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You work as an Administrator for McRoberts Inc. The company has a Linux-based network. You are logged in as a non-root user on your client
computer. You want to delete all files from the /garbage directory. You want that the command you will use should prompt for the root user
password. Which of the following commands will you use to accomplish the task?
See the explanation below.
In order to accomplish the task, you will have to use the su command. This command will switch the user. According to the question, the
command should prompt for the root user password. If you do not specify any user account with the su command, the command switches the
login for the root user and prompts for the root user password. The -c switch with the su command passes a single command to the shell. You
can use the rm command with the -c option to remove the required files. The -rf switch with the rm command does not confirm the user before
file deletion.
John works as a Network Administrator for Perfect Solutions Inc. The company has a Linux-based network. He is working as a root user on the Linux operating system. He wants to delete his private.txt file from his operating system. He knows that the deleted file can be recovered easily. Hence, he wants to delete the file securely. He wants to hide the shredding, and so he desires to add a final overwrite of the file private.txt with zero. Which of the following commands will John use to accomplish his task?
See the explanation below.
According to the scenario, John will use the shred -vfuz private.txt command. The shred command with the -z option adds a final overwrite
with zeros to hide shredding.
Answer option D is incorrect. This command removes the file forcibly, but it does not perform a secure deletion.
Answer option B is incorrect. This command overwrites the file forcibly with changing permissions to allow writing.
Answer option A is incorrect. The rmdir command is used to remove the directories but not the files. The rmdir command is used to remove a
directory in a Linux computer.
Syntax:
rmdir [options] <directory name>
Example:
The following command will remove a directory named xdir from the /home/user directory:
rmdir /home/user/xdir
You work as a Network Administrator for Secure World Inc. The company has a Linux-based network. You want to run a command with the changed root directory. Which of the following commands will you use?
See the explanation below.
In order to run a command with the changed root directory, you will have to execute the following command:
chroot <new root> <command>
chroot runs a command or an interactive shell with a special root directory. It runs the specified command with the root directory set to <new
root>.
Answer option A is incorrect. The ls command is used to list files and directories in a Linux computer.
Answer option D is incorrect. The chdir command changes the current directory to the path specified with the command.
Answer option C is incorrect. The route command manipulates the kernel's IP routing tables.
You work as a Network Administrator for Net World Inc. The company has a Linux-based network. You are optimizing performance and security on your Web server. You want to know the ports that are listening to FTP. Which of the following commands will you use?
See the explanation below.
In order to accomplish the task, you will have to use the following command:
netstat -a | grep FTP
The netstat command with the -a switch produces all connections and listening ports. The grep command will help search entries that contain
the FTP word.
Answer option D is incorrect. The netstat -r command is equivalent to the route command. It shows the route table of a computer.
Answer options C and B are incorrect. These syntaxes are not supported by the netstat command.
You work as a Network Administrator for McRobert Inc. You want to know the NetBIOS name of your computer. Which of the following commands will you use?
See the explanation below.
NBTSTAT -n displays the list of local NetBIOS names.
Answer options D and A are incorrect. The netstat command displays protocol-related statistics and the state of current TCP/IP connections. It
is used to get information about the open connections on a computer, incoming and outgoing data, as well as the ports of remote computers
to which the computer is connected. The netstat command gets all this networking information by reading the kernel routing tables in the
memory.
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