Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
Exhibit
Hub VNet: - DNS server VM: 10.50.0.4 Spoke VNet: - Default DNS setting: Azure-provided Observed behavior: - VM in spoke can ping hub VM by IP address - nslookup app01.corp.local returns NXDOMAIN
Based on the exhibit, what configuration should the administrator change so VMs in the spoke can resolve internal names from the hub?
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
Add a route table entry that points to the hub DNS server.
Route tables direct packets, but they do not control name resolution for DNS queries.
B
Best answer
Set the spoke VNet custom DNS server to 10.50.0.4.
The spoke is still using Azure-provided DNS, which cannot resolve the hub's internal records. Pointing the spoke VNet to the hub DNS server lets its VMs query the same internal namespace and resolve names correctly.
C
Distractor review
Enable a service endpoint for Microsoft.Storage on the spoke subnet.
Service endpoints help private access to supported Azure services, but they do not change DNS behavior for internal host names.
D
Distractor review
Create a private endpoint for the spoke VM subnet.
Private endpoints give a private IP to a PaaS service, not to normal VM-to-VM name resolution inside a hub network.
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: Set the spoke VNet custom DNS server to 10.50.0.4. — Because the spoke VNet is still using Azure-provided DNS, it has no way to resolve the internal hostnames hosted on the hub DNS server. Setting the spoke VNet’s custom DNS server to 10.50.0.4 makes the spoke VMs send queries to the hub resolver. That is the correct fix for internal name resolution in this design. Why others are wrong: A route table cannot fix DNS. Service endpoints are unrelated to name resolution. A private endpoint is for Azure PaaS services, not for pointing VM clients at an internal DNS server. The issue shown is DNS configuration, not connectivity.
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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