hardMultiple ChoiceObjective-mapped
FC0-U71 Practice Question: A technician is troubleshooting a network issue…
A technician is troubleshooting a network issue where a client cannot reach a server on a different subnet. The client's IP is 192.168.1.10/24, and the server's IP is 10.0.0.50/24. The client can ping its default gateway. Which device is most likely misconfigured?
⚠ Common exam trap
CompTIA often tests the misconception that a client's inability to reach a different subnet is due to DNS or the server's firewall, but the key clue is that the client can ping its default gateway, isolating the problem to Layer 3 routing between subnets.
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
✓
The router between subnets
The client can ping its default gateway, indicating that its local subnet (192.168.1.0/24) connectivity and the gateway's interface are working. However, the client cannot reach a server on a different subnet (10.0.0.0/24). This points to a routing issue: the router between the subnets is likely misconfigured—either missing a route to the 10.0.0.0/24 network or not performing inter-VLAN routing correctly. Without proper routing, the router drops or fails to forward packets destined for the server's subnet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The client's DNS settings
Why it's wrong here
DNS is not involved in pinging an IP address.
- ✓
The router between subnets
Why this is correct
The router must have a route to the server's subnet; without it, traffic cannot be forwarded.
- ✗
The server's firewall
Why it's wrong here
A firewall could block traffic, but the ping failure is more likely due to lack of routing.
- ✗
The switch
Why it's wrong here
Switches forward frames based on MAC addresses and do not route between subnets.
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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.