- A
Effective routes, because it shows the exact NSG rule name for blocked traffic.
Why wrong: Effective routes shows the routing table applied to a NIC, not the specific NSG rule that permits or denies a flow.
- B
IP flow verify, because it evaluates the 5-tuple and reports the matching allow or deny rule.
IP flow verify is designed to test a specific source, destination, protocol, and port combination against NSG rules. It returns whether the flow is allowed or denied and identifies the rule that matched, which makes it the right tool when you need to prove whether TCP 1433 is blocked and why.
- C
Packet capture, because it automatically tells you which NSG rule denied the traffic.
Why wrong: Packet capture records packets for later inspection, but it does not directly evaluate NSG policy or identify the matching rule name.
- D
Connection troubleshoot, because it only checks DNS name resolution.
Why wrong: Connection troubleshoot can test end-to-end reachability, but it is not the most precise tool for identifying the exact NSG rule that allows or denies the traffic flow.
Using IP Flow Verify to Find the Exact NSG Rule Blocking Traffic
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 VM named VM1 cannot establish TCP 1433 connectivity to VM2. The administrator wants to test the exact flow, confirm whether an NSG allows or denies it, and identify the rule that applies if the flow is blocked. Which Network Watcher tool should be used?
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
IP flow verify, because it evaluates the 5-tuple and reports the matching allow or deny rule.
IP flow verify is the correct tool because it evaluates the 5-tuple (source IP, destination IP, source port, destination port, and protocol) against the effective Network Security Group (NSG) rules for a given virtual machine network interface. It explicitly reports whether the traffic is allowed or denied and, if denied, identifies the exact NSG rule (name and priority) that caused the denial. This directly meets the administrator's requirement to test the exact flow and identify the blocking rule.
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.
- ✗
Effective routes, because it shows the exact NSG rule name for blocked traffic.
Why it's wrong here
Effective routes shows the routing table applied to a NIC, not the specific NSG rule that permits or denies a flow.
When this WOULD be correct
When the question asks to verify the next hop or the route taken by traffic from a VM to a destination, such as checking if traffic goes through a virtual appliance or is routed to the internet.
- ✓
IP flow verify, because it evaluates the 5-tuple and reports the matching allow or deny rule.
Why this is correct
IP flow verify is designed to test a specific source, destination, protocol, and port combination against NSG rules. It returns whether the flow is allowed or denied and identifies the rule that matched, which makes it the right tool when you need to prove whether TCP 1433 is blocked and why.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Packet capture, because it automatically tells you which NSG rule denied the traffic.
Why it's wrong here
Packet capture records packets for later inspection, but it does not directly evaluate NSG policy or identify the matching rule name.
When this WOULD be correct
When the question asks to capture and analyze the actual network packets between two VMs to diagnose a connectivity issue, such as verifying if packets are being dropped or inspecting application-level data.
- ✗
Connection troubleshoot, because it only checks DNS name resolution.
Why it's wrong here
Connection troubleshoot can test end-to-end reachability, but it is not the most precise tool for identifying the exact NSG rule that allows or denies the traffic flow.
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.
✓IP flow verify, because it evaluates the 5-tuple and reports the matching allow or deny rule.Correct answer▾
Why this is correct
IP flow verify is designed to test a specific source, destination, protocol, and port combination against NSG rules. It returns whether the flow is allowed or denied and identifies the rule that matched, which makes it the right tool when you need to prove whether TCP 1433 is blocked and why.
✗Effective routes, because it shows the exact NSG rule name for blocked traffic.Wrong answer — click to see why▾
Why this is wrong here
Effective routes show the effective route table for a VM, not NSG rules. They cannot identify the specific NSG rule that allows or denies traffic based on a 5-tuple.
★ When this WOULD be the correct answer
When the question asks to verify the next hop or the route taken by traffic from a VM to a destination, such as checking if traffic goes through a virtual appliance or is routed to the internet.
Why candidates choose this
Candidates may confuse 'effective routes' with 'effective security rules' or think that route tables include NSG information, leading them to believe it can show NSG rule names.
✗Packet capture, because it automatically tells you which NSG rule denied the traffic.Wrong answer — click to see why▾
Why this is wrong here
Packet capture does not automatically identify which NSG rule denied traffic; it only captures raw network packets, requiring manual analysis to infer blocking.
★ When this WOULD be the correct answer
When the question asks to capture and analyze the actual network packets between two VMs to diagnose a connectivity issue, such as verifying if packets are being dropped or inspecting application-level data.
Why candidates choose this
Candidates may think packet capture provides direct insight into NSG decisions because it captures all traffic, but it lacks the rule-level evaluation that IP flow verify offers.
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 confuse 'Connection troubleshoot' (which tests end-to-end connectivity and can indicate a block) with 'IP flow verify' (which explicitly identifies the exact NSG rule name that caused the denial), leading them to choose the less precise tool.
Trap categories for this question
Command / output trap
Effective routes shows the routing table applied to a NIC, not the specific NSG rule that permits or denies a flow.
Detailed technical explanation
How to think about this question
IP flow verify works by simulating the traffic flow using the Azure Resource Manager's network security rule evaluation engine, which processes the 5-tuple against all applied NSG rules (including application security groups and service tags) in priority order. It returns the effective rule (allow or deny) and, for deny, the exact rule name and priority, which is critical for troubleshooting complex multi-tier applications where overlapping NSG rules can cause unexpected blocks. In real-world scenarios, this tool is essential when an administrator suspects a specific NSG rule is blocking SQL Server traffic (TCP 1433) but needs to confirm which rule among hundreds is responsible.
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
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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: IP flow verify, because it evaluates the 5-tuple and reports the matching allow or deny rule. — IP flow verify is the correct tool because it evaluates the 5-tuple (source IP, destination IP, source port, destination port, and protocol) against the effective Network Security Group (NSG) rules for a given virtual machine network interface. It explicitly reports whether the traffic is allowed or denied and, if denied, identifies the exact NSG rule (name and priority) that caused the denial. This directly meets the administrator's requirement to test the exact flow and identify the blocking rule.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
2 more ways this is tested on AZ-104
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A VM in a subnet cannot connect to another VM on TCP 1433. The administrator wants to confirm whether an NSG rule is blocking the flow and which rule is responsible. Which Network Watcher feature should be used?
medium- A.Connection troubleshoot
- ✓ B.IP flow verify
- C.Packet capture
- D.Effective routes
Why B: B is correct because IP flow verify is the Network Watcher feature specifically designed to test whether traffic is allowed or denied to or from a virtual machine. It checks the security rules (NSG and ASG) and returns which rule is blocking the flow, including the direction and priority. For a TCP 1433 connection failure, this tool directly identifies the blocking NSG rule.
Variation 2. A VM cannot connect to another VM on TCP 1433. You need to determine whether an NSG is blocking the flow and identify which rule applies. Which Network Watcher tool should you use?
medium- A.Packet capture
- ✓ B.IP flow verify
- C.Connection troubleshoot
- D.Effective routes
Why B: IP flow verify is the correct Network Watcher tool because it tests whether a packet is allowed or denied to or from a specific VM, based on a 5-tuple (source IP, destination IP, protocol, source port, destination port). For TCP 1433 (SQL Server), you can specify the exact flow parameters, and IP flow verify will evaluate all effective security rules, including NSG rules, and return the specific rule that allowed or denied the traffic.
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Last reviewed: Jun 11, 2026
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