The answer is whether one service account repeatedly fails after a password change, combined with analyzing the source distribution and timing of failed logons. This distinction works because a true brute-force attack typically floods from multiple source IPs or a single source with high-frequency failures in a short window, while a misconfigured service account produces predictable, regular-interval failures from a consistent source, often tied to retry intervals in application config. On the CompTIA CySA+ CS0-003 exam, this tests your ability to differentiate automated attack patterns from benign misconfiguration in log analysis—a common trap is mistaking steady, repetitive failures for an attack when it’s actually a service stuck in a retry loop. Remember the mnemonic: “Multiple sources, mad dash; single source, steady splash.”
CS0-003 Security Operations Practice Question
This CS0-003 practice question tests your understanding of security operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which evidence helps distinguish a true brute-force attack from a misconfigured service account? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Source distribution and timing of failed logons
Option B is correct because a true brute-force attack typically originates from multiple source IP addresses or a single source with a high frequency of failed logons over a short time window, whereas a misconfigured service account usually fails from a consistent source at regular intervals. Analyzing the source distribution and timing of failed logons helps distinguish automated attack patterns from predictable service account behavior, such as retry intervals defined in application configuration.
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 number of monitors used by the administrator
Why it's wrong here
Monitor count does not explain authentication failures.
✓
Source distribution and timing of failed logons
Why this is correct
Distributed or patterned failures suggest attack activity.
Related concept
Read the scenario before looking for a memorised answer.
✓
Whether one service account repeatedly fails after a password change
Why this is correct
A single repeating account may indicate stale credentials.
Related concept
Read the scenario before looking for a memorised answer.
✗
The brand of the office router only
Why it's wrong here
Router brand alone does not classify the authentication pattern.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that any repeated failed logon after a password change is evidence of an attack, when in fact it is a classic symptom of a misconfigured service account that has not been updated with the new credentials.
Detailed technical explanation
How to think about this question
Under the hood, brute-force attacks often exhibit a Poisson-like distribution of failed logon attempts across multiple usernames or IPs, while misconfigured service accounts produce deterministic, periodic failures tied to application retry logic (e.g., LDAP bind retries every 30 seconds). In real-world scenarios, analyzing Windows Security Event ID 4625 (failed logon) with fields like Source Network Address and TimeCreated can reveal whether failures are scattered across many IPs (attack) or originate from a single IP with consistent intervals (misconfiguration).
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 CS0-003 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: Source distribution and timing of failed logons — Option B is correct because a true brute-force attack typically originates from multiple source IP addresses or a single source with a high frequency of failed logons over a short time window, whereas a misconfigured service account usually fails from a consistent source at regular intervals. Analyzing the source distribution and timing of failed logons helps distinguish automated attack patterns from predictable service account behavior, such as retry intervals defined in application configuration.
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.
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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