- A
The senior partner's password was changed during incident response, and his workstation has cached old credentials
After credential compromise, passwords are often reset. The workstation may be using cached old credentials, causing authentication failure despite network connectivity.
- B
The senior partner's account was disabled by the automatic containment script
Why wrong: The scenario states the account is not locked out, so it is not disabled.
- C
The ransomware modified the file server's permissions to deny access to the senior partner's account
Why wrong: Ransomware typically encrypts files but does not alter NTFS permissions to block specific users; it uses encryption to deny access.
- D
The senior partner's workstation IP address was blacklisted on the file server
Why wrong: IP blacklisting would prevent all network communication, but the partner can ping the server, indicating the IP is not blocked.
Quick Answer
The answer is that the senior partner’s workstation is using cached old credentials after his password was changed during incident response. When a user’s password is reset in Active Directory, the local Windows machine retains the previous NTLM hash in its credential cache until the user explicitly logs off and back on. Because the partner never logged off, his workstation continues to present the outdated credentials to the file server, triggering an “Access Denied” error even though his account is active and the new password is correct. On the CompTIA ITF+ FC0-U61 exam, this scenario tests your understanding of cached credentials and how password changes affect network authentication—a common trap is assuming the account is locked or the server is offline. Remember the key point: cached credentials persist until a fresh logon occurs. Memory tip: “Log off to refresh the cache, or the old hash will block your access.”
FC0-U61 Security Practice Question
This FC0-U61 practice question tests your understanding of security. 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.
You are the IT security administrator for a mid-sized law firm that handles sensitive client data. The firm has a mix of Windows 10 workstations, a Windows Server 2019 domain controller, and a network printer. All users have standard user accounts. The senior partner recently received a phishing email that appeared to be from a known client, requesting that he click a link to review a document. He clicked the link and entered his domain credentials on a fake login page. Shortly after, the firm's file server began encrypting files and displaying a ransom note. The incident response team isolated the infected server and restored files from backup. However, the senior partner now reports that he cannot access the file server from his workstation. He receives an 'Access Denied' message. You check his account in Active Directory and find that his account is not locked out and the password is correct. The file server is back online and accessible by other users. You verify that the senior partner's workstation has network connectivity and can ping the file server. Which of the following is the MOST likely cause of the access issue?
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 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
The senior partner's password was changed during incident response, and his workstation has cached old credentials
The senior partner's password was likely changed during the incident response process to prevent further unauthorized access using his compromised credentials. When a password is changed in Active Directory, the user's workstation still caches the old credentials (NTLM hash) until the user logs off and back on. Since the partner has not logged off, his workstation continues to present the old, invalid credentials to the file server, resulting in an 'Access Denied' error despite the account being active and the password being correct.
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 senior partner's password was changed during incident response, and his workstation has cached old credentials
Why this is correct
After credential compromise, passwords are often reset. The workstation may be using cached old credentials, causing authentication failure despite network connectivity.
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.
- ✗
The senior partner's account was disabled by the automatic containment script
Why it's wrong here
The scenario states the account is not locked out, so it is not disabled.
- ✗
The ransomware modified the file server's permissions to deny access to the senior partner's account
Why it's wrong here
Ransomware typically encrypts files but does not alter NTFS permissions to block specific users; it uses encryption to deny access.
- ✗
The senior partner's workstation IP address was blacklisted on the file server
Why it's wrong here
IP blacklisting would prevent all network communication, but the partner can ping the server, indicating the IP is not blocked.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume ransomware or containment scripts directly caused the access issue, overlooking the subtle credential caching behavior that persists after a password change without a logoff/logon cycle.
Trap categories for this question
Scenario analysis trap
The scenario states the account is not locked out, so it is not disabled.
Detailed technical explanation
How to think about this question
Windows caches the last 10 interactive logon credentials (NTLM hashes) in the LSASS process memory to enable offline logon and network authentication without contacting a domain controller. When a password is changed in Active Directory, the cached credentials on the workstation remain unchanged until the user explicitly logs off and logs back on, causing authentication failures for network resources like file shares (SMB). This is a common post-incident issue where credential rotation is performed but users are not forced to re-authenticate.
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 administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
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FAQ
Questions learners often ask
What does this FC0-U61 question test?
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The senior partner's password was changed during incident response, and his workstation has cached old credentials — The senior partner's password was likely changed during the incident response process to prevent further unauthorized access using his compromised credentials. When a password is changed in Active Directory, the user's workstation still caches the old credentials (NTLM hash) until the user logs off and back on. Since the partner has not logged off, his workstation continues to present the old, invalid credentials to the file server, resulting in an 'Access Denied' error despite the account being active and the password being correct.
What should I do if I get this FC0-U61 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.
About these practice questions
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Last reviewed: Jun 11, 2026
This FC0-U61 practice question is part of Courseiva's free CompTIA 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 FC0-U61 exam.
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