Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A subnet contains several application servers. You need to allow inbound TCP 3389 only from a management subnet named Subnet-Mgmt and deny RDP from all other sources. What should you do?
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
Create an NSG rule allowing TCP 3389 from the Subnet-Mgmt address range and rely on the default deny afterward.
This is the correct way to permit RDP from a specific source while denying other sources.
B
Distractor review
Create a route table that sends RDP traffic to the management subnet.
Route tables do not implement port-based access control.
C
Distractor review
Deploy a private endpoint for each application server.
Private endpoints are for Azure PaaS services, not exposing VM RDP selectively.
D
Distractor review
Enable service endpoints on the application subnet.
Service endpoints are unrelated to RDP access control.
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
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Question 2
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Question 3
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Question 4
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Question 5
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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: Create an NSG rule allowing TCP 3389 from the Subnet-Mgmt address range and rely on the default deny afterward. — An NSG inbound allow rule scoped to the management subnet source range and destination TCP 3389 provides the required access, and lower-priority default deny rules handle the rest. Route tables and service endpoints do not control port-level inbound access.
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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