Linux System Administration Basics MCQ (Module 1)

Q1 What is the default port number for SSH?

A 21B 22C 23D 80

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

A lsB pwdC cdD dir

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’

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

A ls -aB lsC ls -lD ls -la

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

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

A ifconfigB ipconfigC netstatD iwconfig

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

A File compressionB Search text within filesC Disk partitioningD Package installation

Q8 Which directory contains the system’s log files?

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

Q9 What does the command ‘sudo’ stand for?

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

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

A ext4B NTFSC FAT32D F2FS

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

A viewB catC touchD ls

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

A findB locateC whereisD which

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

Q14 Which command is used to display disk usage?

A duB dfC diskfreeD diskusage

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

A Delete filesB Remove directoriesC Terminate processesD Manage users

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

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

Q17 Which command is used to edit text files interactively?

A edB sedC awkD vim

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

A File editingB System rebootC Package managementD User management

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

Q20 Which file contains the system’s DNS settings?

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

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

Q22 Which directory is intended for temporary files in Linux?

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

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

Q24 Which command will display all currently running processes?

A ps -efB topC lsprocD run

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

Q26 Which file defines the system’s locale settings?

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

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

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

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

Q29 Which command is used to change file ownership?

A chownB chmodC chgrpD cnmod

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

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

A /rootB /C /homeD /usr

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

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

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

Q34 Which command will display the kernel version?

A uname -rB kverC linuxversionD kernel

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

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

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

A netstatB ifconfigC tcpdumpD ip monitor

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

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

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

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

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

A memshowB freeC df -hD du -h

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

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

A zipB compressC gzipD tar

Q42 What does the ‘ifup’ command do?

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

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

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

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

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

Q45 Which command will forcefully unmount a filesystem?

A umount -fB ejectC mount -rD fdisk

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

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

Q47 What does the ‘systemctl’ command manage?

A File systemsB System services and unitsC User accountsD Network configurations

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

Q49 What does the ‘man’ command do?

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

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

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

A headB lessC tailD cat

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

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

Q53 Which directory contains the executable files for installed programs?

A /varB /etcC /binD /tmp

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

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

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

A usermod -aGB groupaddC useradd -GD gpasswd -a

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

A Remote file synchronizationB System resource monitoringC File compressionD Package installation

Q58 What does the ‘/dev’ directory contain?

A User documentsB Device filesC System logsD Downloaded packages

Q59 Which command is used to display the routing table?

A routeB netstat -rC ip route showD ifconfig

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

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

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

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

Q64 What does the ‘mount’ command do?

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

Q65 Which file contains local DNS entries for hostname resolution?

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

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

A topB psC killD renice

Q67 Which command is used to check filesystem integrity?

A fsckB chkdskC fdiskD mkfs

Q68 What does the ‘alias’ command do?

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

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

A Disk DuplicationB Disk DestructionC Data DescriptionD Disk Defragmentation

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

A ifconfig -aB netstat -iC ip addr showD iwconfig

Q71 What does the ‘jobs’ command do?

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

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

A dateB timeC clockD timedate