CISSP Security Assessment and Testing Practice Question
This CISSP practice question tests your understanding of security assessment and testing. 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 security team is analyzing logs from multiple sources and notices anomalous outbound traffic to a known 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
✓
A host is compromised and is beaconing
Anomalous outbound traffic to a known command-and-control (C2) server is a classic indicator of compromise (IoC). Compromised hosts often beacon outbound to C2 infrastructure using HTTP, HTTPS, or DNS tunnels to receive instructions or exfiltrate data. This pattern is distinct from normal traffic and is a primary focus of network security monitoring and intrusion detection systems (IDS).
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.
✗
A misconfigured firewall is causing traffic
Why it's wrong here
Misconfiguration might cause traffic to many destinations, not specifically a known C2.
✓
A host is compromised and is beaconing
Why this is correct
Behavior consistent with malware communicating with its C2 server.
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.
✗
An employee is streaming video to a personal server
Why it's wrong here
Unlikely to be a known C2 server; personal streaming would not use such patterns.
✗
The network is under a DDoS attack
Why it's wrong here
DDoS attacks generate inbound traffic, not outbound to a specific C2.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse anomalous outbound traffic with a network misconfiguration or a benign user activity, failing to recognize that beaconing to a known malicious destination is a definitive sign of compromise, not a configuration error or a DDoS symptom.
Detailed technical explanation
How to think about this question
Beaconing traffic often uses periodic HTTP GET or POST requests to a static URL, with intervals ranging from seconds to hours, and may include encrypted payloads or user-agent strings mimicking legitimate browsers. Security teams correlate these patterns with threat intelligence feeds (e.g., AlienVault OTX, MISP) that list known C2 IPs and domains. In real-world scenarios, such as the SolarWinds attack, compromised hosts used encrypted C2 channels over HTTPS to blend in with normal traffic, making detection reliant on behavioral analytics rather than simple signature matching.
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 CISSP question in full detail.
Security Assessment and Testing — This question tests Security Assessment and Testing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A host is compromised and is beaconing — Anomalous outbound traffic to a known command-and-control (C2) server is a classic indicator of compromise (IoC). Compromised hosts often beacon outbound to C2 infrastructure using HTTP, HTTPS, or DNS tunnels to receive instructions or exfiltrate data. This pattern is distinct from normal traffic and is a primary focus of network security monitoring and intrusion detection systems (IDS).
What should I do if I get this CISSP 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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