The RHCSA certification is for those experienced RedHat Linux system administrators who want to validate their skills, or for someone whose employing organization has required him/her to possess the certification.Those who want to recertify their skills and the students of Red Hat System Administration 1 and 2 can pursue this certification as well.
The RHCSA or Red Hat Linux certification holders and experts can perform tasks including the deployment, configuration, management, and maintenance of the Linux enterprise system. They are also able to update the system, install the required software, and are expert in other core and extended services as well. The RHCSA certification makes you eligible for the job roles including Linux System Engineer, Senior Systems Administrator, Information System Engineer and others The RHCSA and Linux Administration certification holders get a salary of more than US dollar 107,000 in the United States and in between rupees 3 to 6 lacs in India. Here are some questions (along with their answers) that can be asked in an RHCSA interview when you appear for a job interview after getting your Linux administrator certification.
1. Name the first process of Linux.
The first process of Linux is called “init”. A kernel starts this process and the PID of it is 1.
2. What is the difference between U limit and U Mask?
Umask is also called as the “User File Creation Mask”. It relates to a mask set, which can control the file permissions. U limit. on the other hand, is a built-in command in Linux that helps the user control the different resources that are available within a shell. It can also control certain processes.
3. What is Puppet?
Puppet is an Enterprise level and open source application that can be used for Configuration Management in UNIX and other similar operating systems. The IT automation tool and software can push the configurations to the clients through a code. The Puppet code can check the different file permissions, install the new software and can also update the user accounts. There are also many other tasks that Puppet can accomplish.
4. What is the use of LVM?
LVM or Logical Volume Manager can be used to resize the size of the file system. The commands LVextend and LVreduce are used for the purpose.
5. How can we check the CPU and memory Stats?
CPU stats related to utilization and other aspects can be viewed and checked through the ”sar” command. The “VMstat” and “free” commands can be used to check both physical as well as virtual memory related statistics.
6. What does the term Network Bonding Mean?
The aggregation and combination of a number of LAN cards within a single and bonded interface are termed as Network Bonding. Network bonding provides for better performance and increased tolerance towards fault. It is also known by the name NIC Teaming.
7. Define the term Load Average?
The number of commands and processes that are waiting and make a part of the run queue, and the processes that are being currently executed, are collectively termed as load average. We can find the load average of any given Linux server by using the “uptime” and “top” commands.
8. What are the different core components of Linux?
The core components of the Linux operating systems are formed by the shell, kernel, command script, and terminal.
9. Define Selinux?
SELinux is an abbreviation that stands for security-enhanced Linux. The Linux Kernel has this security feature that also provides for access control. It protects the server from the Daemons and miss-configurations, by limiting them and by having a well-defined security policy.
10. What is an Inode?
An inode can be found in Linux, UNIX, and all other similar operating systems. While it does not store the actual data and the name, it stores all other information about any given file. Whenever a new file is created, it is provided a specific Inode number along with the name. The Inode number is unique within a given file system and consists of integers. The files that are stored within a given directory control contain both the Inode number and the filename. Inode provides for recovery of data when a file system gets damaged.
11. Define the term Initrd.
Initrd is an abbreviation that stands for Initial Ram Disk. It contains the root file systems that are temporary in nature and also contains the necessary modules.
12. Define the term Bootloader.
The bootloader is responsible for booting the operating system, and also helps towards choosing the right kernel that will be used towards booting.
13. Define the term, Soft Link.
The method that is used for creating shortcuts in the Linux operating system is termed as Soft Link. It is just like the Windows shortcut feature.
In order to clear the Red Hat Certified System Administrator exam (or the RHCSA) exam, you need to get proper training and should study for it at a relevant IT education provider.The RHCSA exam is also known by the name Exam EX200.
During the training period, you will learn the fundamentals relevant to the certification including the shell commands, creation, and modification of users, change of password etc. The course also teaches the students ways to manage the files, locating the files, and using the stream editor. Apart from these areas, concepts like system management (including booting, rebooting etc), package installation, network services, security, virtual machines, server management and storage management are other topics covered by the course. The hands-on red hat training is provided by an expert instructor (both online and offline learning and training options are available) by the leading IT education service providers in India. You can learn from the comfort of your home itself and be a Red Hat Certified System Administrator. The RHCSA red hat certification cost is around INR 17,500.
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