- A
The NSG does not allow inbound TCP 3389
An NSG deny or missing allow rule on TCP 3389 will block RDP access.
- B
The storage account uses LRS
Why wrong: Storage redundancy does not affect RDP connectivity to a VM.
- C
Azure Advisor is not enabled
Why wrong: Azure Advisor provides recommendations and does not gate VM connectivity.
- D
The VM is in an availability set
Why wrong: Being in an availability set does not prevent Remote Desktop access.
Question 816 of 1,170
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 Windows VM in Azure has a public IP address, but administrators on the internet cannot connect by using Remote Desktop. You confirm that the VM is running and the guest firewall allows RDP. What is the most likely Azure-side cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
The NSG does not allow inbound TCP 3389
The most likely Azure-side cause is that a Network Security Group (NSG) associated with the VM's subnet or network interface is blocking inbound traffic on TCP port 3389 (RDP). Even if the VM is running and the guest OS firewall allows RDP, an NSG rule must explicitly permit inbound TCP 3389 from the internet (or a specific source) for Remote Desktop connections to succeed. Without such a rule, the NSG silently drops the packets before they reach the VM.
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.
- ✓
The NSG does not allow inbound TCP 3389
Why this is correct
An NSG deny or missing allow rule on TCP 3389 will block RDP access.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The storage account uses LRS
Why it's wrong here
Storage redundancy does not affect RDP connectivity to a VM.
When this WOULD be correct
A question asks: 'Which storage replication option provides the lowest cost while protecting against server rack failures?' LRS would be correct because it replicates data within a single datacenter, offering resilience against local hardware failures at minimal cost.
- ✗
Azure Advisor is not enabled
Why it's wrong here
Azure Advisor provides recommendations and does not gate VM connectivity.
- ✗
The VM is in an availability set
Why it's wrong here
Being in an availability set does not prevent Remote Desktop access.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓The NSG does not allow inbound TCP 3389Correct answer▾
Why this is correct
An NSG deny or missing allow rule on TCP 3389 will block RDP access.
✗The storage account uses LRSWrong answer — click to see why▾
Why this is wrong here
Storage account replication type (LRS) affects data durability and availability, not network connectivity to a VM. It has no impact on RDP access.
★ When this WOULD be the correct answer
A question asks: 'Which storage replication option provides the lowest cost while protecting against server rack failures?' LRS would be correct because it replicates data within a single datacenter, offering resilience against local hardware failures at minimal cost.
Why candidates choose this
Candidates may confuse storage replication with high availability features, thinking LRS might cause connectivity issues due to lack of redundancy, but storage and network are separate concerns.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the guest OS firewall is the only barrier for RDP, overlooking that Azure's NSG acts as a separate, mandatory network-level filter that must explicitly allow inbound TCP 3389 from the internet.
Detailed technical explanation
How to think about this question
NSGs are stateful firewalls that filter traffic at the subnet or NIC level using priority-ordered rules. By default, an NSG denies all inbound traffic unless an explicit allow rule exists. For RDP from the internet, you need a rule with source 'Any' or 'Internet', destination port '3389', protocol 'TCP', and action 'Allow'. A common subtlety is that the NSG's default deny rule (rule 65000) will block RDP if no higher-priority allow rule is present, even if the VM's guest firewall is configured correctly.
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Visual reference
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: The NSG does not allow inbound TCP 3389 — The most likely Azure-side cause is that a Network Security Group (NSG) associated with the VM's subnet or network interface is blocking inbound traffic on TCP port 3389 (RDP). Even if the VM is running and the guest OS firewall allows RDP, an NSG rule must explicitly permit inbound TCP 3389 from the internet (or a specific source) for Remote Desktop connections to succeed. Without such a rule, the NSG silently drops the packets before they reach the VM.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
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