Linux System Administration Basics MCQ (Module 1)

By RahulApril 15, 2024Updated April 26, 2025015 min read

Welcome to Module 1 of our Linux System Administration Multiple-Choice Questions series! This module is designed as your first step into the world of Linux system administration. Here, you will encounter a range of questions that cover basic concepts and essential commands fundamental to managing Linux systems. Perfect for beginners or as a refresher for seasoned professionals, this module sets the groundwork for more advanced topics in subsequent modules.

Q1 What is the default port number for SSH?

A 21B 22C 23D 80

Correct Answer: B
The default port number for SSH (Secure Shell) is 22.

Q2 Which command is used to display the current directory in Linux?

A lsB pwdC cdD dir

Correct Answer: B
The ‘pwd’ (print working directory) command is used to display the current directory in Linux.

Q3 What does the ‘chmod +x filename’ command do?

A Changes the file to executableB Removes the executable permissionC Displays the file’s permissionsD Changes the file owner to ‘x’

Correct Answer: A
The ‘chmod +x filename’ command adds executable permissions to the file.

Q4 Which command is used to list all files and directories, including hidden ones?

A ls -aB lsC ls -lD ls -la

Correct Answer: A
The ‘ls -a’ command lists all files and directories in the current directory, including hidden ones.

Q5 What is the purpose of the ‘/etc/fstab’ file?

A Configures network interfacesB Stores user passwordsC Lists devices and their mount pointsD Contains system log files

Correct Answer: C
The ‘/etc/fstab’ file contains a list of devices and their mount points.

Q6 Which command will show the system’s current IP address?

A ifconfigB ipconfigC netstatD iwconfig

Correct Answer: A
The ‘ifconfig’ command is used to configure, control, and query TCP/IP network interface parameters.

Q7 What is the use of the ‘grep’ command?

A File compressionB Search text within filesC Disk partitioningD Package installation

Correct Answer: B
The ‘grep’ command is used to search for text within files.

Q8 Which directory contains the system’s log files?

A /etc/logB /var/logC /usr/logD /home/log

Correct Answer: B
The ‘/var/log’ directory contains the system’s log files.

Q9 What does the command ‘sudo’ stand for?

A Switch user and doB Super user doC Super user deleteD Switch user delete

Correct Answer: B
‘sudo’ stands for ‘super user do’, allowing a permitted user to execute a command as the superuser or another user.

Q10 Which file system is specifically designed for flash memory devices?

A ext4B NTFSC FAT32D F2FS

Correct Answer: D
F2FS (Flash-Friendly File System) is specifically designed for flash memory devices.

Q11 What is the command to view the content of a file?

A viewB catC touchD ls

Correct Answer: B
The ‘cat’ command is used to view the content of a file.

Q12 Which command is used to find the location of a command?

A findB locateC whereisD which

Correct Answer: D
The ‘which’ command is used to find the location of a command.

Q13 What is the significance of the ‘/home’ directory?

A It contains the Linux kernelB It stores system configuration filesC It is the root user’s home directoryD It contains user directories

Correct Answer: D
The ‘/home’ directory contains the personal directories of all users.

Q14 Which command is used to display disk usage?

A duB dfC diskfreeD diskusage

Correct Answer: B
The ‘df’ command is used to display disk space usage on all mounted filesystems.

Q15 What is the function of the ‘kill’ command?

A Delete filesB Remove directoriesC Terminate processesD Manage users

Correct Answer: C
The ‘kill’ command is used to terminate processes.

Q16 What does the ‘/etc/shadow’ file contain?

A System log filesB Encrypted user passwordsC Network configurationD Package management logs

Correct Answer: B
The ‘/etc/shadow’ file contains encrypted user passwords.

Q17 Which command is used to edit text files interactively?

A edB sedC awkD vim

Correct Answer: D
‘vim’ is a powerful text editor used to create and modify text files interactively.

Q18 What is the primary function of the ‘apt-get’ command?

A File editingB System rebootC Package managementD User management

Correct Answer: C
The ‘apt-get’ command is used for package management in Debian and Ubuntu systems.

Q19 What does the command ‘df -h’ display?

