Today’s Set
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Linux Foundation Certified System Administrator
LFCS Practice Test
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LFCS
Linux Foundation Certified System Administrator
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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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150 verified questions are in the live bank. Today’s focused 10-question set includes source-backed explanations.
Question 1 of 10
Objective 5.8
Users and Groups
Which configuration directive in sssd.conf is used to specify the LDAP server URI for an application domain?
The ldap_uri directive specifies the URL of the LDAP server. The other options are used for different purposes such as specifying the search base and Kerberos servers.
Concept tested: Users and Groups (5.8)
Question 2 of 10
Objective 4.5
Essential Commands
Which lsof option limits output to files opened by a specific process ID?
Correct answer: -p. The -p option selects files for one or more process IDs; -i is a real lsof option for network files and sockets, but it does not filter by PID.
Concept tested: Essential Commands (4.5)
Question 3 of 10
Objective 2.1
Networking
How would you display the IPv4 and IPv6 addresses assigned to all network interfaces on a Linux system?
The correct command is 'ip address show' as it displays IPv4 and IPv6 addresses assigned to all network interfaces. The option 'ifconfig -a' shows interface information but does not include IPv6 by default.
Concept tested: Networking (2.1)
Question 4 of 10
Objective 3.10
Storage
What is the purpose of the auto.master file in Linux?
Correct answer: To set up automount management consulted by autofs. The auto.master map is used to set up automount management and is consulted by the autofs service. The other options describe tasks that are unrelated or handled differently.
Concept tested: Storage (3.10)
Question 5 of 10
Objective 1.3
Operations Deployment
Which command would you use to check the current status of a systemd service like 'bluetooth'?
The correct answer is 'systemctl status bluetooth'. This command provides detailed information about the current state of a service. The other options are commands to start, enable, and restart services but do not provide the status.
Concept tested: Operations Deployment (1.3)
Question 6 of 10
Objective 5.1
Users and Groups
Which useradd option sets the login shell for a new user account?
Correct answer: -s SHELL. The -s option sets the user login shell; -G is real and useful for supplementary groups, but it does not set the shell.
Concept tested: Users and Groups (5.1)
Question 7 of 10
Objective 4.10
Essential Commands
Which command would you use to add the setuid bit to a file named 'script.sh'?
Correct answer: chmod u+s script.sh. The setuid bit is added with 'u+s', making the file executable as if it were run by its owner. The other options change group write permissions, adjust general file mode, or change ownership without affecting execution rights.
Concept tested: Essential Commands (4.10)
Question 8 of 10
Objective 2.7
Networking
What ss command option would you use to display only TCP sockets that are bound but inactive?
The --bound-inactive option shows TCP sockets that are bound but not listening, connecting, etc. The -l option only displays listening sockets.
Concept tested: Networking (2.7)
Question 9 of 10
Objective 3.9
Storage
What is required in the Linux Kernel to use remote block devices such as NBD?
The correct answer is NBD (Network Block Device) support because the Linux Kernel needs to have NBD enabled to use remote block devices like NBD. NFS, iSCSI Initiator, and SMB/CIFS are other network protocols for accessing storage but do not provide direct support for using NBD.
Concept tested: Storage (3.9)
Question 10 of 10
Objective 1.4
Operations Deployment
Which command would you use to view logs for a specific user session?
Correct answer: journalctl _SYSTEMD_CGROUP=/user.slice/user-uid.slice/session-sessionid.scope. The correct command uses '_SYSTEMD_CGROUP=' to filter logs for a specific user session. The other options are either unrelated or incorrect filtering methods.
Concept tested: Operations Deployment (1.4)
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Question 1
Operations Deployment
Operations Deployment (1.1)
Question 2
Operations Deployment
Operations Deployment (1.1)
Question 3
Operations Deployment
Operations Deployment (1.1)
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