The answer is an incorrect DNS server configuration. This is the correct choice because when a user can browse the internet by IP address but not by domain name, it reveals that the network connection itself is functional, but the system cannot translate human-friendly domain names into machine-readable IP addresses—a process handled exclusively by DNS. On the CompTIA ITF+ FC0-U61 exam, this classic symptom tests your understanding of the OSI model’s application layer and the fundamental role of name resolution. A common trap is to suspect the default gateway or DHCP settings, but since IP-based browsing works, routing and IP assignment are fine. Remember the memory tip: “DNS does the name-to-IP translation; if IPs work but names don’t, DNS is the mission.”
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.
Refer to the exhibit. The user is unable to browse the internet using domain names but can access websites by IP address. Which configuration is most likely incorrect?
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
✓
DNS server addresses
The user can access websites by IP address but not by domain name, which indicates that DNS resolution is failing. The DNS server addresses configuration is most likely incorrect, as the client cannot translate domain names to IP addresses without a valid DNS server. This is a classic symptom of a misconfigured or missing DNS server setting.
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.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse DNS failure with general connectivity issues, but the ability to browse by IP address proves that routing and IP configuration are correct, isolating the problem to DNS server settings.
Detailed technical explanation
How to think about this question
DNS resolution relies on the client sending a query to a configured DNS server (typically on UDP port 53) to resolve a fully qualified domain name (FQDN) to an IP address. If the DNS server address is incorrect or unreachable, the client will receive a 'Server Not Found' error despite having full IP connectivity. In a typical home or small office network, the DNS server is often the router's IP or a public resolver like 8.8.8.8; misconfiguring this value breaks name resolution while leaving other network functions intact.
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.
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: DNS server addresses — The user can access websites by IP address but not by domain name, which indicates that DNS resolution is failing. The DNS server addresses configuration is most likely incorrect, as the client cannot translate domain names to IP addresses without a valid DNS server. This is a classic symptom of a misconfigured or missing DNS server setting.
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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