Linux Questions and Answers to Practice for Certification Exam

The Linux certification covers the concepts of administration on cloud, cybersecurity, mobile, and administration. The certification is widely accepted in the IT sector and gives and edge over your peers. Our comprehensive list of Linux certification exam questions and answers will help you to recap your Linux exam preparation and quickly glance before stepping into the Linux certification exam. Taking Linux practice test with these Linux dump questions will give you confidence for improvising or to attend the Linux certification exam for achieving a passing score.

Exam Details: https://certification.comptia.org/certifications/linux#overview

Exam name: LX0-103 & LX0-104

Test Duration: 90 minutes

No. of questions: 60

Passing score: 60%

Validated against: https://certification.comptia.org/certifications

Test Format: Multiple choice

Linux Certification Cost for Exam: 438 USD

1. What is the use of sort-r command?

A. To sort the line of data in a file in reverse order.

B. To save the standard output in the file as well as display it on the terminal.

C. To count just the number of the line contained in a file.

D. None of the above.

Answer- OPTION A

Explanation- Tee command is used to save the standard output in the file as well as display it on the terminal and for counting just the number of the line contained in a file command wc-I is used. Hence, the correct option is Option A sort-r.

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2. Which layer is used to perform the routing?

A. Network layer.

B. Session layer.

C. Transport layer.

D. Data link layer.

E. All of the above.

Answer- OPTION A

Explanation- Session layer is used to manage the setup and tear down of the association between two communication endpoints. Data link layer response to a service request from the network layer above it and issues service request to the physical layer below it. Transport layer has the function of building a connection from a different host to host. Hence, the correct answer is OPTION A Network layer that helps us to guide by routine in OSI network of Architecture.

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3. Which mode is used for setting active-backup mode for fault tolerance?

A. Balance-rr or 0

B. Active-backup or 1

C. Balance-xor or 2

D. Broadcast or 3

Answer- OPTION B

Explanation- Balance-rr or 0 is used for fault tolerance and load balancing. Broadcast or 3 is used for all transmission sending to slave interfaces. Hence, OPTION B is the correct answer.

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4. For displaying the operating system name ... the command is used.

A. UNIX

B. Kernel

C. Uname

D. os

E. None of the above

Answer- OPTION C

Explanation- all other three do not command only.

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5. What is the use of Uname-r command?

A. To display the operating system name

B. To display the Unix/Linux version

C. To set terminal IO characteristics

D. To record a user login session in a file

E. None of the above

Answer- OPTION A

Explanation- For displaying the operating system name Uname command is used. To record the user login session in a file script command is used. To set terminal IO characteristics stty command is used. Hence, the right answer is OPTION B.

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6. What is the use of system call in Linux?

A. For communicating the application with the kernel.

B. To interact directly with system hardware.

C. For starting the process in Linux

D. None of the above

Answer- OPTION A

Explanation- the shell is used to interact directly with system hardware. There is the different command for starting the Linux and for communicating application with the kernel; the system call option is used. Hence the correct answer is A.

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7. Which command is used to get the information about the space of disk used in a Linux system?

a.  Df command

b. Du command

c. Both of the above

d. None of the above

Ans: a

Explanation: Since the du command is used to get the information about the space of disk used by a file in the Linux system. It is a different thing. Hence, the correct option is option A.

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8. Is history command and man command the same thing?

A. yes

B. no

C. partly true partly false

D. none of the above

Answer b

Explanation: there is a difference between both the commands. Since man command is used to find the information about the command we do not know on the other hand history command details us about the command we have already used in the past.

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9. Which command is used to shut down the Linux?

a)      Shutdown – h now

b)     Shutdown –h +10

c)      Both of the above

d)     None of the above

Answer c

Explanation: both the Shutdown – h now and Shutdown –h +10 is used to shut down the Linux. Just difference is that Shutdown – h now is used to shut the Linux instantly and Shutdown –h +10 shut the Linux after 10 mins. Hence, the correct answer is c.

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10. Is Linux operating system free from viruses?

