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
✓
10.42.0.0/23
Option C (10.42.0.0/23) is correct because it provides 512 total IP addresses (510 usable), which is sufficient for the 180-host workload subnet and 50-host management subnet, while avoiding overlap with both the hub VNet (10.40.0.0/16) and the on-premises network (10.41.0.0/16). The /23 prefix allows splitting into two /24 subnets (e.g., 10.42.0.0/24 for workload and 10.42.1.0/24 for management), meeting the host requirements without wasting address space.
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.
- ✗
10.40.128.0/17
Why it's wrong here
This overlaps the existing hub address space, which would block peering and future routing.
When this WOULD be correct
This option would be correct if the question asked for a subnet within the hub VNet (e.g., for a new workload subnet in the hub) and the hub's address space was 10.40.0.0/16, allowing 10.40.128.0/17 as a valid subnet.
- ✗
10.41.64.0/18
Why it's wrong here
This falls inside the on-premises range and would create an address overlap later.
When this WOULD be correct
This option would be correct if the on-premises network used a different address range (e.g., 10.40.0.0/16) and the hub VNet used 10.41.0.0/16, and the spoke needed a large address space (16,382 hosts) for future growth.
- ✓
10.42.0.0/23
Why this is correct
This avoids overlap and provides enough space to split into one /24 and one smaller subnet cleanly.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
10.42.0.0/24
Why it's wrong here
A /24 is too small to comfortably host both subnet requirements within the same address space.
When this WOULD be correct
This option would be correct if the question required a single subnet for a small workload (e.g., 100 hosts) and no management subnet, or if the spoke only needed a /24 for a specific purpose like a gateway subnet or a small application tier.
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.
✓10.42.0.0/23Correct answer▾
Why this is correct
This avoids overlap and provides enough space to split into one /24 and one smaller subnet cleanly.
✗10.40.128.0/17Wrong answer — click to see why▾
Why this is wrong here
Option A (10.40.128.0/17) overlaps with the hub VNet's 10.40.0.0/16 address space, causing peering conflict and routing issues.
★ 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., for a new workload subnet in the hub) and the hub's address space was 10.40.0.0/16, allowing 10.40.128.0/17 as a valid subnet.
Why candidates choose this
Candidates may think a larger /17 subnet is better for future growth, but they overlook the requirement to avoid overlapping with the hub's address space.
✗10.41.64.0/18Wrong answer — click to see why▾
Why this is wrong here
Option B (10.41.64.0/18) overlaps with the corporate on-premises network (10.41.0.0/16), which would cause routing conflicts when the spoke is later connected to on-premises.
★ When this WOULD be the correct answer
This option would be correct if the on-premises network used a different address range (e.g., 10.40.0.0/16) and the hub VNet used 10.41.0.0/16, and the spoke needed a large address space (16,382 hosts) for future growth.
Why candidates choose this
Candidates may think a larger subnet is better for future growth, or they might mistakenly believe that using a different /18 within the same /16 as the hub is acceptable without considering on-premises overlap.
✗10.42.0.0/24Wrong answer — click to see why▾
Why this is wrong here
Option D (10.42.0.0/24) provides only 254 addresses total, but the spoke needs at least 180 + 50 = 230 hosts, plus overhead for Azure reserved addresses (5 per subnet), so a /24 is insufficient for both subnets. Additionally, a /24 cannot be subdivided into two subnets of the required sizes without overlapping or running out of addresses.
★ When this WOULD be the correct answer
This option would be correct if the question required a single subnet for a small workload (e.g., 100 hosts) and no management subnet, or if the spoke only needed a /24 for a specific purpose like a gateway subnet or a small application tier.
Why candidates choose this
Candidates often see 10.42.0.0/24 as a clean, non-overlapping range that avoids the hub (10.40.0.0/16) and on-premises (10.41.0.0/16) addresses, but they overlook the total host count requirement and the need for two subnets.
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 choose a /24 (Option D) thinking it is sufficient for 230 hosts, forgetting that Azure reserves 5 IPs per subnet and that two separate subnets are needed, making the /24 too small for both workload and management subnets combined.
Detailed technical explanation
How to think about this question
Azure reserves the first four and last IP addresses in each subnet (e.g., .0, .1, .2, .3, and .255 for a /24), so a /24 yields only 251 usable addresses. When planning spoke VNet address spaces, you must consider future connectivity: hub-and-spoke topologies with on-premises via gateway transit require the spoke to use an address range that does not overlap with any peered VNet or the on-premises network, as Azure does not support overlapping address spaces in VNet peering or VPN gateways. The /23 prefix (512 total IPs, 510 usable) is the smallest that comfortably fits both subnets while avoiding overlap.
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: 10.42.0.0/23 — Option C (10.42.0.0/23) is correct because it provides 512 total IP addresses (510 usable), which is sufficient for the 180-host workload subnet and 50-host management subnet, while avoiding overlap with both the hub VNet (10.40.0.0/16) and the on-premises network (10.41.0.0/16). The /23 prefix allows splitting into two /24 subnets (e.g., 10.42.0.0/24 for workload and 10.42.1.0/24 for management), meeting the host requirements without wasting address space.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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