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LFCS Networking Practice Question
Order the steps to troubleshoot a DNS resolution issue from a Linux client.
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
✓
Check DNS configuration, then test DNS resolution, then check network connectivity, then check firewall settings
The correct sequence for troubleshooting DNS resolution from a Linux client starts with verifying the local DNS configuration (e.g., /etc/resolv.conf), then testing resolution using tools like nslookup or dig. Next, check network connectivity to the DNS server (ping), and finally examine firewall rules that might block UDP/TCP port 53. This logical progression isolates the problem systematically, avoiding wasted effort on unrelated checks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Check DNS configuration, then test DNS resolution, then check network connectivity, then check firewall settings
Why this is correct
This is the correct order because you start by verifying the DNS configuration (e.g., /etc/resolv.conf), then test resolution with tools like nslookup, then check general connectivity (ping), and finally examine firewall rules that might block DNS traffic.
- ✗
Check firewall settings, then check network connectivity, then test DNS resolution, then check DNS configuration
Why it's wrong here
This is incorrect because checking the firewall first is premature; you should verify the DNS configuration and test basic connectivity before assuming the firewall is the issue.
- ✗
Test DNS resolution, then check DNS configuration, then check firewall settings, then check network connectivity
Why it's wrong here
This is incorrect because you should check the DNS configuration before testing resolution; otherwise, you might misdiagnose a misconfigured resolver as a network problem.
- ✗
Check network connectivity, then check DNS configuration, then test DNS resolution, then check firewall settings
Why it's wrong here
This is incorrect because checking connectivity before DNS configuration is less efficient; DNS issues often stem from configuration errors, so that should be the first step.
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This LFCS question is part of Courseiva's 507-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.