Red Hat RH033 Online Practice Questions and Exam Preparation

Red Hat RH033 Online Questions & Answers

• Question 1:

  John works as the Network Technician for Tech Perfect Inc. The company has a Linux- based network.

  John is a root user on the Red Hat operating system. John has two files named foo.txt and student.txt, which are too long. John wants to view the output of both the files on one screen at a time. Which of the following commands should John use to accomplish this task?

  A. touch foo.txt student.txt
  B. cat foo.txt | student.txt
  C. cp foo.txt student.txt
  D. cat foo.txt student.txt | less
  D. cat foo.txt student.txt | less

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  explanation:

  Explanation/Reference:

  The cat command concatenates both files foo.txt and student.txt together and | (pipe) will send the standard output of the cat command to the standard input of the less command, and this will show the output of both files on one screen at a time.

• Question 2:

  You work as a Network Administrator for Perfect World Inc. The company has a Linux- based network. You have configured a Linux server to connect to the Internet. Before connecting it to the Internet, you want to check all the files on which SUID has been set. Which of the following commands will you choose to list all such programs?

  A. find /-perm -2000
  B. ls -l
  C. ls -suid
  D. find /-perm -4000
  D. find /-perm -4000

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  explanation:

  Explanation/Reference:

  In order to accomplish the task, you will have to execute the following command: find /- perm -4000

  This command will search the current directory and its sub-directories for all the files on which SUID has been set.

  Answer options C and B are incorrect. The ls command is used to list all files in the current directory and its subdirectory.

  Answer option A is incorrect. This will find all the files on which SGID is set.

• Question 3:

  Which of the following operators is used to connect the output of one command to the input of another command?

  A. >
  B. |
  C. 2>
  D. and>
  B. |

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  explanation:

  Explanation/Reference:

  A pipe is a way to connect the output of one command to the input of another command without any temporary file.

  What is a pipe?

  A pipe is a temporary storage place where the output of one command is stored and then passed as the input for another command. Pipes are used to run more than two commands from the same command line.

  Syntax:

  command1 | command2 | command3...........etc.

  Answer option A is incorrect. The operator > is used to redirect standard output (STDOUT) to a file.

  Answer option C is incorrect. The operator 2> is used to redirect standard error (STDERR) to a file.

  Answer option D is incorrect. The operator and> is used to redirect all output to a file.

• Question 4:

  Which of the following commands is used to securely copy files from one host to another over the network?

  A. ls
  B. cat
  C. mutt
  D. scp
  D. scp

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  explanation:

  Explanation/Reference:

  The scp command is used to copy files from one host to another over the network.

  What is the scp command?

  The scp command is used to copy files over ssh connections. This is pretty useful if a user wants to transport files between computers, for example, to backup a file. The scp command uses the ssh command to copy files over the network.

  Syntax:

  # scp [options] source destination

  Where, source refers to the file which a user wants to copy from his current computer/directory, and destination refers to the home directory of the remote system where a user wants to copy the file.

  Some important options used with the scp command are as follows:

  

  Answer option A is incorrect. The ls command in Linux lists information about files (the current directory by default).

  Answer option C is incorrect. The mutt command is used to manage email within a text only environment.

  Answer option B is incorrect. The cat command is used to join multiple files together and display the result on the screen.

• Question 5:

  Which of the following is NOT the feature of SELinux in the Red Hat enterprise Linux?

  A. SELinux applies to all users, including root.
  B. All process and files have a context.
  C. SELinux implements Mandatory Access Control (MAC) security in Red Hat Enterprise Linux.
  D. SELinux does not provide Kernel-level security.
  D. SELinux does not provide Kernel-level security.

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  explanation:

  Explanation/Reference:

  SELinux is an operating system based on Linux which includes Mandatory Access Control.

  The SELinux provides Kernel-level security for Red Hat Enterprise Linux. Answer options C, B, and A are incorrect. These are the features of SELinux.

  What are the features of SELinux?

  The features of SELinux are as follows:

  SELinux provides Kernal-level security.

  SELinux implements Mandatory access control (MAC) security in Red Hat Enterprise Linux.

  SELinux assigns every file and process on the system a context, identifying its type and purpose.

  SELinux enforces a policy that dictates which actions a given type of process may take on a given type of file

  SELinux applies to all users, including root.

• Question 6:

  Which of the following files is the default configuration file of XDM (X Window Display Manager)?

