- A
Connection troubleshoot
Why wrong: Connection troubleshoot checks end-to-end reachability, but it does not specifically identify the exact NSG rule decision as directly as flow verification does.
- B
IP flow verify
IP flow verify is designed to test whether a specific packet would be allowed or denied by the effective NSG rules on a VM NIC. It helps the administrator identify the rule name and direction that controls the flow. That makes it the best choice when the question is specifically about an NSG decision on a given source, destination, protocol, and port.
- C
Packet capture
Why wrong: Packet capture is useful for analyzing traffic content, but it does not directly tell you which NSG rule blocked the flow.
- D
Effective routes
Why wrong: Effective routes show path selection, not whether a security rule is allowing or denying traffic on a port.
Quick Answer
The answer is IP flow verify, a Network Watcher feature that directly identifies the blocking NSG rule. This tool tests a specific traffic flow by simulating a packet between a source and destination VM, then evaluating all effective security rules—including Network Security Groups and Application Security Groups—to determine if the traffic is allowed or denied. When a connection on TCP 1433 fails, IP flow verify not only confirms the block but returns the exact rule name, priority, and direction responsible, making it the precise diagnostic tool for this scenario. On the AZ-104 exam, this question tests your ability to differentiate Network Watcher tools: IP flow verify is for rule-level troubleshooting, while NSG diagnostics or topology might be traps. A common memory tip is to think of IP flow verify as a “packet detective” that traces the path and points a finger at the guilty rule.
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 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?
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
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.
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.
- ✗
Connection troubleshoot
Why it's wrong here
Connection troubleshoot checks end-to-end reachability, but it does not specifically identify the exact NSG rule decision as directly as flow verification does.
- ✓
IP flow verify
Why this is correct
IP flow verify is designed to test whether a specific packet would be allowed or denied by the effective NSG rules on a VM NIC. It helps the administrator identify the rule name and direction that controls the flow. That makes it the best choice when the question is specifically about an NSG decision on a given source, destination, protocol, and port.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Packet capture
Why it's wrong here
Packet capture is useful for analyzing traffic content, but it does not directly tell you which NSG rule blocked the flow.
- ✗
Effective routes
Why it's wrong here
Effective routes show path selection, not whether a security rule is allowing or denying traffic on a port.
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 but does not identify the blocking rule) with IP flow verify, which is the precise tool for rule-level diagnosis.
Trap categories for this question
Command / output trap
Effective routes show path selection, not whether a security rule is allowing or denying traffic on a port.
Detailed technical explanation
How to think about this question
IP flow verify works by simulating a packet based on the source/destination IP, port, and protocol (e.g., TCP 1433) and evaluating it against the effective NSG rules applied to the NIC/subnet. It returns the result (Allowed/Denied) and the exact rule name and priority that caused the decision. This feature is especially useful when multiple NSGs are applied at subnet and NIC levels, as it evaluates the combined effect.
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: IP flow verify — 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.
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 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?
hard- A.Effective routes, because it shows the exact NSG rule name for blocked traffic.
- ✓ B.IP flow verify, because it evaluates the 5-tuple and reports the matching allow or deny rule.
- C.Packet capture, because it automatically tells you which NSG rule denied the traffic.
- D.Connection troubleshoot, because it only checks DNS name resolution.
Why B: 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.
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.
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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