A Disk free space in human-readable formatB Directory file hierarchyC Disk files hiddenD Disk fragmentation health

Correct Answer: A
The ‘df -h’ command displays disk free space in a human-readable format, with sizes in KB, MB, or GB.

Q20 Which file contains the system’s DNS settings?

A /etc/resolv.confB /etc/dns.confC /etc/network/interfacesD /etc/hosts

Correct Answer: A
The ‘/etc/resolv.conf’ file contains the system’s DNS settings.

Q21 What is the purpose of the ‘crontab’ command?

A Scheduling commands to run periodicallyB Changing file permissionsC Editing system configuration filesD Updating the system clock

Correct Answer: A
The ‘crontab’ command is used for scheduling commands to run at periodic intervals.

Q22 Which directory is intended for temporary files in Linux?

A /tmpB /var/tmpC /usr/tmpD /home/tmp

Correct Answer: A
The ‘/tmp’ directory is intended for storing temporary files.

Q23 What is the primary purpose of the ‘top’ command?

A Managing disk partitionsB Displaying real-time system processesC Editing text filesD Managing network connections

Correct Answer: B
The ‘top’ command is used for displaying real-time information about system processes.

Q24 Which command will display all currently running processes?

A ps -efB topC lsprocD run

Correct Answer: A
The ‘ps -ef’ command displays a list of all currently running processes.

Q25 What is the purpose of the ‘/var’ directory?

A Storing variable data filesB Holding system boot filesC Containing user home directoriesD Storing static files like binaries

Correct Answer: A
The ‘/var’ directory is used for storing variable data files, such as logs, databases, and email queues.

Q26 Which file defines the system’s locale settings?

A /etc/locale.confB /etc/environmentC /etc/locale.genD /etc/locale

Correct Answer: A
The ‘/etc/locale.conf’ file defines the system’s locale settings.

Q27 What does the ‘ln’ command do in Linux?

A Creates a new directoryB Lists network connectionsC Creates a link to a fileD Displays log files

Correct Answer: C
The ‘ln’ command is used to create links to files and directories.

Q28 What is the use of the ‘tar’ command?

A Tracking system resourcesB Terminating active processesC Archiving filesD Transferring files over the network

Correct Answer: C
The ‘tar’ command is used for archiving files.

Q29 Which command is used to change file ownership?

A chownB chmodC chgrpD cnmod

Correct Answer: A
The ‘chown’ command is used to change the ownership of a file or directory.

Q30 What does the ‘ping’ command do?

A Displays the path to a network hostB Sends ICMP echo requests to a hostC Measures the network bandwidthD Lists all network interfaces

Correct Answer: B
The ‘ping’ command sends ICMP echo requests to a host to measure the reachability and round-trip time.

Q31 Which directory is the root of the file system hierarchy?

A /rootB /C /homeD /usr

Correct Answer: B
The ‘/’ directory is the root of the file system hierarchy in Linux.

Q32 What does the command ‘useradd’ do?

A Displays current usersB Adds a new user to the systemC Updates a user’s informationD Deletes a user from the system

Correct Answer: B
The ‘useradd’ command is used to add a new user to the system.

Q33 What is the purpose of the ‘/boot’ directory?

A Storing temporary filesB Holding system boot filesC Containing user data filesD Archiving system logs

Correct Answer: B
The ‘/boot’ directory holds the system boot files, including the Linux kernel.

Q34 Which command will display the kernel version?

A uname -rB kverC linuxversionD kernel

Correct Answer: A
The ‘uname -r’ command displays the kernel version.

Q35 What is the function of the ‘iptables’ command?

A File compressionB Network firewall configurationC Internet protocol tables managementD Interactive process termination

Correct Answer: B
The ‘iptables’ command is used for network firewall configuration.

Q36 Which command is used to monitor real-time network traffic?

A netstatB ifconfigC tcpdumpD ip monitor

Correct Answer: C
The ‘tcpdump’ command is used to monitor real-time network traffic.

Q37 What does the ‘/etc/passwd’ file contain?

A System log filesB User account informationC Network configuration settingsD System password policies

Correct Answer: B
The ‘/etc/passwd’ file contains user account information.

