CS0-003 Incident Response and Management Practice Question
This CS0-003 practice question tests your understanding of incident response and management. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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
C:\> netstat -an
Active Connections
Proto Local Address Foreign Address State
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING
TCP 192.168.1.100:49152 10.0.0.50:443 ESTABLISHED
TCP 192.168.1.100:49153 203.0.113.5:4444 ESTABLISHED
TCP 192.168.1.100:49154 203.0.113.5:4444 ESTABLISHED
TCP 192.168.1.100:49155 203.0.113.5:4444 ESTABLISHED
UDP 0.0.0.0:123 *:*
Refer to the exhibit. An analyst sees this output from a workstation. Which of the following is the most likely explanation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
C:\> netstat -an
Active Connections
Proto Local Address Foreign Address State
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING
TCP 192.168.1.100:49152 10.0.0.50:443 ESTABLISHED
TCP 192.168.1.100:49153 203.0.113.5:4444 ESTABLISHED
TCP 192.168.1.100:49154 203.0.113.5:4444 ESTABLISHED
TCP 192.168.1.100:49155 203.0.113.5:4444 ESTABLISHED
UDP 0.0.0.0:123 *:*
A
The workstation is receiving NTP time synchronization
Why wrong: NTP uses UDP, not TCP, and would not show multiple connections.
B
The workstation is performing a port scan
Why wrong: Port scans would show connections to multiple destinations, not repeated to same IP.
C
The workstation is a web server
Why wrong: Only one listening service on port 80; active outbound connections are not typical for a web server.
D
The workstation is infected with malware connecting to a C2 server
Multiple connections to the same IP on port 4444 is suspicious.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The workstation is infected with malware connecting to a C2 server
The output shows repeated outbound TCP connections to a single external IP address on port 443 (HTTPS) with varying source ports, which is characteristic of beaconing behavior. Malware often establishes periodic connections to a command-and-control (C2) server to receive instructions or exfiltrate data, and the pattern of multiple connections from different ephemeral ports to the same destination is a common indicator of such activity.
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.
✗
The workstation is receiving NTP time synchronization
Why it's wrong here
NTP uses UDP, not TCP, and would not show multiple connections.
✗
The workstation is performing a port scan
Why it's wrong here
Port scans would show connections to multiple destinations, not repeated to same IP.
✗
The workstation is a web server
Why it's wrong here
Only one listening service on port 80; active outbound connections are not typical for a web server.
✓
The workstation is infected with malware connecting to a C2 server
Why this is correct
Multiple connections to the same IP on port 4444 is suspicious.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see HTTPS (port 443) and assume legitimate web server or normal browsing, missing the key indicator of repeated outbound connections to a single external IP, which is a hallmark of C2 beaconing rather than typical client-server communication.
Trap categories for this question
Command / output trap
NTP uses UDP, not TCP, and would not show multiple connections.
Detailed technical explanation
How to think about this question
Beaconing traffic often uses HTTPS (TCP/443) to blend in with normal web traffic, making it harder to detect with simple port-based rules. The repeated connections with varying source ports suggest the malware is using ephemeral ports to avoid stateful firewall tracking, and the consistent destination IP and port indicate a fixed C2 endpoint. In real-world incident response, analysts look for such patterns in netstat or firewall logs to identify compromised hosts that are phoning home.
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 security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Incident Response and Management — This question tests Incident Response and Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The workstation is infected with malware connecting to a C2 server — The output shows repeated outbound TCP connections to a single external IP address on port 443 (HTTPS) with varying source ports, which is characteristic of beaconing behavior. Malware often establishes periodic connections to a command-and-control (C2) server to receive instructions or exfiltrate data, and the pattern of multiple connections from different ephemeral ports to the same destination is a common indicator of such activity.
What should I do if I get this CS0-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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