Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company already uses the address space 10.20.0.0/16 for a hub virtual network and 10.21.0.0/16 on-premises. A new spoke virtual network will be peered to the hub and may later connect to the on-premises network. Which address space should the administrator choose for the spoke to avoid future routing conflicts?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
10.20.64.0/19
This range still falls inside the hub VNet address space, so it would overlap immediately.
B
Distractor review
10.21.0.0/16
This range conflicts with the existing on-premises network, which would complicate peering and routing.
C
Best answer
10.22.0.0/16
This range does not overlap with either the hub VNet or the on-premises network. It also provides a full /16, which leaves enough room for multiple subnets and future growth while keeping peering and hybrid connectivity straightforward.
D
Distractor review
10.20.128.0/17
This prefix is also within the hub VNet range, so it would overlap with the existing address space.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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Question 4
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Question 5
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Question 6
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FAQ
Questions learners often ask
What does this AZ-104 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: 10.22.0.0/16 — Azure peering and hybrid routing depend on unique, non-overlapping address spaces. Because the hub already uses 10.20.0.0/16 and on-premises already uses 10.21.0.0/16, the spoke must use a different range. 10.22.0.0/16 is safely outside both existing networks and is large enough to support several subnets, which makes it a practical choice for future expansion. Why others are wrong: A and D overlap with the hub VNet, so they are unusable for a peered spoke. B overlaps the on-premises network, which would create ambiguous routing once hybrid connectivity is introduced. The right design choice is to select a completely separate RFC 1918 range before deployment.
What should I do if I get this AZ-104 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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