Linux MCQ Questions & Answers | Computer Science

The wc command is used to count the total number of lines, words, and characters contained in a file.
Using this command, you can quickly get statistics about a file's content, which is useful for various purposes, such as analyzing text files or checking the size of files.
It stands for "word count," but it can also count lines and characters depending on the options provided.
So, in summary, to count lines, words, and characters in a file, you'd use the wc command in Linux.

The rm command is used to remove files in Linux.
It stands for "remove".
When you want to delete a file from your system, you use the rm command followed by the filename.
It's a powerful command and should be used with caution as it permanently deletes files without moving them to a trash or recycle bin.
So, in summary, to remove files in Linux, you'd use the rm command.

The rmdir command is used to remove directories in Linux.
When you want to delete an empty directory from your system, you use the rmdir command followed by the directory name.
It stands for "remove directory".
It's important to note that this command only works for empty directories. If the directory contains any files or other directories, you need to use the rm command with appropriate options to remove them.
So, in summary, to remove directories in Linux, you'd use the rmdir command.

In the vi editor, the x command is used to delete a single character.
When you are in command mode in the vi editor, pressing x will delete the character under the cursor.
This command is useful for making small edits or corrections within a file.
So, in summary, to delete a single character in vi editor, you'd use the x command.

Red Hat does not support the Alpha hardware architecture.
While Red Hat supports various hardware architectures like SPARC, IBM-compatible (x86 and x86_64), and some Macintosh systems, it does not provide support for the Alpha architecture.
It's important to verify hardware compatibility when choosing an operating system, as not all architectures may be supported.
So, in summary, among the options provided, the architecture not supported by Red Hat is Alpha.

The physical layer of a network is responsible for defining the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between communicating network systems.
It deals with the transmission and reception of unstructured raw data over a physical medium.
This layer defines details such as voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, and other similar attributes that are required to transfer the raw bit stream over a physical medium between devices.
In summary, the physical layer primarily focuses on the physical aspects of transmitting data, such as electrical signals and mechanical connections.

TELNET is the TCP/IP protocol used for remote terminal connection service.
It allows users to log in remotely to another computer over a network and access its resources as if they were directly connected to that computer.
TELNET operates on the application layer of the TCP/IP model and provides a virtual terminal connection, enabling users to execute commands on a remote system.
It's important to note that TELNET transmits data, including passwords, in plain text, which makes it less secure compared to other remote access protocols like SSH (Secure Shell).
So, in summary, for remote terminal connection service, the TCP/IP protocol used is TELNET.

In Class B networks, the IP address space is divided into a large number of smaller networks, each with a moderate number of hosts.
A Class B network uses a 16-bit network prefix, allowing for 65,534 possible host addresses per network.
The total number of possible Class B networks is calculated as 214214, which equals 16,384 networks.
So, in summary, for a Class B network, there are 16,384 networks and 65,534 nodes per network.

DNS stands for Domain Name System, and it is the service used to translate domain names to IP addresses.
DNS acts as a distributed database that maps human-readable domain names (like example.com) to IP addresses (like 192.0.2.1) that computers use to communicate with each other over a network.
When you type a domain name into your web browser, your computer queries DNS servers to obtain the corresponding IP address, allowing it to connect to the appropriate web server.
So, in summary, to translate domain names to IP addresses, you'd use the DNS service.

To create a Linux installation boot floppy, you would typically use the dd command on Unix-like systems or rawrite command on Windows systems.
The dd command is a versatile utility used for copying and converting files. In this case, it can be used to copy the installation image to the floppy disk.
On Windows systems, rawrite is a command-line tool used to write raw disk images to removable media such as floppy disks.
So, in summary, to create a Linux installation boot floppy, you would use dd on Unix-like systems and rawrite on Windows systems.