easyMultiple ChoiceObjective-mapped
FC0-U71 Practice Question: That their computer is unable to connect to the…
A user reports that their computer is unable to connect to the internet, but other devices on the same network work fine. Which of the following is the MOST likely cause?
⚠ Common exam trap
Many candidates assume network issues are always logical (e.g., DNS or DHCP) and overlook the physical layer, but CompTIA tests the principle that a single-device failure with others working points to a local physical or configuration problem, not a shared infrastructure fault.
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
✓
Faulty network cable
A faulty network cable can prevent a single computer from connecting to the internet while other devices on the same network work fine. This is because the cable physically connects the computer to the network switch or router, and if it is damaged, the link may fail entirely or cause excessive packet loss, isolating only that device.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Router firewall blocking traffic
Why it's wrong here
Router firewall would block multiple devices.
- ✗
DHCP server failure
Why it's wrong here
DHCP failure would affect all devices.
- ✗
DNS server misconfiguration
Why it's wrong here
DNS issues affect name resolution, not all connectivity.
- ✓
Faulty network cable
Why this is correct
A faulty cable can cause connectivity loss for a single device.
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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.