The answer is that the service is using cached credentials that are out of sync with the domain controller. When a service account’s password is changed on the domain controller, the service itself still holds the old password in its cached logon session, causing repeated authentication failures that trigger rapid lockouts. On the Systems Security Practitioner SSCP exam, this scenario tests your understanding of how service accounts differ from user accounts—they often run continuously and cache credentials locally, unlike interactive logins that fetch fresh tickets. A common trap is assuming the account is under brute-force attack, but the lockout pattern (multiple failures in minutes) points to a single misconfigured service retrying stale credentials. Remember the mnemonic: “Service caches, password changes, lockout rages.”
SSCP Security Operations and Administration Practice Question
This SSCP practice question tests your understanding of security operations and administration. 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 analyst receives an alert that a user account has been locked out multiple times within 10 minutes. The analyst checks the account and finds it is a service account used for automated backups. What is the most likely cause?
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 service is using cached credentials that are out of sync with the domain controller.
Service accounts used for automated backups typically run as services that cache their credentials locally. When the password is changed on the domain controller, the cached credentials in the service's logon session become out of sync. The service repeatedly attempts to authenticate with the stale cached password, causing rapid lockout events within a short window.
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 service account's certificate has expired.
Why it's wrong here
Certificate expiration does not cause account lockouts; it affects authentication via certificates, not password-based lockouts.
✗
A brute force attack is targeting the service account.
Why it's wrong here
Brute force attacks typically target user accounts, not service accounts, and would generate many failed logins, not just lockouts.
✗
The account password has expired and needs to be reset.
Why it's wrong here
Password expiry does not cause lockouts; it prevents login.
✓
The service is using cached credentials that are out of sync with the domain controller.
Why this is correct
Service accounts often cache credentials; if the password changes or becomes out of sync, repeated lockouts occur.
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
The trap here is that candidates confuse a service account lockout with a brute force attack, but the pattern of rapid lockouts from the same source with no external IP variation points to cached credential mismatch, not an active attack.
Detailed technical explanation
How to think about this question
Windows service accounts store credentials in the Local Security Authority (LSA) secrets. When a service is configured to 'Log on as' a specific account, the password hash is cached. If the domain controller password changes (e.g., via a scheduled password rotation or manual reset), the cached hash becomes invalid. The service retries authentication every few seconds, each failed attempt incrementing the badPwdCount attribute until the lockout threshold (default 10 attempts) is reached, then resets after the lockout observation window (default 30 minutes).
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
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.
Security Operations and Administration — This question tests Security Operations and Administration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The service is using cached credentials that are out of sync with the domain controller. — Service accounts used for automated backups typically run as services that cache their credentials locally. When the password is changed on the domain controller, the cached credentials in the service's logon session become out of sync. The service repeatedly attempts to authenticate with the stale cached password, causing rapid lockout events within a short window.
What should I do if I get this SSCP 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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