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FC0-U71 Practice Question: A small business has a single server running…
A small business has a single server running Windows Server 2019 that acts as a domain controller, file server, and DHCP server. The server has a single network interface with IP address 192.168.1.10/24. The office has 30 client computers running Windows 10. All clients obtain IP addresses automatically. The network uses a single unmanaged switch. The internet connection is provided by a cable modem with IP 192.168.1.1. The server is configured with a static IP of 192.168.1.10, and the DHCP scope is 192.168.1.100-192.168.1.200. Recently, users have reported that they cannot access the internet. The technician checks that the cable modem is online and that the server can ping the modem. The technician runs 'ipconfig /all' on a client and sees: IP: 192.168.1.101, Subnet: 255.255.255.0, Default Gateway: 192.168.1.10, DNS: 192.168.1.10. The client can ping the server (192.168.1.10) but cannot ping the modem (192.168.1.1). What is the most likely cause?
⚠ Common exam trap
Test-takers frequently assume the server can act as a router because it is a domain controller and file server, but without enabling routing services (like RRAS), the server will not forward traffic between subnets or to the internet.
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
✓
Change the DHCP scope option for the default gateway to 192.168.1.1
The DHCP scope is configured with the default gateway option set to 192.168.1.10 (the server's IP), but the actual default gateway for internet access is the cable modem at 192.168.1.1. Since clients receive their gateway via DHCP, they are sending all off-subnet traffic to the server, which is not configured to route to the internet. Changing the DHCP scope option for the default gateway to 192.168.1.1 will allow clients to route internet traffic through the modem.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable the Windows Firewall on the server to allow traffic
Why it's wrong here
Firewall is not the issue; clients can ping the server.
- ✗
Replace the cable modem as it is not routing traffic correctly
Why it's wrong here
The modem is reachable from the server, so it is working.
- ✗
Configure the DNS server to forward queries to 8.8.8.8
Why it's wrong here
The problem is routing, not DNS resolution.
- ✓
Change the DHCP scope option for the default gateway to 192.168.1.1
Why this is correct
Clients are getting the wrong gateway; they need the modem's IP.
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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.