The answer is IP flow verify. This Network Watcher tool is the correct choice because it performs a connectivity test using a 5-tuple analysis—source IP, destination IP, source port, destination port, and protocol—to determine whether traffic is allowed or denied by an effective security rule. When you specify TCP 1433 as the destination port, IP flow verify evaluates all applied Network Security Groups (NSGs) and Application Security Groups (ASGs) and returns the exact rule name and direction that is blocking the traffic, making it the precise tool for identifying a blocking NSG rule. On the AZ-104 exam, this scenario often appears as a troubleshooting question where you must choose between IP flow verify, NSG diagnostics, or next hop; the common trap is selecting NSG diagnostics, which only shows rules but does not test actual traffic flow. Remember the memory tip: IP flow verify is the “traffic tester” that gives you the rule name—if you need to know which rule is blocking, always verify with IP flow verify.
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 summary: VM1 to VM2 on TCP 1433 shows Status = Blocked; connection troubleshooting reports that the destination is reachable at the route level; the administrator needs the specific allow or deny rule name.
Based on the exhibit, which Network Watcher tool should the administrator use to identify the exact NSG rule that is blocking TCP 1433 traffic?
Troubleshooting summary: VM1 to VM2 on TCP 1433 shows Status = Blocked; connection troubleshooting reports that the destination is reachable at the route level; the administrator needs the specific allow or deny rule name.
A
Connection troubleshoot
Why wrong: This confirms reachability and path issues, but it does not identify the exact NSG rule.
B
IP flow verify
IP flow verify returns whether a flow is allowed or denied and shows the matching NSG rule.
C
Next hop
Why wrong: Next hop only shows routing decisions, not security rule matches for a specific flow.
D
Packet capture
Why wrong: Packet capture can help analyze packets, but it is not the fastest way to identify the NSG rule.
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 is the correct Network Watcher tool because it tests whether a packet is allowed or denied to or from a specific virtual machine based on a 5-tuple (source IP, destination IP, source port, destination port, and protocol). By specifying TCP 1433 as the destination port, the tool evaluates all effective security rules (NSG and ASG) and returns the exact rule name and direction that is blocking the traffic.
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
This confirms reachability and path issues, but it does not identify the exact NSG rule.
✓
IP flow verify
Why this is correct
IP flow verify returns whether a flow is allowed or denied and shows the matching NSG rule.
Related concept
Read the scenario before looking for a memorised answer.
✗
Next hop
Why it's wrong here
Next hop only shows routing decisions, not security rule matches for a specific flow.
✗
Packet capture
Why it's wrong here
Packet capture can help analyze packets, but it is not the fastest way to identify the NSG rule.
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 not rule-level blocking) with 'IP flow verify' (which explicitly evaluates NSG rules), leading them to select A instead of B.
Trap categories for this question
Command / output trap
Next hop only shows routing decisions, not security rule matches for a specific flow.
Detailed technical explanation
How to think about this question
IP flow verify works by simulating a packet against the effective security rules of the network interface and subnet NSG, using the Azure Resource Manager API to evaluate rules in priority order. It returns the rule name, direction (inbound/outbound), and whether the traffic is allowed or denied, making it ideal for troubleshooting NSG denials. In a real-world scenario, if a SQL Server is unreachable on port 1433, IP flow verify can quickly confirm if a deny rule (e.g., a custom rule blocking port 1433 from a specific subnet) is the cause, without needing to manually parse NSG rule sets.
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.
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 is the correct Network Watcher tool because it tests whether a packet is allowed or denied to or from a specific virtual machine based on a 5-tuple (source IP, destination IP, source port, destination port, and protocol). By specifying TCP 1433 as the destination port, the tool evaluates all effective security rules (NSG and ASG) and returns the exact rule name and direction that is blocking the traffic.
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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