{ "A systems administrator needs to check the statuses of all the services on a Linux server. Which of the following commands accomplishes this task?" }

A{ "systemctl is-active --services" }
B{ "systemctl list-sockets --type-services" }
C{ "systemctl is-enabled --services" }
D{ "systemctl list-units --type-services" }

Answer: D

{ "The systemctl list-units --type=service command displays all loaded service units and their statuses (running, exited, failed, etc.), allowing the administrator to check the state of all services on the server." }

{ "A systems administrator wants to review the amount of time the NetworkManager service took to start. Which of the following commands accomplishes this goal?" }

A{ "resolvectl" }
B{ "journalctl" }
C{ "systemctl daemon-reload" }
D{ "systemd-analyze blame" }

Answer: D

{ "The systemd-analyze blame command shows the startup time of each service managed by systemd, allowing the administrator to see how long NetworkManager (or any other service) took to start." }

{ "A systems administrator wants to check if the ntpd service is configured to start on startup. Which of the following commands will show that information when run?" }

A{ "systemctl is-active ntpd.service" }
B{ "systemctl stop ntpd.service" }
C{ "systemctl is-enabled ntpd.service" }
D{ "systemctl start ntpd.service" }

Answer: C

{ "After system startup, the X Window System GUI login interface is not displaying. Which of the following commands ensures that the GUI is started during the system startup process?" }

A{ "systemctl isolate graphical.target" }
B{ "systemctl unmask xwindow.service" }
C{ "systemctl enable xwindow.service" }
D{ "systemctl set-default graphical.target" }

Answer: D

{ "Setting the default target to graphical.target tells systemd to boot into the graphical interface on startup. The command systemctl set-default graphical.target makes the GUI login display automatically at boot." }

{ "Which of the following technologies is used to authenticate users on a Linux server when working in a Windows domain?" }

A{ "SSH Daemon" }
B{ "Kerberos" }
C{ "PAM" }
D{ "Samba" }

Answer: B

{ "Kerberos provides centralized, ticket-based authentication and is the core authentication mechanism used by Windows Active Directory, allowing Linux systems joined to a Windows domain to authenticate users securely." }

{ "A Linux administrator needs to change the execution frequency of a systemd timer. Which of the following commands should the administrator use after editing the timer file to make the changes effective?" }

A{ "systemctl daemon-reload" }
B{ "timedatectl --adjust-system-clock" }
C{ "systemd-ana1yze time" }
D{ "sysctl --load" }

Answer: A

{ "After modifying a systemd unit file such as a timer, this command reloads systemd’s configuration so the updated execution schedule is recognized and applied." }

{ "A systems administrator is decommissioning a service. Which of the following commands should the administrator use to make sure users cannot start the service again?" }

A{ "systemctl mask service" }
B{ "systemctl kill service" }
C{ "systemctl isolate service" }
D{ "systemctl disable service" }

Answer: A

{ "This command prevents the service from being started manually or automatically by linking it to a null target, ensuring it cannot be restarted even if another service or user attempts to start it." }

{ "A Linux administrator prepares a backup script named testBack.sh. The backup script must be executed at 3:00 p.m. every Sunday. Which of the following crontab configurations will satisfy this requirement?" }

A{ "0 * * * 15 testBack.sh" }
B{ "*/15 * * * 0 testBack.sh" }
C{ "0 15 * * 0 testBack.sh" }
D{ "* 15 * * 0 testBack.sh" }

Answer: C

{ "This cron entry schedules the script to run at minute zero of hour fifteen every Sunday, which corresponds to 3:00 p.m. each week." }

{ "A Linux user needs to authenticate to a Windows Active Directory domain. Which of the following configuration files contains the domain configuration details?" }

A{ "sssd.conf" }
B{ "auditd.conf" }
C{ "pam.conf" }
D{ "smb.conf" }

Answer: A

{ "The sssd.conf file contains the configuration for System Security Services Daemon, including Active Directory domain details used for authenticating Linux users against a Windows Active Directory domain." }

{ "A Linux systems administrator makes updates to systemd-managed service configuration files. Which of the following commands should the administrator execute in order to implement the changes?" }

A{ "systemctl enable" }
B{ "systemctl start" }
C{ "systemctl restart" }
D{ "systemctl daemon-reload" }

Answer: D

{ "systemctl daemon-reload tells systemd to reread unit files and reload its manager configuration so changes made to service configuration files are recognized." }

{ "An administrator logs in to a Linux server and notices the clock is 37 minutes fast. Which of the following commands will fix the issue?" }

A{ "hwclock" }
B{ "ntpdate" }
C{ "timedatectl" }
D{ "ntpd -q" }

Answer: B

{ "The ntpdate command synchronizes the system clock with a remote NTP server immediately, correcting any significant time drift. This is ideal for one-time corrections. For example: bash CopyEdit ntpdate pool.ntp.org" }

{ "Which of the following commands is used to ensure a service starts automatically at boot on a system using systemd?" }

