The interviews for developers often include questions on the basics of the Linux and other Unix based operating systems. Others who have interviewed for various posts usually document these questions. The answers might vary from person to person but the concept remains the same and this can only be understood when the person is clear on the basics of Linux.
Linux is quite different from Windows but it has a wide acceptance in some fields. Since it is open source software operating system, Linux is basically free and is used as a cross-platform operating system, which can easily be installed in PCs, laptops, video game consoles and more. This is what opens up many applications for Linux and thus a demand for talented and knowledgeable professionals who are aware of the field they are working in. You will know a lot of the answers to the given questions if you have worked with the OS for a long time.
These questions and answers on Linux OS are sure to help you out in the interview by helping you understand the pattern of the questionnaire and the types of questions asked. So, here are the questions and their answers.
Linux is free open source multi-user operating system that is built on Linux kernel. Linus Torvalds released the first version of Linux operating system on September 17, 1991.
Some Difference between Linux and Unix Operating System:
|Linux is open source anyone can use it free of cost.||UNIX is copyrighted only big companies like IBM AIX and Sun Solaris and HP-UX use it|
|Linux is just a kernel.||Unix is a complete operating system|
|By default, Linux supports and use ext3 or ext4 file systems||Unix comes with jfs, gpfs (AIX), jfs, gpfs (HP-UX), jfs, gpfs (Solaris) filesystems|
|Linux Redhat Enterprise, Fedora Linux, Debian Linux, Suse Enterprise Linux, Ubuntu Linux are some popular Linux OS.||HP-UX, IBM AIX, Sun Solaris, Mac OS X are some Unix based operating systems|
|Linux is considered as most user-friendly||Apple OS X is most popular UNIX operating system for desktop usage.|
The PTR record is basically used as a spam filter and is used to authenticate the incoming messages. An A record should always exist for the PTR records.
CNAME stands for Canonical Name, which is what this record provides to an alias name.
MX stands for Mail Exchanger and the MX record is a special type of resource record in the DNS (Domain Name System). It specifies a mail server, which is completely responsible for accepting the messages via email on behalf of the recipient’s domain. A preference value is used to prioritize the mail delivery in case of multiple servers.
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