Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
An NSG outbound rule allows TCP 8443 traffic from ASG-Web to ASG-Api. The web VM NIC is in ASG-Web, but the API VM NICs were deployed into the correct subnet and never added to ASG-Api. The traffic still fails. What should the administrator 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
Distractor review
Move the NSG to the web subnet so source membership is automatically detected.
NSG location does not change ASG membership; the destination VM still must belong to the destination ASG.
B
Best answer
Add the API VM NICs to ASG-Api.
ASG-based NSG rules match the actual NIC memberships, so the destination VMs must be in ASG-Api.
C
Distractor review
Change the destination port to 443 because ASGs only work with common HTTPS traffic.
ASGs support many ports; the problem is missing ASG membership, not the chosen port.
D
Distractor review
Create a service endpoint for the spoke subnet so the NSG rule becomes effective.
Service endpoints are for PaaS service access and do not activate ASG-based security rules.
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 the API VM NICs to ASG-Api. — Application security groups are referenced in NSG rules, but the rule only works when the source and destination NICs actually belong to the specified ASGs. In this case, the web NICs are in ASG-Web, but the API NICs were never added to ASG-Api, so the destination match never occurs. Adding the API NICs to the correct ASG is the required fix, provided the rule priority and direction are also correct. Why others are wrong: Moving the NSG does not substitute for missing ASG membership. Port 8443 is valid; the issue is not the protocol. Service endpoints are unrelated to NSG rule evaluation and cannot make an ASG-based rule work if the destination NICs are not in the correct group.
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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