A. Yes

B. No

C. Partly true partly false

D. None of the above

Answer- OPTION B

Explanation- Linux operating system has few numbers of viruses that are generated automatically.

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11. Which command is used for creating a file in Linux?

A. Touch

B. Cat

C. Echo

D. All of the above

E. None of the above

Answer- OPTION D

Explanation- Linux has various commands to create the file and it is possible for Linux to create a file using all the tree commands mentioned above in the option i.e., Touch, Cat, and Echo.

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12. Chown command in Linux is used for the following.

A. Creating a child process

B. Creating a thread

C. To change the title of each given file.

D. For changing the way of operation in kernel mode

E. None of the above

F. All of the above

Answer- OPTION C

Explanation- for changing the owner of the file, the directory in Linux Chown command is used which is the shortcut key for change "OWNER".

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13. What is the code of the Linux operating system?

A. Shell

B. Terminal

C. Command

D. Kernel

Answer- OPTION D

Explanation- kernel in the Linux operating system plays a very important role as it manages the main devices of the system i.e., the CPU, Memory of the system and the Peripheral Devices of the system. However, the kernel is considered at the lowest level in the operating system but it is the code of Linux.

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14. For context switching in Linux, the following process is followed.

A. By processing the switches from user mode to kernel mode.

B. By processing the switches from kernel mode to user mode

C. Kernel directly switches from executing from one process to another

D. User mode switches from executing from one process to another

E. None of the above.

Answer- OPTION A

Explanation- in Linux the meaning of context switch means the storing the life cycle of thread with various stages that cover in the life cycle of thread such as restore execution, etc.

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15. Who provides an environment for command interpreter?

A. CPU (Central Processing Unit)

B. Shell

C. Hardware

D. Kernel

Answer- OPTION C

Explanation- in Linux there is a method called overloading in which multiple methods with a different number of argument or with different data type is returned in the same class with the same name. There is also a method called constructor overloading which is also similar to method overloading for this case. However, in Java programming constructor of a class is not written in other class. For that method overwriting is used by using it in inheritance.

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16. What is the process that ends before the parent process exist?

A. Child

B. Orphan

C. Zombie

D. None of the above

E. All of the above

Answer- OPTION C

Explanation- zombie process means the process in which the parent process is already exited. On the other hand, in the orphan process parent process is running within itself while it is finished or ends for a computer process within the orphan process.

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17. For changing the directory ..... The command is used?

A. Cd

B. mv

C. man

D. mkdir

E. None of the above

Answer- OPTION A

Explanation- mv command is generally used to mobile a file from one directory to another. On the other hand, man command is generally used to show the manual for the command that is unknown to us. Whereas mkdir command is used for building a new directory. Hence, the correct command for change in the directory is cd.

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18. Which command is used to least the content inside the directory?

A. Mkdir

B. ls

C. rdir

D. rm

E. None of the above

Answer- OPTION B.

Explanation- mkdir command for making a new directory. There is no command for rdir. the rm command is used for removing the file in the directory. Hence, the correct answer is La that is used for listing the content inside the directory.

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19. What is the command used in Linux of the following?

A. A

B. W

C. T

D. X.

E. All of the above

F. None of the above

Answer- OPTION B

Explanation- There is no command called A; T and X. W command is used for the instant summary of the user using the computer.

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20. What is the use of is the command?

A. To print the content of the file in the screen.

B. To print the location of the directory in which you are working currently

C. To print the content of the directory

D. None of the above.

Answer- OPTION C

Explanation- for printing the content of the file in the screen cat command is used. For printing, the location of the directory in which you are working pwd command is used. Hence, the correct answer is Is command, which prints the content of the directory. Generally when we use the Is command by default least of the content of the directory in which we are working is printed. By changing the option, we can least the content of another directory also.

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21. Locate command is only used for finding the file in Linux. Mention true or false.

A. True

B. False

C. Partly true partly false.

D. None of the above

Answer- OPTION C

Explanation- locate command is not only used for finding the file in Linux but also for the directory in Linux. Locate command is considered as the database has driven command.

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22. What is the use of free command?

