RHCSA Test Questions with Correct Answers
What is a boot loader? - Answer-A boot loader is a very small program that the bootstrap process uses as it brings a computer up from off or reset to a fully functional state. The boot loader frequently resides on the starting sectors of a hard disk called...
What is a boot loader? - Answer-A boot loader is a very small program that the
bootstrap process uses as it brings a computer up from off or reset to a fully functional
state. The boot loader frequently resides on the starting sectors of a hard disk called the
MBR (master boot record).
How would you obtain a list of all network-related kernel parameters? - Answer-The
sysctl utility displays and configures kernel parameters at runtime. Enter the following
command to display network-related kernel parameters:
$ /sbin/sysctl -a | grep net
If the system is less responsive than normal, what is a good first step in
figuring out where the problem is? - Answer-Run top to see if a process is using close to
100 percent of the CPU. If there is one, contact its owner or just kill the process. The
user can restart the process with nice if necessary.
Give two reasons why RAID cannot replace backups. - Answer-1) It is very possible that
both disks are damaged at the same moment, for example by fire, overvoltage from a
lightning strike etc.
2) RAID does not protect from user accidentally erasing information.
And there are plenty of other reasons:
3) Usually RAID arrays are assembled from identical disks from the same
manufacturing batch and they are burdened identically. This means that they are quite
likely to fail around the same time.
4) RAID array can be corrupted by a single bug or failure in the RAID controller.
What does the /etc/resolv.conf file do? What do the nameserver lines in this file do? -
Answer-The /etc/resolv.conf file is the resolver configuration file. It provides access to
DNS for Internet address resolution. The nameserver lines indicate which systems the
local system should query to resolve hostnames into IP addresses, and vice versa.
What is a device file? Where are device files located? - Answer-Device files allow user
programs to access hardware devices on the system through the kernel. They are not
"files" per se, but look like files from the program's point of view: you can read from
them, write to them, mmap() onto them, and so forth. When you access such a device
"file," the kernel recognizes the I/O request and passes it a device driver, which
, performs some operation, such as reading data from a serial port, or sending data to a
sound card.
Device files (although inappropriately named, we will continue to use this term) provide
a convenient way to access system resources without requiring the applications
programmer to know how the underlying device works. Under Linux, as with most Unix
systems, device drivers themselves are part of the kernel. In the section "Section 7.4.2,
"Building the Kernel"" in Chapter 7, "Upgrading Software and the Kernel", we show you
how to build your own kernel, including only those device drivers for the hardware on
your system.
Suggest two advantages that rpm files have over source distributions. - Answer-Some
advantages are automatic dependency resolution, fast installation, simple uninstall,
ability to query the package database, and easier deployment. Also, many software
packages with complicated configuration scripts examine the local system to determine
which options to compile with, so you may end up with different executables on different
systems. Using distribution binary packages keeps documentation consistent with
installed programs and makes it possible for developers to reproduce bugs more easily.
How would you display a list of all loaded modules in the current kernel? - Answer-
lsmod
What is the purpose of the kernel? - Answer-A kernel connects the application software
to the hardware of a computer. Applications -> Kernel -> (CPU, Memory, Devices)
How would you display information from the kernel about the hard disk on the first SATA
channel? - Answer-The dmesg utility displays the kernel-ring buffer, where the kernel
stores messages. The following command displays the lines from this buffer that contain
the string sda, which refers to the first SATA disk:
$ dmesg | grep sda
The acpi=off kernel argument prevents acpid from starting. How would you use this
argument? - Answer-his parameter is use- ful for systems that do not support ACPI or
that have problems with their ACPI implementation. The default is to enable ACPI.
Specifying acpi=off has the same effect.
How would you obtain a list of all network-related kernel parameters? - Answer-The
sysctl utility displays and configures kernel parameters at runtime. Enter the following
command to display network-related kernel parameters:
$ /sbin/sysctl -a | grep net
A process stores its PID number in a file named process.pid. Write a command line that
terminates this process. - Answer-Locate the PID of process.pid with pidof process.pid
Then, once you have the PID of it type, kill 1234 or kill -9 1234
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