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FC0-U71 DNS Practice Question
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. What is the most likely cause and the best course of action?
⚠ Common exam trap
Candidates may mistakenly think that changing DNS settings on the router will fix the issue, but the workstations are already using the ISP's DNS directly. The real trap is recognizing that a specific site outage is likely due to an ISP-level block rather than a local DNS misconfiguration.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Contact the ISP to unblock Trello.
Since only Trello is inaccessible while other websites (including Google and YouTube) work, the issue is likely specific to Trello, not a general network or DNS problem. The workstations already use the ISP's DNS servers (8.8.8.8 and 8.8.4.4) as indicated, so changing the router's DNS to the same would not resolve the issue. The most plausible cause is that the ISP is blocking access to Trello, possibly due to a security policy or a temporary restriction. Therefore, the best course of action is to contact the ISP and ask them to unblock Trello.
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 it's wrong here
Using ISP's DNS may resolve resolution issues for Trello's domain if Google's DNS has a temporary problem.
- ✓
Contact the ISP to unblock Trello.
Why this is correct
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 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-U71 exam.