Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A VM subnet has an NSG with these custom rules: - Inbound priority 100: Allow TCP 443 from Internet - Outbound priority 100: Deny Any to Internet The VM hosts an app that must download updates from an HTTPS repository on the Internet. The downloads fail. What change should be made?
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 another inbound allow rule for TCP 443 from the repository address.
The connection is initiated from the VM, so an inbound rule on the subnet does not resolve the blocked outbound traffic.
B
Best answer
Add an outbound allow rule for TCP 443 to Internet or the repository service tag.
The VM is initiating outbound HTTPS sessions, so the outbound direction must permit TCP 443. Because a deny-all outbound rule is blocking traffic to Internet, the fix is to add a higher-priority outbound allow rule that matches the repository destination, such as Internet or a specific service tag. Inbound HTTPS rules do not help traffic leaving the VM.
C
Distractor review
Change the inbound allow rule to priority 50.
Changing an inbound rule priority does not affect outbound traffic. The failure is caused by the outbound deny rule, so inbound priority adjustments are unrelated.
D
Distractor review
Remove the VM's public IP address.
Removing a public IP does not fix an outbound NSG deny. The VM still needs an outbound allow rule to reach the Internet by TCP 443.
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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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 outbound allow rule for TCP 443 to Internet or the repository service tag. — The update download is an outbound connection from the VM to an Internet repository. NSG rules are direction-specific, so an inbound allow rule for TCP 443 does not permit outbound sessions. The custom outbound deny rule is what blocks the traffic. Adding an outbound allow rule for TCP 443 to the correct destination, such as Internet or a narrower service tag, resolves the issue while keeping the rest of the outbound restrictions intact. Why others are wrong: Inbound rules only control traffic entering the subnet or NIC, so they do not help a VM initiate HTTPS downloads. Priority changes on inbound rules do not change the outbound deny decision. Removing the public IP is unrelated because the problem is caused by the NSG outbound policy, not by the presence of an address on the VM.
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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