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Objective 1.5XK0-005

1.5 Given a scenario, use the appropriate networking tools or configuration files.

Objective 1.5 sits in System Management, which carries 32% of the Linux+ exam. The questions below are original, written from the official objective title above, and each explanation cites the CompTIA page it rests on.

Objective title verbatim from the official objectives. CompTIA exam page ↗

A worked example

Shown solved, with the whole explanation open: this is what every question here carries.

1-5System ManagementModerate

An engineer adds a fourth nameserver line to /etc/resolv.conf for extra redundancy. What does the resolver do with it?

Rejects the whole file as invalidExtra entries do not invalidate the file.
Queries it first as the most recent entryOrder is as listed, and a fourth entry is past the cap regardless.
Uses it only when the first three time outFallback happens within the first three, never reaching a fourth.
Ignores it; only three name servers are usedCorrect · your answerCorrect. The limit is three; extras are ignored.

Correct.

Concept

The resolver reads a bounded list of name servers, and entries past the bound simply never participate.

Why D

Up to MAXNS name servers, currently three, may be listed; a fourth line is beyond the limit and is not used.

Source

#dns#resolv-conf

Now you: objective 1.5 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

1-5System ManagementModerate

Three nameserver entries are configured. Monitoring shows nearly all queries land on the first server. Why?

Sample question 2 of 3

1-5System ManagementHard

A team wants queries spread evenly across the listed name servers instead of hammering the first. Which option does that?

Sample question 3 of 3

1-5System ManagementModerate

A minimal container has no /etc/resolv.conf at all, yet name resolution still works. What is the resolver doing?

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Read the sources

These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.

More objectives in System Management