Objective 5.012% of exam

Service Configuration

LFCS Practice Questions

Service Configuration is 12% of the LFCS and covers managing systemd units, networking, and core network services on Linux. The exam tests this through live performance-based tasks: you start, enable, mask, or troubleshoot units with systemctl, configure hostname and DNS resolution, and set up services such as SSH, HTTP, NFS, or chrony, then confirm they persist across reboot.

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What this objective tests

LFCS Service Configuration — Key Topics

Start, enable, mask, and troubleshoot units with systemctl, configure hostname and DNS via hostnamectl and /etc/resolv.conf, and set up services like sshd, httpd, and chronyd. The critical skill is diagnosing failed units with systemctl status and journalctl.

Starting, stopping, enabling, and masking systemd units with systemctl and journalctl
Configuring persistent network settings, hostname, and name resolution on Linux
Setting up and securing SSH server access, keys, and sshd_config options
Deploying services like Apache httpd, NFS exports, or chrony time sync

Common exam traps

Where candidates lose marks on Service Configuration

⚠Running systemctl start without enable, so the service does not survive a reboot during grading
⚠Editing sshd_config or exports without reloading or restarting the daemon, leaving changes inactive
⚠Using runtime-only ip or hostname commands instead of persistent config files, so settings vanish after reboot

LFCS Service Configuration — Practice Questions

30 questions from this objective · 12% of your LFCS exam

Question 2mediummultiple choice

Service Configuration

LFCS Service Configuration — Key Topics

Where candidates lose marks on Service Configuration

LFCS Service Configuration — Practice Questions

An administrator wants to ensure that a custom service (myapp.service) starts only after the network is available and the PostgreSQL database service is running. Which systemd unit file directive should be used?

Which TWO statements are true about systemd service unit files? (Choose two.)

Match each Linux process signal to its numeric value.

A system administrator wants to limit the CPU usage of a service. Which systemd resource control directive should be used?

To ensure a service starts only after /var/lib/mysql is mounted, which directive should be used in the unit file?

A service that was once enabled is now failing to start. The administrator wants to immediately disable it to prevent boot delays. Which command sequence is correct?

Which TWO commands can be used to check the status of a service?

Based on the exhibit, what is the correct interpretation?

Exhibit

Which of the following statements is true about this unit?

Exhibit

What can be concluded from the log?

Exhibit

A system administrator is debugging why a service named 'myapp.service' fails to start. He runs 'systemctl status myapp.service' and sees the status 'failed' with details 'Exit code: 1' and 'Failed with result exit-code'. Which command should be used next to view the full log of the service?

A service unit file includes the following: [Install] WantedBy=multi-user.target. What does this directive accomplish?

Which two commands produce output that includes the current runlevel or target? (Choose two.)

Which two statements are true about systemd socket activation? (Choose two.)

Which three of the following are valid reasons to use 'systemctl mask' instead of 'systemctl disable'? (Choose three.)

Refer to the exhibit. What is the most likely cause of the sshd service failure?

Exhibit

A custom systemd service unit needs to be configured so that it automatically restarts if it exits with a non-zero exit code, but does not restart if it is stopped cleanly by an administrator. Which two directives should be used? (Choose two.)

A system administrator configures a web server using systemd. After creating a custom service unit file, the administrator runs `systemctl daemon-reload` but the service still fails to start with a 'Unit not found' error. What is the most likely cause?

A server runs a custom application that listens on TCP port 8080. The administrator wants to ensure the application starts automatically on boot and restarts if it crashes. Which systemd unit file directive should be used to achieve the restart behavior?

An administrator needs to configure a service to run as a non-root user for security reasons. Which systemd unit file directive accomplishes this?

All LFCS Objectives

Service Configuration

LFCS Service Configuration — Key Topics

Where candidates lose marks on Service Configuration

LFCS Service Configuration — Practice Questions

An administrator wants to ensure that a custom service (myapp.service) starts only after the network is available and the PostgreSQL database service is running. Which systemd unit file directive should be used?

Which TWO statements are true about systemd service unit files? (Choose two.)

Match each Linux process signal to its numeric value.

A system administrator wants to limit the CPU usage of a service. Which systemd resource control directive should be used?

To ensure a service starts only after /var/lib/mysql is mounted, which directive should be used in the unit file?

A service that was once enabled is now failing to start. The administrator wants to immediately disable it to prevent boot delays. Which command sequence is correct?

Which TWO commands can be used to check the status of a service?

Based on the exhibit, what is the correct interpretation?

Exhibit

Which of the following statements is true about this unit?

Exhibit

What can be concluded from the log?

Exhibit

A system administrator is debugging why a service named 'myapp.service' fails to start. He runs 'systemctl status myapp.service' and sees the status 'failed' with details 'Exit code: 1' and 'Failed with result exit-code'. Which command should be used next to view the full log of the service?

A service unit file includes the following: [Install] WantedBy=multi-user.target. What does this directive accomplish?

Which two commands produce output that includes the current runlevel or target? (Choose two.)

Which two statements are true about systemd socket activation? (Choose two.)

Which three of the following are valid reasons to use 'systemctl mask' instead of 'systemctl disable'? (Choose three.)

Refer to the exhibit. What is the most likely cause of the sshd service failure?

Exhibit

A custom systemd service unit needs to be configured so that it automatically restarts if it exits with a non-zero exit code, but does not restart if it is stopped cleanly by an administrator. Which two directives should be used? (Choose two.)

A system administrator configures a web server using systemd. After creating a custom service unit file, the administrator runs `systemctl daemon-reload` but the service still fails to start with a 'Unit not found' error. What is the most likely cause?

A server runs a custom application that listens on TCP port 8080. The administrator wants to ensure the application starts automatically on boot and restarts if it crashes. Which systemd unit file directive should be used to achieve the restart behavior?

An administrator needs to configure a service to run as a non-root user for security reasons. Which systemd unit file directive accomplishes this?

All LFCS Objectives