A{ "systemctl start httpd" }
B{ "systemctl enable httpd" }
C{ "systemctl status httpd" }
D{ "systemctl reload httpd" }

Answer: B

{ "The correct answer is B. systemctl enable httpd because it configures a service to start automatically during system boot in systems that use systemd as the init system. The enable command creates the necessary symbolic links between the service unit file and the appropriate target (such as multi- user.target), ensuring the service is launched when the system starts." }

{ "A Linux user needs to authenticate to a Windows Active Directory domain. Which of the following configuration files contains the domain configuration details?" }

A{ "sssd.conf" }
B{ "krb5.conf" }
C{ "pam.conf" }
D{ "smb.conf" }

Answer: A

{ "In modern Linux enterprise environments, integrating with Windows Active Directory (AD) is a common requirement for centralized identity management. According to CompTIA Linux+ V8, the System Security Services Daemon (SSSD) is the recommended way to handle authentication and authorization against remote providers like AD or LDAP. The sssd.conf file (typically located in /etc/sssd/) is the primary configuration file for this service. It contains the essential \"domain configuration details,\" including: The AD domain name. The authentication provider (e.g., id_provider = ad). The URI of the domain controllers. Caching settings for offline login. SSSD provides a unified interface that manages the communication between the Linux system and the AD domain, simplifying the authentication stack." }

{ "A Linux administrator is investigating the reason a system timer is not running every night at midnight. The administrator reviews the following unit file: Which of the following modifications should the administrator make in the unit file? (Choose two.)" }

      
        { "[Unit]\nDescription=Nightly backup timer\n\n[Timer]\nOnCalendar=*-*-01 00:00:00\nRandomizedDelaySec=10800\nPersistent=true\n\n[Install]\nWantedBy=timers.target" }

Choose two.

A{ "Remove RandomizedDelaySec=10800." }
B{ "Add WakeSystem=Midnight." }
C{ "Change OnCalendar to*-*-* 00:00:00." }
D{ "Add OnCalendar=*-*-* daily." }
E{ "Add AccuracySec=1." }
F{ "Remove OnCalendar=*-*-01 00:00:00." }

Answer: CF

{ "Changing OnCalendar to *-*-* 00:00:00 ensures the timer fires every day at midnight rather than only on the first of the month. Removing the existing OnCalendar=*-*-01 00:00:00 entry clears the incorrect monthly trigger so that the corrected daily schedule takes effect." }

{ "A Linux administrator needs to schedule a system backup script /usr/local/bin/backup.sh to run every night at 1:30 a.m. Which of the following entries should the administrator add to system crontab to achieve the goal?" }

A{ "1:30 * * * /usr/local/bin/backup.sh" }
B{ "1 30 * * * /usr/local/bin/backup.sh" }
C{ "30 1 * * * /usr/local/bin/backup.sh" }
D{ "* * * 1 30 /usr/local/bin/backup.sh" }

Answer: C

{ "The crontab schedule format is minute hour day-of-month month day-of-week. To run at 1:30 AM every day, you specify 30 for minutes and 1 for hours: 30 1 * * * /usr/local/bin/backup.sh" }

{ "A systems administrator engineer wants to configure a Linux server's time zone to America/Chicago. The engineer verifies that the server's time zone is configured for Asia/Tokyo: Which of the following commands should the engineer execute to make this change?" }

A{ "date configure -set-timezone America/Chicago" }
B{ "set-timezone -config America/Chicago" }
C{ "time date set America/Chicago" }
D{ "timedatect1 set-timezone America/Chicago" }

Answer: D

{ "The timedatectl utility manages system time settings under systemd; using its set-timezone command updates the server’s timezone to America/Chicago." }

{ "A web application that uses a database for managing logins needs to be set up so that the database is running before the web server starts. A Linux administrator, who is troubleshooting the issue, runs a few commands and receives the following output: Which of the following should the Linux administrator do to ensure the database starts first?" }

      
        { "# systemctl cat httpd.service | head -4\n[Unit]\nDescription=The Apache HTTP Server\nAfter=network.target remote-fs.target nss-lookup.target\n\n# systemctl cat mariadb.service | head -3\n[Unit]\nDescription=MariaDB 10.5 database server\nAfter=network.target" }

A{ "Enable the HTTPD service using the httpd command." }
B{ "Add mariadb. service to the Wants for the HTTPD service configuration" }
C{ "Add Before=httpd. service to die MariaDB configuration." }
D{ "Add mariadb. service to the HTTPD service configuration." }

Answer: C

{ "This ensures that systemd starts the MariaDB service before the HTTPD service, enforcing the correct order based on dependency rather than relying solely on After= directives in the web server unit file." }

{ "After making a configuration change to an Apache web server, an administrator needs to reload the service. However, sudo access was only granted to the killall command. Which of the following commands should the administrator use to load the new configuration?" }

A{ "sudo killall –HUP httpd" }
B{ "sudo killall –reload httpd" }
C{ "sudo killall –9 httpd" }
D{ "sudo killall –TERM httpd" }

Answer: A