The answer is IP flow verify. This Network Watcher tool is the correct choice because it performs a precise traffic test by evaluating a specific source and destination IP, port, and protocol—such as TCP 1433—against the effective network security group (NSG) rules. It then reports whether the traffic is allowed or denied and, crucially, identifies the exact NSG rule name and priority responsible for that decision, which is exactly what the scenario requires. On the AZ-104 exam, this question tests your ability to differentiate between Network Watcher tools: IP flow verify is for point-in-time rule analysis on a single traffic flow, while NSG diagnostics or topology tools serve broader purposes. A common trap is confusing it with NSG flow logs, which analyze historical traffic patterns rather than testing a specific flow. Memory tip: think of IP flow verify as a "traffic lie detector" for a single packet—it tells you yes or no, and points the finger at the specific rule.
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.
Exhibit
Troubleshooting notes:
- Source VM: vm-app01
- Destination VM: vm-sql01
- Port: TCP 1433
- Symptom: Connection times out
- Goal: Verify whether the packet is allowed or denied by NSG rules and identify the rule name
- Need a point-in-time check from the VM NIC perspective
Based on the exhibit, which Network Watcher tool should you use to determine whether an NSG allows or denies TCP 1433 traffic and which rule is responsible?
Troubleshooting notes:
- Source VM: vm-app01
- Destination VM: vm-sql01
- Port: TCP 1433
- Symptom: Connection times out
- Goal: Verify whether the packet is allowed or denied by NSG rules and identify the rule name
- Need a point-in-time check from the VM NIC perspective
A
IP flow verify
IP flow verify is built to test a specific source, destination, protocol, and port against NSG rules.
B
Connection troubleshoot
Why wrong: Connection troubleshoot checks end-to-end connectivity, but it is less focused on rule-level allow and deny decisions.
C
Packet capture
Why wrong: Packet capture records packets for later analysis, but it does not directly identify the matching NSG rule.
D
Next hop
Why wrong: Next hop shows routing decisions, not whether an NSG permits or blocks a TCP flow.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IP flow verify
IP flow verify tests a specific source/destination IP, port, and protocol (TCP 1433) against the effective NSG rules to report whether traffic is allowed or denied, and it identifies the exact NSG rule (name and priority) responsible for that decision. This makes it the correct tool for determining NSG rule impact on a specific traffic flow.
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.
✓
IP flow verify
Why this is correct
IP flow verify is built to test a specific source, destination, protocol, and port against NSG rules.
Related concept
Read the scenario before looking for a memorised answer.
✗
Connection troubleshoot
Why it's wrong here
Connection troubleshoot checks end-to-end connectivity, but it is less focused on rule-level allow and deny decisions.
✗
Packet capture
Why it's wrong here
Packet capture records packets for later analysis, but it does not directly identify the matching NSG rule.
✗
Next hop
Why it's wrong here
Next hop shows routing decisions, not whether an NSG permits or blocks a TCP flow.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'Connection troubleshoot' (which tests end-to-end connectivity) with 'IP flow verify' (which specifically tests NSG rule evaluation), leading them to pick B because they think connectivity checks include rule analysis.
Trap categories for this question
Command / output trap
Next hop shows routing decisions, not whether an NSG permits or blocks a TCP flow.
Detailed technical explanation
How to think about this question
IP flow verify works by simulating a packet with the given 5-tuple (source IP, destination IP, source port, destination port, protocol) and evaluating it against the effective security rules of the target NIC/subnet. It returns the result (Allowed/Denied) and the specific NSG rule (e.g., 'DenyAllInBound' with priority 65000) that triggered the verdict, including whether the rule is inbound or outbound. This is particularly useful for troubleshooting SQL Server connectivity (TCP 1433) when complex NSG rule hierarchies exist.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
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: IP flow verify — IP flow verify tests a specific source/destination IP, port, and protocol (TCP 1433) against the effective NSG rules to report whether traffic is allowed or denied, and it identifies the exact NSG rule (name and priority) responsible for that decision. This makes it the correct tool for determining NSG rule impact on a specific traffic flow.
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.
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