Q38 What is the command to update all packages on a Debian-based system?

A yum updateB apt-get upgradeC dnf upgradeD pacman -Syu

Correct Answer: B
The ‘apt-get upgrade’ command is used to update all packages on a Debian-based system.

Q39 Which command displays the amount of memory used and available on the system?

A memshowB freeC df -hD du -h

Correct Answer: B
The ‘free’ command displays the total amount of free and used physical and swap memory in the system.

Q40 What is the purpose of the ‘/etc/hostname’ file?

A Storing the system’s network configurationB Defining the system’s timezoneC Containing the system’s host nameD Listing available network interfaces

Correct Answer: C
The ‘/etc/hostname’ file contains the system’s host name.

Q41 Which command is used to compress files using gzip compression?

A zipB compressC gzipD tar

Correct Answer: C
The ‘gzip’ command is used to compress files using gzip compression.

Q42 What does the ‘ifup’ command do?

A Displays the system’s uptimeB Brings a network interface upC Increases CPU frequencyD Configures IP addresses

Correct Answer: B
The ‘ifup’ command is used to bring a network interface up.

Q43 Which command lists all installed packages in Debian-based systems?

A rpm -qaB dpkg -lC yum list installedD pacman -Q

Correct Answer: B
The ‘dpkg -l’ command lists all installed packages in Debian-based systems.

Q44 What is the primary function of the ‘/proc’ directory?

A Storing process informationB Holding configuration filesC Containing user data filesD Archiving system logs

Correct Answer: A
The ‘/proc’ directory is a virtual filesystem that contains information about system processes and other system information.

Q45 Which command will forcefully unmount a filesystem?

A umount -fB ejectC mount -rD fdisk

Correct Answer: A
The ‘umount -f’ command forcefully unmounts a filesystem.

Q46 What is the function of the ‘lsblk’ command?

A Lists block devicesB Lists loaded kernel modulesC Shows disk usageD Displays active network connections

Correct Answer: A
The ‘lsblk’ command lists information about all available or the specified block devices.

Q47 What does the ‘systemctl’ command manage?

A File systemsB System services and unitsC User accountsD Network configurations

Correct Answer: B
The ‘systemctl’ command is used to examine and control the systemd system and service manager.

Q48 Which command is used to update the package list in Debian-based systems?

A apt-get updateB apt-get upgradeC yum updateD dnf upgrade

Correct Answer: A
The ‘apt-get update’ command is used to update the package list in Debian-based systems.

Q49 What does the ‘man’ command do?

A Manages user accountsB Displays the manual pages for commandsC Manages disk partitionsD Monitors system performance

Correct Answer: B
The ‘man’ command displays the manual pages for commands, providing detailed documentation.

Q50 What is the significance of the ‘/etc’ directory?

A It contains executable binariesB It stores temporary filesC It holds configuration filesD It stores user data files

Correct Answer: C
The ‘/etc’ directory holds configuration files for the system and applications.

Q51 Which command can be used to view the end of a file?

A headB lessC tailD cat

Correct Answer: C
The ‘tail’ command is used to view the end of a file, and it’s especially useful for monitoring log files.

Q52 What is the purpose of the ‘wget’ command?

A Web browsingB Downloading files from the internetC Web server managementD Website hosting

Correct Answer: B
The ‘wget’ command is used for downloading files from the internet, supporting HTTP, HTTPS, and FTP protocols.

Q53 Which directory contains the executable files for installed programs?

A /varB /etcC /binD /tmp

Correct Answer: C
The ‘/bin’ directory contains the executable files for user commands and essential programs.

Q54 What is the command to search for a specific package in Debian-based systems?

A apt-cache searchB apt-get findC dpkg -lD apt-list –installed

Correct Answer: A
The ‘apt-cache search’ command is used to search for a specific package in the package cache of Debian-based systems.

Q55 What does the ‘iptables -L’ command do?

A Lists all active network connectionsB Lists all usersC Lists all IP addresses on the networkD Lists all current iptables firewall rules

Correct Answer: D
The ‘iptables -L’ command lists all current iptables firewall rules.

Q56 Which command is used to add a user to a group?

