The answer is Packet capture, the Network Watcher capability designed to capture packets on a VM NIC for deep TCP traffic inspection. This tool works by installing an extension on the virtual machine to record raw network traffic, allowing you to analyze retransmissions and the full TCP handshake sequence—SYN, SYN-ACK, ACK—after a test run. On the AZ-104 exam, this scenario tests your ability to differentiate between Network Watcher tools: packet capture for post-hoc packet-level analysis versus connection troubleshoot for live connectivity checks or NSG flow logs for traffic patterns. A common trap is choosing "Connection troubleshoot" because it tests TCP connectivity, but it only verifies reachability and latency, not raw packet details like retransmissions. Remember the memory tip: "Packets for playback, troubleshoot for today"—if you need to replay and inspect handshake details after the fact, packet capture is your tool.
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 web application on a VM is failing on TCP 8443. The administrator wants to capture packets on the VM NIC to inspect retransmissions and handshake details after the test run. Which Network Watcher capability should be used?
Why wrong: IP flow verify only tells you whether an NSG rule allows or blocks a flow, not the packet contents.
B
Connection troubleshoot
Why wrong: Connection troubleshoot tests connectivity, but it does not provide captured packets for later analysis.
C
Packet capture
Packet capture records network traffic on the VM NIC so the administrator can analyze the exchange later. It is the right choice when the problem may involve retransmissions, handshake failures, or other packet-level behavior rather than only a routing or NSG question.
D
Effective routes
Why wrong: Effective routes helps with path selection, but it does not capture actual packet data.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Packet capture
Packet capture in Network Watcher allows you to capture network traffic to and from a VM, including TCP retransmissions and handshake details (SYN, SYN-ACK, ACK). This is the correct tool for inspecting raw packets after a test run to diagnose issues like failed connections on TCP 8443.
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 it's wrong here
IP flow verify only tells you whether an NSG rule allows or blocks a flow, not the packet contents.
✗
Connection troubleshoot
Why it's wrong here
Connection troubleshoot tests connectivity, but it does not provide captured packets for later analysis.
✓
Packet capture
Why this is correct
Packet capture records network traffic on the VM NIC so the administrator can analyze the exchange later. It is the right choice when the problem may involve retransmissions, handshake failures, or other packet-level behavior rather than only a routing or NSG question.
Related concept
Read the scenario before looking for a memorised answer.
✗
Effective routes
Why it's wrong here
Effective routes helps with path selection, but it does not capture actual packet data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse IP flow verify or Connection troubleshoot with packet capture, not realizing that only packet capture provides raw packet data for analyzing retransmissions and handshake details.
Detailed technical explanation
How to think about this question
Packet capture uses the Azure VM agent to run a network trace (e.g., tcpdump on Linux or netsh on Windows) and stores the output in a .cap or .pcap file. This allows you to analyze TCP sequence numbers, retransmission timers, and three-way handshake failures using tools like Wireshark. In real-world scenarios, packet capture is essential for diagnosing issues like half-open connections or TCP window scaling problems that are invisible to higher-level connectivity tests.
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: Packet capture — Packet capture in Network Watcher allows you to capture network traffic to and from a VM, including TCP retransmissions and handshake details (SYN, SYN-ACK, ACK). This is the correct tool for inspecting raw packets after a test run to diagnose issues like failed connections on TCP 8443.
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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