- A
Install a network-based intrusion detection system to monitor the server.
Why wrong: Installing an IDS is a good long-term measure but does not address the immediate need to investigate the current suspicious connections.
- B
Capture and analyze the network traffic between the EMR server and the external IP.
Capturing and analyzing the traffic provides insight into whether data exfiltration is occurring and what data is being sent, allowing for an informed response.
- C
Isolate the EMR server from the network and run a full forensic analysis.
Why wrong: Isolating is a strong step but should be taken after confirming malicious activity; may not be necessary if traffic is benign.
- D
Block all outbound traffic from the EMR server to the internet immediately.
Why wrong: Blocking without understanding the traffic could disrupt hospital operations and cause availability issues.
CS0-003 Security Operations Practice Question
This CS0-003 practice question tests your understanding of security operations. 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.
A hospital's IT department has been receiving reports from nursing staff that the electronic medical record (EMR) system is responding slowly during peak hours. The network team has verified that the local area network is operating normally and there is no bandwidth congestion. The security analyst reviews the firewall logs and observes repeated outbound connections from the EMR server to an external IP address 198.51.100.23 on TCP port 443 at regular 5-minute intervals. Each connection transfers a small amount of data. The analyst also notes that the EMR server's antivirus software is up to date and no malware has been detected. The hospital's security policy requires that all outbound connections from critical servers be explicitly approved. Further investigation reveals that 198.51.100.23 is associated with a hosting provider in a foreign country. The analyst suspects a data exfiltration. Which of the following actions should the analyst take FIRST?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
Capture and analyze the network traffic between the EMR server and the external IP.
Option B is correct because the analyst must first confirm whether the outbound connections are actually exfiltrating data or are legitimate (e.g., software updates, license checks). Capturing and analyzing the network traffic (e.g., using tcpdump or Wireshark) allows the analyst to inspect the payload and determine the nature of the data being sent, which is a standard step in incident response before taking more disruptive actions.
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.
- ✗
Install a network-based intrusion detection system to monitor the server.
Why it's wrong here
Installing an IDS is a good long-term measure but does not address the immediate need to investigate the current suspicious connections.
- ✓
Capture and analyze the network traffic between the EMR server and the external IP.
Why this is correct
Capturing and analyzing the traffic provides insight into whether data exfiltration is occurring and what data is being sent, allowing for an informed response.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Isolate the EMR server from the network and run a full forensic analysis.
Why it's wrong here
Isolating is a strong step but should be taken after confirming malicious activity; may not be necessary if traffic is benign.
- ✗
Block all outbound traffic from the EMR server to the internet immediately.
Why it's wrong here
Blocking without understanding the traffic could disrupt hospital operations and cause availability issues.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the principle of 'least disruption first' in incident response, where candidates mistakenly choose an aggressive containment action (like isolation or blocking) before gathering sufficient evidence to confirm the threat.
Detailed technical explanation
How to think about this question
When investigating suspicious outbound connections, packet capture (PCAP) analysis can reveal the actual application-layer data, such as HTTP/HTTPS requests, DNS queries, or custom protocols. Even if the traffic is encrypted over TLS (port 443), the analyst can examine the TLS handshake, certificate details, and the size and timing of the data flows to infer whether it matches known exfiltration patterns (e.g., small, periodic beaconing). In real-world scenarios, attackers often use HTTPS to blend in with normal traffic, so deep packet inspection or proxy logs are critical to differentiate between benign and malicious activity.
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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this CS0-003 question test?
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Capture and analyze the network traffic between the EMR server and the external IP. — Option B is correct because the analyst must first confirm whether the outbound connections are actually exfiltrating data or are legitimate (e.g., software updates, license checks). Capturing and analyzing the network traffic (e.g., using tcpdump or Wireshark) allows the analyst to inspect the payload and determine the nature of the data being sent, which is a standard step in incident response before taking more disruptive actions.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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