The answer is to check the link lights on the network adapter first. This is correct because the CompTIA troubleshooting methodology always begins with verifying the physical layer of the OSI model, as a loose or damaged cable is the simplest and most common cause of network connectivity failure. By checking the link lights, you confirm the adapter is receiving power and has a physical connection to the switch or router, eliminating hardware issues before moving to software or configuration checks. On the CompTIA ITF+ FC0-U61 exam, this concept tests your understanding of the “identify the problem” step, where a common trap is jumping straight to IP configuration or DNS settings without first confirming the cable is plugged in. A useful memory tip is “Link lights before link rights”—always verify the physical connection before troubleshooting network rights or permissions.
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 technician is troubleshooting a computer that cannot connect to the network. Which THREE steps should the technician perform first in the troubleshooting process?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check if the network cable is securely connected
Option B is correct because checking the physical connection is the first step in the CompTIA A+ troubleshooting methodology. A loose or damaged network cable is a common cause of connectivity failure, and verifying it eliminates the simplest issue before moving to software or configuration checks.
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.
✗
Reinstall the operating system
Why it's wrong here
Reinstalling the OS is an extreme measure and should be done last.
✓
Check if the network cable is securely connected
Why this is correct
A loose cable is a common cause; checking it is a first step.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Verify IP address configuration
Why this is correct
Incorrect IP settings can prevent connectivity; verifying is a basic step.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Check link lights on the network adapter
Why this is correct
Link lights indicate physical connectivity; checking them is quick and informative.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Replace the network interface card
Why it's wrong here
Replacing hardware is a drastic step to be taken only after other checks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may jump to software or hardware replacement steps (like reinstalling the OS or replacing the NIC) without first performing basic physical and configuration checks, which are the foundation of systematic troubleshooting.
Detailed technical explanation
How to think about this question
Link lights on the network adapter indicate Layer 1 (physical) connectivity; a solid green or amber light typically signals a good link, while no light suggests a cable or port issue. Verifying IP configuration involves using commands like `ipconfig` (Windows) or `ifconfig` (Linux/macOS) to ensure the device has a valid IP address, subnet mask, and default gateway, which are essential for Layer 3 communication. These steps align with the CompTIA troubleshooting methodology: identify the problem, establish a theory of probable cause, and test the theory.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation 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.
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: Check if the network cable is securely connected — Option B is correct because checking the physical connection is the first step in the CompTIA A+ troubleshooting methodology. A loose or damaged network cable is a common cause of connectivity failure, and verifying it eliminates the simplest issue before moving to software or configuration checks.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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