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LFCS Networking Practice Question

Which TWO configuration files are commonly used to set DNS resolver settings on a Linux system?

⚠ Common exam trap

Test-takers frequently confuse /etc/hosts with a DNS resolver configuration file, but it is only a static local lookup table, not a resolver setting file.

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

✓

/etc/nsswitch.conf

/etc/nsswitch.conf controls the order of name resolution sources (e.g., files, dns, mdns) via the 'hosts' database line. Option E is correct because /etc/resolv.conf directly specifies the DNS resolver settings, including nameserver IP addresses, search domains, and options, as defined by RFC 1035.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    /etc/nsswitch.conf

    Why this is correct

    Controls order of name resolution (e.g., files, dns).

  • ✗

    /etc/hostname

    Why it's wrong here

    Sets the hostname only.

  • ✗

    /etc/sysconfig/network

    Why it's wrong here

    Contains general network settings, not DNS resolver.

  • ✗

    /etc/hosts

    Why it's wrong here

    Contains static hostname mappings.

  • ✓

    /etc/resolv.conf

    Why this is correct

    Contains nameserver and search domain settings.

Visual reference

Client Recursive Resolver Root DNS (13 root servers) TLD DNS (.com, .org, …) Authoritative example.com query IP addr answer

About these practice questions

One of 507 original LFCS practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →

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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.