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FC0-U71 Practice Question: A technician is troubleshooting a user's…
A technician is troubleshooting a user's inability to access the internet. The user can ping the default gateway but cannot ping external websites. What is the most likely issue?
⚠ Common exam trap
Many candidates assume a firewall is blocking traffic (Option A) when they see internet failure, but the ability to ping the gateway proves Layer 3 connectivity is intact, pointing instead to a DNS resolution issue.
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
✓
DNS server is not configured or is unreachable
The user can ping the default gateway, which confirms that the local network configuration (IP address, subnet mask, and gateway) is correct and that Layer 3 connectivity to the router is working. However, pinging external websites fails because the DNS server is not configured or unreachable, preventing the resolution of domain names to IP addresses. This is a classic symptom: internal connectivity works, but name resolution fails.
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 is blocking all outbound traffic
Why it's wrong here
A firewall blocking all outbound would also block ping to the gateway.
- ✗
Default gateway is down
Why it's wrong here
The gateway is reachable, so it is not down.
- ✗
IP address is misconfigured
Why it's wrong here
If the gateway is pingable, the IP configuration is likely correct.
- ✓
DNS server is not configured or is unreachable
Why this is correct
Pinging external sites by name fails if DNS is not resolving.
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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.