- A
Add another inbound allow rule for TCP 443 from the repository address.
Why wrong: The connection is initiated from the VM, so an inbound rule on the subnet does not resolve the blocked outbound traffic.
- B
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
Change the inbound allow rule to priority 50.
Why wrong: 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
Remove the VM's public IP address.
Why wrong: 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.
Quick Answer
The answer is to add an outbound allow rule for TCP 443 to the Internet or the repository service tag. This is correct because the NSG outbound deny rule blocking downloads is the direct cause of the failure; the VM’s outbound traffic is denied by the custom outbound priority 100 rule, which overrides the default allow rules. Inbound rules, such as the existing allow for TCP 443 from the Internet, only control traffic entering the subnet and have no effect on outbound connections, so the HTTPS download requests never leave the VM. On the AZ-104 exam, this scenario tests your understanding of NSG rule evaluation order and the critical distinction between inbound and outbound security rules—a common trap is assuming an inbound allow rule automatically permits the corresponding outbound response. Remember the memory tip: “Outbound is for leaving, inbound is for receiving; a deny outbound stops all sending, even if inbound is forgiving.”
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Add an outbound allow rule for TCP 443 to Internet or the repository service tag.
The VM's outbound traffic is blocked by the default outbound deny rule (priority 100). Since the app needs to download updates from an HTTPS repository (TCP 443), an outbound allow rule for TCP 443 to the Internet or the repository service tag is required. Inbound rules do not affect outbound traffic, so the existing inbound allow rule is irrelevant to the download failure.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add another inbound allow rule for TCP 443 from the repository address.
Why it's wrong here
The connection is initiated from the VM, so an inbound rule on the subnet does not resolve the blocked outbound traffic.
- ✓
Add an outbound allow rule for TCP 443 to Internet or the repository service tag.
Why this is correct
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Change the inbound allow rule to priority 50.
Why it's wrong here
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.
- ✗
Remove the VM's public IP address.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on inbound rules because the NSG has an inbound allow rule, but the real issue is that outbound traffic is explicitly denied, and they forget that NSGs are stateful only for traffic that matches an allow rule, not for all traffic.
Detailed technical explanation
How to think about this question
Network Security Groups (NSGs) are stateful: if you allow inbound traffic, the corresponding outbound response is automatically allowed, but this does not apply to outbound-initiated traffic. For outbound connections initiated by the VM, you must explicitly allow the outbound traffic. The default outbound deny rule (priority 65000) is overridden by custom rules, but here a custom outbound deny rule (priority 100) blocks all outbound traffic, so a higher-priority outbound allow rule for TCP 443 is necessary. In real-world scenarios, service tags like 'Internet' or 'AzureCloud' can simplify rule management for outbound access to specific Azure services.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
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 VM's outbound traffic is blocked by the default outbound deny rule (priority 100). Since the app needs to download updates from an HTTPS repository (TCP 443), an outbound allow rule for TCP 443 to the Internet or the repository service tag is required. Inbound rules do not affect outbound traffic, so the existing inbound allow rule is irrelevant to the download failure.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.
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