The correct answer is to change the DNS server settings on the router to use the ISP’s DNS servers. This resolves the DNS issue where a specific website like Trello is not loading, even though other sites work, because the workstations are manually configured with Google Public DNS (8.8.8.8 and 8.8.4.4) instead of the ISP’s DNS. When the router’s DHCP distributes its own default DNS, it may hold a stale or incorrect cache entry for Trello, blocking access only to that domain. On the CompTIA ITF+ FC0-U61 exam, this scenario tests your understanding of DNS resolution hierarchy and DHCP distribution—a common trap is assuming workstation settings override the router, when in fact the router’s DNS is what all devices receive by default. Remember the tip: “If one site fails but others work, suspect a DNS cache or misconfigured DNS server, not a network outage.”
FC0-U61 Applications and Software Practice Question
This FC0-U61 practice question tests your understanding of applications and software. 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 a system administrator for a small marketing firm. The firm uses a web-based project management application (Trello) for task tracking. One morning, users report that they cannot access Trello from any workstation. However, other websites (e.g., Google, YouTube) are accessible. The network uses a single router with default settings. No changes were made to the network or firewall overnight. You check the DNS settings on a workstation and it points to the ISP's DNS server (8.8.8.8 and 8.8.4.4). What is the most likely cause and the best course of action?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
✓
Change the DNS server settings on the router to use the ISP's DNS servers.
The workstation DNS settings point to 8.8.8.8 and 8.8.4.4, which are Google Public DNS servers, not the ISP's DNS servers. Since other websites are accessible, the issue is likely that the router's DHCP is not distributing these DNS servers, causing workstations to use the router's default DNS (often the ISP's) which may have a cached or incorrect entry for Trello. Changing the router's DNS settings to use the ISP's DNS servers ensures consistent resolution across all devices, resolving the Trello access issue.
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.
✓
Change the DNS server settings on the router to use the ISP's DNS servers.
Why this is correct
Using ISP's DNS may resolve resolution issues for Trello's domain if Google's DNS has a temporary problem.
Clue confirmation
The clue words "best", "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Contact the ISP to unblock Trello.
Why it's wrong here
ISPs typically do not block Trello unless requested; DNS issue is more likely.
✗
Reset the router to factory defaults.
Why it's wrong here
Resetting the router is drastic and may not address DNS resolution issues.
✗
Clear the browser cache on all workstations.
Why it's wrong here
Clearing cache does not fix DNS resolution problems affecting all browsers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume 8.8.8.8 is the ISP's DNS server, but it is actually Google Public DNS, and the question tests whether you recognize that the router's default DNS settings may not match the workstation's manual configuration, leading to resolution failures for specific services.
Detailed technical explanation
How to think about this question
DNS resolution works by querying a recursive resolver (e.g., ISP's DNS) which may cache records with a TTL (Time to Live). If the router's DHCP offers a different DNS server (e.g., the router itself acting as a DNS forwarder) than what the workstation is manually set to, the workstation may bypass the router's cache and use Google's DNS, which could have a stale or different record for Trello. In real-world scenarios, misaligned DNS settings between DHCP and static configurations are a common cause of intermittent access issues, especially with SaaS platforms that use CDN-based load balancing.
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.
Applications and Software — This question tests Applications and Software — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the DNS server settings on the router to use the ISP's DNS servers. — The workstation DNS settings point to 8.8.8.8 and 8.8.4.4, which are Google Public DNS servers, not the ISP's DNS servers. Since other websites are accessible, the issue is likely that the router's DHCP is not distributing these DNS servers, causing workstations to use the router's default DNS (often the ISP's) which may have a cached or incorrect entry for Trello. Changing the router's DNS settings to use the ISP's DNS servers ensures consistent resolution across all devices, resolving the Trello access issue.
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: "best", "most likely". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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