The answer is 10.42.0.0/23. This address space is the best choice because it provides 512 total IP addresses (510 usable), which comfortably accommodates the 180-host workload subnet and 50-host management subnet, while ensuring no overlap with the hub VNet’s 10.40.0.0/16 or the on-premises network’s 10.41.0.0/16. The /23 prefix allows you to split it into two /24 subnets—for example, 10.42.0.0/24 for workload and 10.42.1.0/24 for management—meeting host requirements without wasting address space. On the AZ-104 exam, this tests your ability to choose a VNet address space to avoid overlap with hub and on-premises networks, a common scenario in hybrid connectivity questions. A frequent trap is selecting a /24, which would only support 254 hosts total, insufficient for both subnets; remember that a /23 doubles your capacity while staying within the same 10.x.x.x range. Memory tip: think “23 for two /24s” to avoid overlap and host shortages.
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 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.
✗
10.41.64.0/18
Why it's wrong here
This falls inside the on-premises range and would create an address overlap later.
✓
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.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
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.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
medium
A.Use the proposed address space because the spoke subnet is smaller than the hub address space.
✓ B.Choose a non-overlapping address space for the spoke, such as 10.61.1.0/24.
C.Create a private endpoint in the spoke to separate its routing table from the hub.
D.Enable gateway transit on the hub peering before creating the spoke.
Why B: 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.
Last reviewed: Jun 11, 2026
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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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