A usermod -aGB groupaddC useradd -GD gpasswd -a

Correct Answer: A
The ‘usermod -aG’ command is used to add a user to a supplementary group.

Q57 What is the main purpose of the ‘rsync’ command?

A Remote file synchronizationB System resource monitoringC File compressionD Package installation

Correct Answer: A
The ‘rsync’ command is used for remote file synchronization, efficiently copying and syncing files either between local directories or between a local and a remote system.

Q58 What does the ‘/dev’ directory contain?

A User documentsB Device filesC System logsD Downloaded packages

Correct Answer: B
The ‘/dev’ directory contains device files that represent hardware components.

Q59 Which command is used to display the routing table?

A routeB netstat -rC ip route showD ifconfig

Correct Answer: C
The ‘ip route show’ command is used to display the routing table.

Q60 What does the ‘nohup’ command do?

A Increases process priorityB Deletes all user dataC Runs a command immune to hangupsD Hangs up a running process

Correct Answer: C
The ‘nohup’ command is used to run a command immune to hangups, with output to a non-tty.

Q61 Which command is used to display available disk space on file systems in a human-readable format?

A du -hB df -hC lsblk -fD fdisk -l

Correct Answer: B
The ‘df -h’ command displays available disk space on mounted file systems in a human-readable format.

Q62 What does the command ‘history’ do?

A Displays the command line historyB Deletes all commands enteredC Repeats the last command executedD Saves the current session’s commands

Correct Answer: A
The ‘history’ command displays the command line history, allowing users to see the commands that have been entered previously.

Q63 What is the main use of the ‘ssh-keygen’ command?

A Generating network keysB Generating SSH authentication keysC Recovering lost SSH keysD Generating system restore keys

Correct Answer: B
The ‘ssh-keygen’ command is used for generating SSH authentication keys, allowing secure remote login without passwords.

Q64 What does the ‘mount’ command do?

A Mounts a storage device or filesystemB Checks disk spaceC Creates a new filesystemD Deletes a filesystem

Correct Answer: A
The ‘mount’ command is used to mount a storage device or filesystem, making it accessible and attaching it to an existing directory structure.

Q65 Which file contains local DNS entries for hostname resolution?

A /etc/dns.confB /etc/resolv.confC /etc/hostsD /etc/network/interfaces

Correct Answer: C
The ‘/etc/hosts’ file contains local DNS entries for hostname resolution, mapping hostnames to IP addresses.

Q66 What is the command to change the priority of a running process?

A topB psC killD renice

Correct Answer: D
The ‘renice’ command is used to change the priority of a running process.

Q67 Which command is used to check filesystem integrity?

A fsckB chkdskC fdiskD mkfs

Correct Answer: A
The ‘fsck’ command is used to check and optionally repair one or more Linux filesystems.

Q68 What does the ‘alias’ command do?

A Finds files with similar namesB Creates a shortcut for a commandC Renames filesD Hides file extensions

Correct Answer: B
The ‘alias’ command is used to create a shortcut for a command, allowing a user to invoke longer commands using shorter and simpler aliases.

Q69 What is the purpose of the ‘dd’ command?

A Disk DuplicationB Disk DestructionC Data DescriptionD Disk Defragmentation

Correct Answer: A
The ‘dd’ command is used for disk duplication and conversion, allowing for copying and converting data between files, devices, and partitions.

Q70 Which command is used to display all active network interfaces?

A ifconfig -aB netstat -iC ip addr showD iwconfig

Correct Answer: C
The ‘ip addr show’ command is used to display all active network interfaces, including detailed information about each.

Q71 What does the ‘jobs’ command do?

A Lists current jobsB Schedules cron jobsC Manages system tasksD Shows system performance jobs

Correct Answer: A
The ‘jobs’ command lists the jobs that are currently running or stopped in the background.

Q72 What is the command to display the current system date and time?

A dateB timeC clockD timedate

Correct Answer: A
The ‘date’ command is used to display the current system date and time.

You have now completed Module 1 of the Linux System Administration MCQ series. To continue building on this foundation and delve into intermediate topics, please proceed to Linux System Admin MCQ Module 2.

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