Linux Foundation Certified System Administrator

LFCS Practice Test

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Questions updated at Jul 18, 2026, 1:30 PM CDT

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Today's 10 LFCS questions

Use this LFCS practice test to review Linux Foundation Certified System Administrator. Questions rotate daily and each explanation links to the source used to validate the answer.

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Question 1 of 10

Objective 4.2 Essential Commands

Which systemd unit directive declares that another unit is required for this unit?

Concept tested:

Source:systemd.unit manual

Question 2 of 10

Objective 2.10 Networking

Which nft command creates an IPv4 table named mytable?

Concept tested:

Question 3 of 10

Objective 3.10 Storage

An administrator is configuring autofs to manage network shares. What is the primary function of the auto.master file within the autofs framework?

Concept tested:

Question 4 of 10

Objective 4.11 Essential Commands

In chown syntax, which separator can distinguish the owner name from the group name?

Concept tested:

Question 5 of 10

Objective 1.5 Operations Deployment

An administrator needs to schedule a set of automated tasks. Which file format should they use?

Concept tested:

Question 6 of 10

Objective 1.8 Operations Deployment

Which DNF option selects a specific repository for an operation?

Concept tested:

Question 7 of 10

Objective 5.1 Users and Groups

Which useradd option sets the new user's login shell?

Concept tested:

Question 8 of 10

Objective 2.14 Networking

An IT team is setting up an NGINX configuration to handle incoming traffic for a new application. Which NGINX block is used to define a named group of backend servers for load balancing?

Concept tested:

Question 9 of 10

Objective 5.4 Users and Groups

Which per-user Bash file is commonly read for a login shell?

Concept tested:

Question 10 of 10

Objective 3.11 Storage

Which df option omits selected filesystem types from the report?

Concept tested:

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Official exam resources

Use these official Linux Foundation resources alongside the daily practice set. They cover the provider's own exam page, study guide, or prep material.

Certification Linux Foundation LFCS certification Docs systemd documentation

Need adjacent Linux Foundation practice pages too? Linux Foundation practice hub.

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The free daily LFCS set includes crawlable question text, answer choices, correct answer labels, objective mapping, and source links. Only the first SEO card includes answer explanations and any extra learning features. Pro-only bank questions stay locked; this section mirrors only the 10 free daily questions already shown on this page.

Question 1 Which systemd unit directive declares that another unit is required for this unit?

Answer choices

A. Requires
B. After
C. WantedBy
D. Before

Correct answer

Requires

Requires is correct because it declares a requirement dependency on another unit. After and Before control ordering, while WantedBy is used in the [Install] section for enablement relationships.

Wrong-answer review

B. After: After controls startup ordering but does not create the requirement by itself.
C. WantedBy: WantedBy is used when enabling units under a target.
D. Before: Before controls ordering in the opposite direction, but it targets a different need than the scenario's goal.

Extra learning features

Why candidates miss this

The directive 'After' is often misunderstood to establish a dependency, but it only specifies the order in which units start. Systemd unit files use 'After' to define startup ordering, not to declare a hard requirement. The 'Requires' directive, in contrast, ensures that a unit will not start unless the specified unit is already active, which is the correct behavior for this scenario. Likely wrong answer: After Review focus: systemd.unit

Objective/domain: Essential Commands

Source: systemd.unit manual

Question 2 Which nft command creates an IPv4 table named mytable?

Answer choices

A. iptables -N mytable
B. nft add table ip mytable
C. ip route add table mytable
D. firewalld --new-table=mytable

Correct answer

nft add table ip mytable

Objective/domain: Networking

Source: nft(8) Linux manual page

Question 3 An administrator is configuring autofs to manage network shares. What is the primary function of the auto.master file within the autofs framework?

Answer choices

A. To define specific mount points for NFS shares
B. To configure network interfaces for automounting
C. To set up automount management consulted by autofs
D. To manage user home directories

Correct answer

To set up automount management consulted by autofs

Objective/domain: Storage

Source: auto.master(5) Linux manual page

Question 4 In chown syntax, which separator can distinguish the owner name from the group name?

Answer choices

A. an asterisk
B. a comma
C. a colon
D. a semicolon

Correct answer

a colon

Objective/domain: Essential Commands

Source: chown(1) Linux manual page

Question 5 An administrator needs to schedule a set of automated tasks. Which file format should they use?

Answer choices

A. crontab
B. cronfile
C. scheduletab
D. joblist

Correct answer

crontab

Objective/domain: Operations Deployment

Source: crontab(5) Linux manual page

Question 6 Which DNF option selects a specific repository for an operation?

Answer choices

A. --all
B. --list
C. --repo
D. --search

Correct answer

--repo

Objective/domain: Operations Deployment

Source: DNF command reference

Question 7 Which useradd option sets the new user's login shell?

Answer choices

A. -m
B. -r
C. -s SHELL
D. -G GROUPS

Correct answer

-s SHELL

Objective/domain: Users and Groups

Source: useradd(8) Linux manual page

Question 8 An IT team is setting up an NGINX configuration to handle incoming traffic for a new application. Which NGINX block is used to define a named group of backend servers for load balancing?

Answer choices

A. upstream
B. backend_servers
C. proxy_group
D. server_pool

Correct answer

upstream

Objective/domain: Networking

Source: NGINX reverse proxy admin guide

Question 9 Which per-user Bash file is commonly read for a login shell?

Answer choices

A. /etc/profile
B. ~/.bash_profile
C. ~/.bashrc
D. /etc/bash.bashrc

Correct answer

~/.bash_profile

Objective/domain: Users and Groups

Source: bash(1) Linux manual page

Question 10 Which df option omits selected filesystem types from the report?

Answer choices

A. --exclude
B. -a, --all
C. -B, --block-size=SIZE
D. --include

Correct answer

--exclude

Objective/domain: Storage

Source: df(1) Linux manual page

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