A. To display the amount of free ram in the system

B. To display the amount of used ram in the system

C. To print the swap space stats

D. All of the above

E. None of the above

Answer- OPTION D

Explanation- there is various uses of free command it helps us to display the used ram in the system and the free amount in the system. Not only this but also it is used for printing the swap space stats. Hence the correct option is all of the above i.e., Option D

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23. What is the use of history command?

A. For printing, the list of the command used previously

B. For finding the command that is unknown to us

C. For finding the information about the hostname, kernel version, Operating system name, operating system architecture, etc

D. None of the above

E. All of the above

Answer- OPTION A

Explanation- for finding the command that is unknown to us for this man command is used. For finding the information about the hostname, kernel version, Operating system name, Operating system architecture, etc for this man command is used. Hence, the right answer is OPTION A. History command, which is used for printing the list of previously used command. The shortcut key for quickly knowing the previously used command is control+r.

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24. What is the maximum number of process that takes place in Linux?

A. 1024

B. 2048

C. 32768

D. 16385

E. None of the above

Answer- OPTION C

Explanation- it is defined in many of the Linux operating systems that the maximum number of process that takes place in Linux is 32768

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25. Following things are supported by the Linux operating system.

a)      Multitasking

b)     Multi-user

c)      Multi-process

d)     All of the above.

Answer- OPTION d

Explanation- in Linux operating system many users can work together at a time. Hence, this process is multi-user. As well as there is a various process which can operate at a time in one Linux system? Hence, Linux support multi-process system. Similarly, in the form of thread, there are various tasks, which perform simultaneously supporting multitasking characteristics. Hence, the Linux operating system support multitasking, multi-user and multi-process too.

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26. How many characters can be there in the file name of Linux in bytes (mention maximum)?

A. 64

B.32

C. 255

D. 128

Answer-OPTION C

Explanation- for almost all the file system Linux has the maximum of 255 characters for its file name. As well as the maximum path is of 4096 characters.

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27. What is the use of clear command in Linux?

A. It clears a file in the directory

B. It clears the directory itself

C. It takes you to start position no matter what were you doing or which was the directory you were operating.

D. All of the above

Answer- OPTION C

Explanation- the clear command works by clearing all the process you have done whether correct or wrong at taking you back to the start position. The clear command cleans your screen and provides you the screen for fresh working. It is very easy to perform this command just it needs the simple word "CLEAR".

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28. What is the use of In command?

A. This command is used for inputting the files in the directory.

B. This command is used for creating a connection between files and directory

C. All of the above

D. None of the above

Answer- OPTION B

Explanation- in command is used for creating a link between files and directory you must be very careful while performing this command, as you have to mention the proper path and linking and unlinking slashes.

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29. Is Sudo command is a dangerous command?

A. True

B. False

C. None of the above.

D. Partly true and partly false

Answer- OPTION A

Explanation- Sudo command is considered as a dangerous command because it performs the higher action like taking permission authenticating the file denying the permission. Whenever such type of an event occurs we use Sudo command.

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30. Are tail command and head command same thing?

A. True

B. False

C. Partly true and partly false

D. None of the above

Answer- OPTION B

Explanation- head command and tail command similar things but has an opposite function of your target is to print starting lines of a file then you use head command and vice versa. When you want to print the last lines of the file then you use tail command. The similar thing between both the command is both prints the line and by default, the number of lines they print is same i.e. 10.

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31. As you know in Chmod command there is permission taking an operation for changing the file and directory. So there are three types of permission i.e., read, write and execute. Each permission is denoted by a number which of the following is true?

A. 2 for reading permission, 4 for write permission, 1 for execute permission

B. 4 for reading permission, 2 for write permission, 1 for execute permission

C. 1 for reading permission, 2 for write permission, and 4 for execute permission.

D. 4 for reading permission, 1 for write permission, 2 for execute permission

Answer- OPTION B

Explanation- as there is a general declaration in Chmod command for all the three permission i.e. our correct option is 4 for reading permission, 2 for write permission and 1 for execute permission.