The correct conclusion is that the workstation is infected with malware that is beaconing to the attacker. This is because a large volume of outbound traffic from a single host to a known command-and-control (C2) IP address is a classic signature of malware beaconing detection, where the compromised system periodically sends small packets or HTTP/HTTPS requests to receive instructions or exfiltrate data. On the ISC2 Certified in Cybersecurity CC exam, this scenario tests your ability to recognize beaconing as a primary indicator of compromise (IoC) distinct from normal traffic, often appearing in questions about SOC analysis or incident response. A common trap is confusing beaconing with a denial-of-service attack or simple data transfer, but the key differentiator is the known malicious destination. Memory tip: think “Beacon = Bad Beacon” — if a single workstation is calling home to a flagged IP, it’s likely malware, not a user.
ISC2 CC Security Operations Practice Question
This CC practice question tests your understanding of security operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 SOC analyst notices that a large volume of outbound traffic is occurring from a single workstation to an external IP address known to be associated with a command-and-control server. What is the most likely conclusion?
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.
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 that is beaconing to the attacker
The large volume of outbound traffic from a single workstation to a known command-and-control (C2) server is a classic indicator of malware beaconing. Beaconing involves the infected host periodically sending small packets or HTTP/HTTPS requests to the C2 server to receive instructions or exfiltrate data, which matches the observed behavior. This is distinct from legitimate traffic patterns because the destination IP is specifically associated with malicious 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 network is experiencing a denial of service attack
Why it's wrong here
DoS attacks typically involve inbound traffic, not outbound from a single host.
✗
The user is streaming video from a blocked site
Why it's wrong here
Streaming video would not generate traffic to a known C2 server.
✗
The workstation is performing a legitimate software update
Why it's wrong here
Legitimate updates typically go to known, trusted domains, not known malicious IPs.
✓
The workstation is infected with malware that is beaconing to the attacker
Why this is correct
C2 communication is a hallmark of malware infection.
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
ISC2 often tests the distinction between a single workstation's outbound traffic to a known malicious IP versus generic network anomalies like DoS or legitimate updates, trapping candidates who confuse high-volume traffic with beaconing or assume any outbound traffic to an external IP is benign.
Detailed technical explanation
How to think about this question
Beaconing malware often uses HTTP/HTTPS with randomized intervals (e.g., 60-120 seconds) and small payloads to evade detection, and may employ domain generation algorithms (DGAs) to rotate C2 domains. In real-world scenarios, analysts can use tools like Zeek or Wireshark to identify beaconing by analyzing flow records for periodic connections to suspicious IPs, and then correlate with threat intelligence feeds. The key differentiator is the destination IP's reputation in threat databases, which is a core component of SOC triage.
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 analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
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: The workstation is infected with malware that is beaconing to the attacker — The large volume of outbound traffic from a single workstation to a known command-and-control (C2) server is a classic indicator of malware beaconing. Beaconing involves the infected host periodically sending small packets or HTTP/HTTPS requests to the C2 server to receive instructions or exfiltrate data, which matches the observed behavior. This is distinct from legitimate traffic patterns because the destination IP is specifically associated with malicious activity.
What should I do if I get this CC 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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Question Discussion
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