Red Hat RH033 Online Practice Questions and Exam Preparation

Red Hat RH033 Online Questions & Answers

• Question 131:

  Fill in the blank with the command to complete the statement below. Do not enter the full path of the command. The ________ command is used to compare the contents of two files for differences in the Red Hat operating system.

  diff

  Explanation/Reference:

  To compare the contents of two files the diff command is used in the Red Hat operating system.

• Question 132:

  You are a newly appointed Technician for company.com Inc. You are working on the Red Hat operating system. As you are about to leave for some important work, you want to shut down your system immediately. Which of the following commands can you use to accomplish this?

  Each correct answer represents a complete solution. Choose all that apply.

  A. halt -h
  B. /sbin/stop
  C. shutdown -h now
  D. poweroff -h
  A. halt -h
  C. shutdown -h now
  D. poweroff -h

  ---

  Explanation/Reference:

  The shutdown -h now, halt -h, and poweroff -h commands can be used to shut down the Red Hat operating system immediately. Answer option B is incorrect. This is an invalid answer and hence cannot be used to shut down the system.

• Question 133:

  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. |

  ---

  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 134:

  Which of the following commands will you use to list all local and remote printers attached to your computer?

  A. lpq
  B. lpstat -d
  C. lpstat -t
  D. lpr
  A. lpq
  B. lpstat -d
  C. lpstat -t
  D. lpr

• Question 135:

  Which of the following commands can you use to see only the last ten lines of a file?

  Each correct answer represents a complete solution. Choose all that apply.

  A. head
  B. tail -10
  C. head -10
  D. tail
  B. tail -10
  D. tail

  ---

  Explanation/Reference:

  The tail or tail -10 command can be used to see only the last ten lines of a file. The tail -n command is used to see the last n lines of a file. By default, the tail command shows the last 10 lines of a file.

  Answer options A and C are incorrect. The head or head -10 command can be used to see only the first ten lines of a file. The head -n command is used to see the first n lines of a file. By default, the head command shows the first 10 lines of

  a file.

• Question 136:

  Which shell script is the first startup script run when a login shell is started in Linux?

  A. ~/.bashrc
  B. /etc/profile.d
  C. /etc/profile
  D. /etc/bashrc
  C. /etc/profile

  ---

  Explanation/Reference:

  The /etc/profile shell script is the first startup script run when a login shell is started. It runs only for the login shell.

  What is a Login shell?

  A login shell is a shell that is started by login into the system. The login shells' responsibility is to start the non-login shell

  and to make sure that environment variables are set so as to ensure that a user can get all the default parameters needed at start-up.

  Login shell will set the PATH environment variable, TERM, the UID and GID of the terminal amongst other things. These are the requirements in order to work proficiently. Additionally, the login-shell will set default variable such as

  USERNAME, HISTSIZE, HOSTNAME, HOME, etc.

  Answer option A is incorrect. The ~/.bashrc shell script is the first startup script run when a non-login shell is started.

  A non-login shell is a shell started by a user or a program issuing the bash command.

  Some non-login shells are as follows:

  su

  graphical terminals

  executed scripts

  any other bash instances

  Answer options D and B are incorrect. The non-login shells first call ~/.bashrc. The ~/.bashrc calls

  /etc/bashrc, and then /etc/bashrc

  calls /etc/profile.d.

• Question 137:

  Which of the following is NOT true about the inode table in the Linux operating system?

  A. It contains the location information where data is stored in the hard disk.
  B. It contains information about what type of access permission of the file is available to whom.
  C. It contains the last access time, last modification time, however it does not store the last inode change time.
  D. It contains the file type of the specified file.
  C. It contains the last access time, last modification time, however it does not store the last inode change time.

  ---

  Explanation/Reference:

  The inode table contains the last access time, last modification time as well as the last inode change time of a file.

  What type of data is stored in an inode table?

  An inode table contains a list of all files in an ext2 and ext3 filesystem. An inode ( index node) is an entry in the table, containing information about a file (the metadata). Some important data stored in the inode table are as follows:

  The file type (regular file, directory, etc.)

  File permissions

  Link count: The number of file names associated with the inode number. The user ID number of file owner and the group ID number of the associated group. Timestamps, including last access time, last modification time, and last inode

  change time.

  Location of the data on the hard disk.

