Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
Exhibit
VNet-A address space: 10.0.0.0/16 VNet-B address space: 10.0.1.0/24 Attempt to peer VNet-A and VNet-B: Status: Failed Error: Address space overlap detected Requirement: Both VNets must remain connected, but the address spaces must not overlap.
Based on the exhibit, what is the best change so the VNet peering can be created successfully?
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
Best answer
Change VNet-B to a non-overlapping address space, such as 10.1.0.0/24.
Azure VNet peering requires that the address spaces do not overlap. Changing VNet-B to a different range removes the conflict and allows peering to be created. The exact new range can vary, but it must not overlap with VNet-A’s 10.0.0.0/16 range.
B
Distractor review
Add a route table to VNet-B before creating the peering.
Route tables do not resolve overlapping address spaces. The peering fails before any routing behavior matters.
C
Distractor review
Enable gateway transit on VNet-A.
Gateway transit is used to share a VPN or ExpressRoute gateway through peering. It does not fix overlapping CIDR blocks.
D
Distractor review
Resize VNet-A to 10.0.0.0/15 so both VNets fit.
Making the larger range would actually expand overlap instead of removing it. Peering still cannot be established when address spaces overlap.
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.
Question 1
A route table contains these entries: 10.0.0.0/8 with next hop Virtual appliance, and 10.1.1.0/24 with next hop Virtual network gateway. Which next hop will Azure use for traffic to 10.1.1.5?
Question 2
You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?
Question 3
You are deploying a Windows Server VM for an internal app. The VM must support Secure Boot and vTPM later, its OS disk must survive host moves, and the team wants the lowest-cost managed disk tier that still behaves like a normal writable OS disk. Which two choices should you make? Select two.
Question 4
You need to deploy several identical virtual machines and ensure that the failure of a single Azure host does not affect all of them. Which feature should you use?
Question 5
You need to connect VNet-Hub and VNet-Spoke so that resources in both virtual networks can communicate privately over the Microsoft backbone. Both virtual networks are in the same region. What should you configure?
Question 6
You need to create a storage account that provides the lowest-cost redundant storage for non-critical data and only needs protection against local disk or server failure within a single datacenter. Which redundancy option should you choose?
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: Change VNet-B to a non-overlapping address space, such as 10.1.0.0/24. — The exhibit shows an overlap between 10.0.0.0/16 and 10.0.1.0/24, which is not allowed for VNet peering. The fix is to move one VNet to a different, non-overlapping address range. In practice, administrators choose a new CIDR block that does not conflict with existing networks, then recreate the peering. Why others are wrong: A route table, gateway transit, or resizing the larger VNet does not remove the overlap. Peering is blocked by the IP plan itself, so the network range must be corrected first. This is an address planning problem, not a routing or gateway problem.
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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