Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Exhibit
VNet-Prod address space: 10.40.0.0/16 VNet-Shared address space: 10.40.128.0/17 Operation result: Create peering failed Error: Address space overlap detected between the selected virtual networks.
Based on the exhibit, an administrator is trying to peer two VNets so workloads can communicate privately. The peering creation fails. What should the administrator do first?
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
Create a user-defined route in VNet-Prod to force traffic through a firewall.
A route table does not resolve overlapping IP ranges between virtual networks. The peering operation fails before routing is even relevant.
B
Best answer
Readdress one of the VNets so the address spaces no longer overlap.
Azure VNet peering requires non-overlapping address spaces. The correct first step is to change one VNet to a unique, non-conflicting prefix before attempting peering again. Once the overlap is removed, the peering can be created and traffic can flow privately between the networks.
C
Distractor review
Enable gateway transit on both VNets and retry the peering.
Gateway transit helps with on-premises connectivity through a gateway, but it does not solve overlapping CIDR ranges. The peering still cannot be created while address spaces conflict.
D
Distractor review
Add an NSG rule that allows traffic from the other VNet.
NSG rules control filtering after connectivity exists. They cannot overcome a hard peering requirement such as overlapping address spaces, so the peering failure remains.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Readdress one of the VNets so the address spaces no longer overlap. — Azure VNet peering only works when the address spaces of the two VNets do not overlap. In the exhibit, both VNets contain 10.40.128.0/17 within the broader 10.40.0.0/16 range, so Azure rejects the peering request. The administrator must readdress one network to a non-overlapping prefix, then recreate the peering. That is the prerequisite before any gateway or firewall settings matter. Why others are wrong: A route table only affects how packets are forwarded after connectivity exists; it cannot fix address overlap. Gateway transit is for sharing a VPN or ExpressRoute gateway, not for overlapping prefixes. NSG rules are evaluated only after traffic can already traverse the network path, so they do not address the peering validation failure.
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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