  Answer options D, B, and A are incorrect. The inode table contains all these information, the file type, file permissions on the specified file, location of data on the hard disk.

• Question 138:

  Which of the following protocols are used for mail delivery?

  Each correct answer represents a complete solution. Choose two.

  A. IMAPS
  B. SMTP
  C. ESMTP
  D. POP3S
  B. SMTP
  C. ESMTP

  ---

  Explanation/Reference:

  Mail delivery is most typically done through one of the SMTP family of protocols, either SMTP or

  ESMTP.

  What is the ESMTP protocol?

  ESMTP (Extended Simple Mail Transfer Protocol) specifies extensions to the original protocol for sending e-mail that supports graphics, audio and video files, and text in different national languages. The original

  Internet protocols for sending e-mail are described in Request for Comments (RFC) 822, Standard for the Format of ARPA

  Internet Text Messages, and in RFC 821, Simple Mail Transfer Protocol (SMTP). As users demanded to attach various kinds of files to email, the need for additional facilities arose and resulted in RFC 1869, Extended Simple Mail Transfer

  Protocol. ESMTP provides the facility for a client e-mail program to ask a server e-mail program which facilities it supports and then communicate accordingly.

  Answer options A and D are incorrect. IMAPS and POP3S are used for mail pickup.

  What is the POP3S protocol?

  Post Office Protocol version 3 (POP3) is the protocol that clients use to pick up mail from servers.

  Users of POP3 generally store their mail locally on their system and configure their mail client to pick up new mail periodically.

  POP3 servers need clients to authenticate with a username and password. This ensures that only authenticated clients can pick up the user's email. Unfortunately, POP3 is an unencrypted protocol, so the username and password travel in

  cleartext. POP3S, on the other hand, is POP3 over Secure Sockets Layer. It provides an encrypted connection for the Post Office Protocol. More significantly, it provides an encrypted connection over which the username and password may

  be transmitted for authentication purposes.

  The departmental mail server provides POP3 (internally) and POP3S (internally and externally).

  Ultimately, POP3 support will be turned off in favor of IMAPS, which is a more modern protocol that can do everything POP3 can.

• Question 139:

  You work as a Network Administrator for McNeil Inc. The company has a Linux-based network.

  David, a Sales Manager, wants to know the name of the shell that he is currently using. Which of the following commands will he use to accomplish the task?

  A. ECHO $shell
  B. RM $shell
  C. MV $shell
  D. LS $shell
  A. ECHO $shell

  ---

  Explanation/Reference:

  In order to know the name of the current shell, he will run the following command:

  ECHO $shell

  The command line interpreter in Linux is known as the shell. When a user runs a command, the shell interprets, processes, and executes the command and provides an output to the user. Linux comes with quite a few shells such as Bourne

  Shell, Bourne Again Shell (BASH), C Shell, Korn Shell, etc. Bash is the most popular shell used by Linux users.

  What is BASH?

  The Bourne Again Shell (BASH) is a command language interpreter for the GNU's Not Unix (GNU) operating system. The following files are used to configure BASH:

  

• Question 140:

  You are working with the vi editor and writing a textfile. Which of the following commands will you use if you want to move the cursor 3 characters to the right?

  A. 3b
  B. 3w
  C. 3l
  D. 3h
  C. 3l

  ---

  Explanation/Reference:

  The 3l command in vi will move the cursor 3 characters to the right when you are in command mode of vi editor. You can go into command mode by pressing the key. What is the vi editor? The vi editor is an interactive, cryptic, and screen-based text editor used to create and edit a file. It operates in either Input mode or Command mode. In Input mode, the vi editor accepts a keystroke as text and displays it on the screen, whereas in Command mode, it interprets keystrokes as commands. As the vi editor is case sensitive, it interprets the same character or characters as different commands, depending upon whether the user enters a lowercase or uppercase character. When a user starts a new session with vi, he must put the editor in Input mode by pressing the "I" key. If he is not able to see the entered text on the vi editor's screen, it means that he has not put the editor in Insert mode. The user must change the editor to Input mode before entering any text so that he can see the text he has entered. Answer option D is incorrect. The 3h command will move the cursor 3 characters to the left. Answer option B is incorrect. The 3w command will move the cursor forward by 3 words. Answer option A is incorrect. The 3b command will move the cursor backward by 3 words.