FC0-U61 IT Concepts and Terminology Practice Question
This FC0-U61 practice question tests your understanding of it concepts and terminology. 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.
Exhibit
IP Address: 192.168.1.10
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1
DNS Server: 8.8.8.8
Refer to the exhibit. A user is unable to access the internet but can ping the default gateway. Based on the exhibit, 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.
IP Address: 192.168.1.10
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1
DNS Server: 8.8.8.8
A
Firewall blocking traffic
Why wrong: A firewall might block HTTP/HTTPS traffic, but the user can ping the gateway, so the network path is not entirely blocked; DNS is more likely.
B
Duplicate IP address
Why wrong: A duplicate IP would cause conflicts and intermittent connectivity, not a specific inability to access the internet while being able to ping the gateway.
C
Incorrect DNS server
If the DNS server is misconfigured or unreachable, the user cannot resolve domain names to IP addresses, even though local connectivity works.
D
Incorrect subnet mask
Why wrong: The subnet mask 255.255.255.0 is standard for a /24 network; ping to gateway works, so subnet is likely correct.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Incorrect DNS server
The user can ping the default gateway, which confirms that Layer 3 connectivity to the local network is working and that the firewall is not blocking ICMP traffic. However, the inability to access the internet (by name or IP) while local connectivity works points to a failure in name resolution. An incorrect DNS server address prevents the client from resolving domain names to IP addresses, which is the most likely cause given the symptoms.
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.
✗
Firewall blocking traffic
Why it's wrong here
A firewall might block HTTP/HTTPS traffic, but the user can ping the gateway, so the network path is not entirely blocked; DNS is more likely.
✗
Duplicate IP address
Why it's wrong here
A duplicate IP would cause conflicts and intermittent connectivity, not a specific inability to access the internet while being able to ping the gateway.
✓
Incorrect DNS server
Why this is correct
If the DNS server is misconfigured or unreachable, the user cannot resolve domain names to IP addresses, even though local connectivity works.
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.
✗
Incorrect subnet mask
Why it's wrong here
The subnet mask 255.255.255.0 is standard for a /24 network; ping to gateway works, so subnet is likely correct.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume 'no internet' means a firewall or routing issue, but the ability to ping the gateway proves Layer 3 connectivity is fine, forcing the focus onto DNS as the missing piece for name-based access.
Detailed technical explanation
How to think about this question
DNS resolution relies on the client sending a UDP query to port 53 of the configured DNS server. If the DNS server address is incorrect (e.g., a non-existent or unreachable IP), the client will receive no response or a 'server failure' and cannot translate a domain like www.example.com to an IP address. In contrast, ICMP echo requests (pings) use IP addresses directly and do not require DNS, which is why the user can ping the gateway but cannot browse the internet by name.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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.
IT Concepts and Terminology — This question tests IT Concepts and Terminology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Incorrect DNS server — The user can ping the default gateway, which confirms that Layer 3 connectivity to the local network is working and that the firewall is not blocking ICMP traffic. However, the inability to access the internet (by name or IP) while local connectivity works points to a failure in name resolution. An incorrect DNS server address prevents the client from resolving domain names to IP addresses, which is the most likely cause given the symptoms.
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.
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Question Discussion
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