  A. /etc/X11/xdm/xdm-config
  B. $HOME/.Xauthority
  C. /usr/bin/xdm-config
  D. /usr/bin/xterm
  A. /etc/X11/xdm/xdm-config

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  explanation:

  Explanation/Reference:

  The /etc/X11/xdm/xdm-config file is the default configuration file of XDM. The X Window Display

  Manager (XDM) is the default display manager for the X Window System. XDM is distributed as part of XFree86 and is configured by a series of files located in /etc/X11/XDM. Some of the important files of XDM are given below in the list:

  Xaccess: It is used to control inbound requests from remote hosts. Xresources: This file holds configuration information for XDM resources and the graphical login screen. It can be edited to modify the appearance of the XDM login screen.

  Xservers:

  This file is used to associate the X display names with either the local X server software or a foreign display such as an X terminal.

  Xsession: This file contains the script XDM launches after a successful login. Xsetup_0: This file defines how XDM will open. It is a script started before the graphical login screen.

  It often includes commands to set colors, display graphics, or run other programs. This script is executed as root.

  XDM-config: This file is used to configure XDM configuration resources. Answer option B is incorrect. $HOME/.Xauthority is the user authorization file where XDM stores keys for clients to read.

  Answer option D is incorrect. The /usr/bin/xterm file is the default session program of XDM. Answer option C is incorrect. It is not a valid XDM configuration file.

• Question 7:

  You work as the Network Technician for Tech Perfect Inc. The company has a Linux-based network.

  You are working as a root user on the Linux operating system. You want to create an alias such that when you type c, the system should run the clear command to clear the screen. Which of the following tools should you use to accomplish the task?

  A. alias clear
  B. alias clear= c
  C. alias c
  D. alias c= 'clear'
  D. alias c= 'clear'

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  explanation:

  Explanation/Reference:

  When a user types alias c= 'clear' on the command prompt and presses Enter this will create an alias for the clear command. After creating the alias whenever a user wants to clear the screen, he just needs to type c and then press Enter.

  This action will clear the screen. This alias will be lost if a user logs out and logs in again.

  What is the alias command?

  The alias command is a shortcut name for longer commands. If a command is run often, but it takes a considerable amount of time in typing that command, the time can be reduced by using the alias command.

  For example: # alias list= 'ls-la'

  This will create an alias called list, which will use the ls command to print a long-style listing of all files in the current directory (the -l gives a long-style list, and the -a shows all files - including hidden files).

  Answer options B, C, and A are incorrect. These are incorrect commands and will show error messages on the command prompt.

• Question 8:

  You work as a Network Administrator for Perfect solutions Inc. The company has a Linux- based network. You are a root user on the Red Hat operating system. You want to see the file permissions on a file. Which of the following commands will you use to accomplish the task?

  A. cat
  B. ls -l
  C. ls
  D. ls -perm
  B. ls -l

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  explanation:

  Explanation/Reference:

  The ls -l command shows the permissions on a specified file. Answer option C is incorrect. The ls command without arguments lists the file and directory names in the current directory. Answer option D is incorrect. No such command exists in Linux. Answer option A is incorrect. The cat command shows the contents of a file.

• Question 9:

  Which of the following commands is used to mount file systems?

  A. detach
  B. attach
  C. mount
  D. umount
  C. mount

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  explanation:

  Explanation/Reference:

  In Linux, the mount command is used to mount and display disks, partitions, and file systems.

  Mounting refers to the process in which the operating system prepares the media to be read.

  Note: The swap file system cannot be mounted using the mount command. Answer option D is incorrect. In Linux, the UMOUNT command is used to unmount a file system from its mount point.

  Answer options A and B are incorrect. There are no such commands as attach and detach in Linux.

• Question 10:

  You want to terminate your X session. Which of the following key combinations will you use to accomplish this?

  A. Ctrl+Alt+F7
  B. Ctrl+Alt+Backspace
  C. Ctrl+Alt+Fn
  D. Ctrl+Alt+A
  B. Ctrl+Alt+Backspace

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  explanation:

  Explanation/Reference:

  The Ctrl+Alt+Backspace key combination is used to terminate the X session. Answer option A is incorrect. The Ctrl+Alt+F7 key combination is used to switch from a virtual console back to the X terminal.

  Answer option C is incorrect. The Ctrl+Alt+Fn key combination is used to switch from graphical mode to the nth (n varies from 1-6) virtual console running in text mode. Answer option D is incorrect. Ctrl+Alt+A is not a valid key combination to

  terminate the X session.