Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A backend VM belongs to AppASG and listens on TCP 8443. The subnet NSG has a deny rule at priority 200 that blocks TCP 8443 from VirtualNetwork to any destination. The backend VM's NIC NSG has an allow rule at priority 100 for TCP 8443 from WebASG to AppASG. Web VMs in WebASG still cannot connect. What should you change to allow only the web tier while keeping other virtual network traffic blocked?
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
Move the NIC NSG allow rule to priority 50.
That still does not overcome the subnet-level deny rule that is evaluated first.
B
Best answer
Add an allow rule in the subnet NSG at priority 150 for TCP 8443 from WebASG to AppASG.
This places a more specific allow ahead of the subnet deny, so only the intended tier is permitted.
C
Distractor review
Replace the subnet deny rule with a rule for the AzureLoadBalancer service tag.
AzureLoadBalancer is for load balancer probes, not for restricting east-west application traffic.
D
Distractor review
Remove the backend VM from AppASG and allow traffic by subnet only.
That does not solve the priority conflict and reduces rule precision and manageability.
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.
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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: Add an allow rule in the subnet NSG at priority 150 for TCP 8443 from WebASG to AppASG. — The subnet NSG deny rule is evaluated before the NIC NSG allow rule because the subnet rule is both higher in the effective path and explicitly denies the flow. To permit only the web tier, you need a more specific allow rule in the subnet NSG with a priority lower than 200. Using WebASG as the source and AppASG as the destination keeps the rule tightly scoped while preserving the broader deny for all other virtual network traffic. Why others are wrong: Changing only the NIC rule does not help because the subnet deny still wins. Replacing the deny with AzureLoadBalancer changes the security intent and does not address app traffic. Removing the backend from AppASG weakens targeting and still leaves the rule precedence problem unresolved. The required fix is to place a specific allow ahead of the existing subnet deny.
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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