The answer is an incorrect pre-shared key. This is the most likely cause because the authentication error occurs during the 4-way handshake in WPA2 or WPA3, where the laptop and access point must prove they share the same secret passphrase. Since the wireless adapter is enabled and the SSID is visible, the issue is not with hardware or signal strength but with credential verification; a mismatched PSK prevents the handshake from completing, resulting in an authentication failure. On the CompTIA ITF+ FC0-U61 exam, this scenario tests your ability to distinguish between connectivity issues—remember that a visible network with an authentication error almost always points to a wrong password, not a driver or interference problem. A common trap is to suspect the adapter or IP configuration, but the error message itself narrows the cause. Memory tip: “Auth error = key error”—if the network shows up but won’t let you in, check the passphrase first.
FC0-U61 Infrastructure Practice Question
This FC0-U61 practice question tests your understanding of infrastructure. 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.
A user reports that their laptop cannot connect to the corporate Wi-Fi. Other devices in the same area work fine. The network technician checks the laptop and sees that the wireless adapter is enabled and shows available networks, but the connection attempt to the corporate SSID fails with an authentication error. Which of the following 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.
Why wrong: MAC filtering typically prevents association entirely or blocks traffic after association, not an authentication error at the credential stage.
B
The DHCP lease has expired
Why wrong: DHCP lease expiration affects IP assignment, not authentication.
C
The pre-shared key is incorrect
An incorrect PSK causes authentication failure while the network is still visible.
D
The wireless adapter is disabled in Device Manager
Why wrong: A disabled adapter would not show available networks.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The pre-shared key is incorrect
The authentication error specifically indicates that the laptop failed to verify its credentials with the access point. Since the wireless adapter is enabled and the SSID is visible, the most common cause is an incorrect pre-shared key (PSK), which prevents the 4-way handshake in WPA2/WPA3 from completing successfully.
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 MAC address is filtered on the access point
Why it's wrong here
MAC filtering typically prevents association entirely or blocks traffic after association, not an authentication error at the credential stage.
✗
The DHCP lease has expired
Why it's wrong here
DHCP lease expiration affects IP assignment, not authentication.
✓
The pre-shared key is incorrect
Why this is correct
An incorrect PSK causes authentication failure while the network is still visible.
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 wireless adapter is disabled in Device Manager
Why it's wrong here
A disabled adapter would not show available networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse an authentication error with a connectivity issue like DHCP failure, but authentication errors are strictly tied to credential validation during the 802.11 handshake, not IP-layer problems.
Trap categories for this question
Command / output trap
A disabled adapter would not show available networks.
Detailed technical explanation
How to think about this question
In WPA2-PSK, the 4-way handshake uses the PSK to derive the Pairwise Transient Key (PTK). If the PSK is incorrect, the handshake fails at step 2 or 3, resulting in an 'Authentication error' in the OS logs. This is distinct from association failures, which occur if the SSID is not broadcast or the client is out of range.
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 practitioner preparing for the FC0-U61 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
Infrastructure — This question tests Infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The pre-shared key is incorrect — The authentication error specifically indicates that the laptop failed to verify its credentials with the access point. Since the wireless adapter is enabled and the SSID is visible, the most common cause is an incorrect pre-shared key (PSK), which prevents the 4-way handshake in WPA2/WPA3 from completing successfully.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.