- A
Apply the rule to all internal hosts with the same threshold
Why wrong: A uniform threshold will cause false positives for hosts that normally transfer large amounts of data.
- B
Trigger only when the destination IP is in a threat intelligence feed of known malicious IPs
Why wrong: This would miss exfiltration to unknown or new malicious IPs not yet in the feed.
- C
Use a baseline of normal traffic per host and trigger only when the volume exceeds the baseline by a significant margin
Baselines allow the rule to adapt to each host's typical behavior, reducing false positives while detecting anomalies.
- D
Set a static threshold of 10 MB for all hosts, but exclude traffic to common cloud storage providers
Why wrong: Static thresholds do not adapt to individual host baselines, and excluding cloud providers may miss exfiltration via those services.
Quick Answer
The answer is to use a baseline of normal traffic per host and trigger only when the volume exceeds the baseline by a significant margin. This approach is correct because a static threshold or a blanket rule applied to all internal hosts fails to account for the wide variation in normal data transfer patterns across different users and systems; a baseline adapts to each host’s typical behavior, distinguishing legitimate large transfers from anomalous spikes that indicate potential data exfiltration. On the CISSP exam, this question tests your understanding of SIEM correlation rule tuning and the balance between false positives and detection effectiveness—a common trap is assuming a simple volume threshold works universally, but examiners want you to recognize that behavioral baselines are essential for reducing noise in enterprise environments. A useful memory tip: think of it as “baseline before baseline”—establish normal first, then flag the outlier.
CISSP Security Operations Practice Question
This CISSP 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 security engineer is designing a new SIEM correlation rule to detect potential data exfiltration. The rule should trigger when a single internal host sends more than 10 MB of data to an external IP address within a 5-minute window, but only if the external IP is not on a whitelist of known business partners. Which approach best minimizes false positives while ensuring effective detection?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Use a baseline of normal traffic per host and trigger only when the volume exceeds the baseline by a significant margin
Option C is correct because using a baseline of normal traffic per host adapts to different users' behaviors, reducing false positives from legitimate large transfers. Option A is wrong because applying the rule to all internal hosts would generate many false positives from servers that routinely transfer large files. Option B is wrong because a static threshold does not account for varying normal usage. Option D is wrong because excluding only known partner IPs may miss exfiltration to unknown but legitimate external services.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Apply the rule to all internal hosts with the same threshold
Why it's wrong here
A uniform threshold will cause false positives for hosts that normally transfer large amounts of data.
- ✗
Trigger only when the destination IP is in a threat intelligence feed of known malicious IPs
Why it's wrong here
This would miss exfiltration to unknown or new malicious IPs not yet in the feed.
- ✓
Use a baseline of normal traffic per host and trigger only when the volume exceeds the baseline by a significant margin
Why this is correct
Baselines allow the rule to adapt to each host's typical behavior, reducing false positives while detecting anomalies.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Set a static threshold of 10 MB for all hosts, but exclude traffic to common cloud storage providers
Why it's wrong here
Static thresholds do not adapt to individual host baselines, and excluding cloud providers may miss exfiltration via those services.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISSP NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this CISSP question test?
Security Operations — This question tests Security Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a baseline of normal traffic per host and trigger only when the volume exceeds the baseline by a significant margin — Option C is correct because using a baseline of normal traffic per host adapts to different users' behaviors, reducing false positives from legitimate large transfers. Option A is wrong because applying the rule to all internal hosts would generate many false positives from servers that routinely transfer large files. Option B is wrong because a static threshold does not account for varying normal usage. Option D is wrong because excluding only known partner IPs may miss exfiltration to unknown but legitimate external services.
What should I do if I get this CISSP question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISSP NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 6, 2026
This CISSP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISSP exam.
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