hardMultiple ChoiceObjective-mapped
FC0-U71 Practice Question: Refer to the exhibit
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?
⚠ Common exam trap
A common mix-up: candidates 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.
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
✓
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.
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.
- ✗
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.
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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.