Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Exhibit
Subnet NSG inbound rules: Priority 100 Deny-RDP-All Source: Any Destination: Any Protocol: TCP Port: 3389 Priority 200 Allow-RDP-Admin Source: 192.168.10.0/24 Destination: Any Protocol: TCP Port: 3389 Priority 65000 AllowVNetInBound Source: VirtualNetwork Destination: VirtualNetwork Protocol: Any Port: * Client IP: 192.168.10.25 Symptom: RDP times out before the logon prompt appears.
Based on the exhibit, a help desk engineer cannot RDP from an approved admin subnet to a VM in Azure. What change should the administrator make so the connection is allowed?
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
Change the deny rule to use UDP instead of TCP.
RDP uses TCP 3389 for the primary connection. Changing the deny rule protocol to UDP does not permit the required TCP traffic and would not solve the timeout.
B
Best answer
Move Allow-RDP-Admin to a priority lower than 100.
NSG rules are processed in priority order, and the lowest number wins. Because the deny rule at priority 100 matches first, the allow rule at 200 never takes effect. Moving the allow rule to a smaller number than 100 lets the approved subnet match the permit rule before the deny rule is evaluated.
C
Distractor review
Add the VM NIC to an application security group and leave the rules unchanged.
Application security groups help target rules, but they do not override an earlier deny rule. The priority conflict still blocks RDP even if the VM is in an ASG.
D
Distractor review
Delete the default AllowVNetInBound rule.
The default allow rule is not the reason the approved subnet is blocked. Removing it would reduce connectivity further and would not fix the higher-priority deny rule.
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
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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: Move Allow-RDP-Admin to a priority lower than 100. — The exhibit shows a deny rule for TCP 3389 at priority 100 and an allow rule for the approved admin subnet at priority 200. Azure evaluates NSG rules from the lowest priority number to the highest, so the deny rule wins and blocks RDP before the allow rule is considered. The correct fix is to give the allow rule a higher precedence than the deny rule by moving it to a lower number than 100. Why others are wrong: Changing TCP to UDP does not help because the connection needs TCP 3389. ASGs can scope rules, but they cannot bypass a higher-priority deny entry. Deleting the default allow rule would not resolve the issue and would likely make troubleshooting harder by removing broader virtual network 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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