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RHCSA Exam (Red Hat Certified System Administrator) – Questions & Answers
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RHCSA Exam (Red Hat Certified System Administrator) – Questions & Answers
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RHCSA Exam (Red Hat Certified System Administrator)– Questions & Answers
In which language is Linux written? What does the language have to do with
the success of Linux? Right Ans - More than 95 percent of the Linux
operating system is written in the C programming language, and C is portable
because it is written in a higher-level, machine-independent language. (The C
compiler is written in C.)Because Linux is portable, it can be adapted (ported)
to different machines and can meet special requirements.
What is a shell? How does it work with the kernel? With the user? Right
Ans - In a textual environment, the shell—the command interpreter—acts as
an interface between you and the operating system. When you enter a
command on the screen, the shell interprets the command and calls the
program you want.
Where on the disk should you put your /boot partition or the root (/)
partition if you do not use a /boot partition? Right Ans - Put /boot at the
beginning of the drive (partition 1) so that there is no issue
of Linux having to boot from a partition too far into the drive.
When might you specify an ext2 filesystem instead of ext4? Right Ans - Use
ext2 for partitions whose data does not change often, such as /boot. The
added overhead of the ext3 journal offers no benefit on these filesystems.
Why would you place /var at the beginning of the disk? Right Ans - The
/var filesystem contains files that are modified frequently. The beginning of
the disk is near the outer edge and data can usually be accessed faster from
this location.
How can you keep other users from using write to communicate with you?
Why would you want to? Right Ans - Give the command mesg n to keep
ordinary users from writing to your termi- nal. You can take this action when
you do not want to be disturbed or when you are viewing something on your
screen that you do not want overwritten.
What happens when you use diff to compare two binary files that are not
identical? (You can use gzip to create the binary files.) Explain why the diff
, output for binary files is different from the diff output for ASCII files. Right
Ans - Give the command mesg n to keep ordinary users from writing to your
terminal. You can take this action when you do not want to be disturbed or
when you are viewing something on your screen that you do not want
overwritten.
What is an inode? What happens to the inode when you move a file within a
filesystem? Right Ans - An inode is the control structure for a file. If the two
filenames have the same inode number, they share the same control structure
and are links to the same file.
Assume permissions on a file allow you to write to the file but not to delete it.
a. Give a command to empty the file without invoking an editor.
b. Explain how you might have permission to modify a file that you cannot
delete. Right Ans - Although it protects you from overwriting a file using
redirection, noclobber does not stop you from overwriting a file using cp or
mv. These utilities include the -i (interactive) option that helps protect you
from this type of mistake by verifying your intentions when you try to
overwrite a file.
Why does the noclobber variable not protect you from overwriting an existing
file with cp or mv? Right Ans - The noclobber variable keeps the shell from
overwriting a file and does not work on utilities. Thus it keeps a redirect
symbol (>) from allowing the shell to overwrite a file (the shell redirects
output) but has no effect when you ask cp or mv to overwrite a file.
Discuss the client/server environment set up by the X Window System. How
does the X server work? List three X clients. Where is the client and where is
the server when you log in on a local system? What is an advantage of this
setup? Right Ans - When you start an X Window System session, you set up
a client/server environ- ment. One process, called the X server, displays a
desktop and windows under X. Each application program and utility that
makes a request of the X server is a client of that server. Examples of X clients
include xterm, Compiz, gnome-calculator, and such general applications as
word processing and spreadsheet programs. A typical request from a client is
to display an image or open a window.Separating the physical control of the
display (the server) from the processes needing access to the display (the
client) makes it possible to run the server on one computer and the client on
another computer.
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