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Introduction A palindromic sequence is a sequence of characters that remains the same when read forwards and backwards. In other words, a palindromic sequence reads the same way in both directions. Palindromes are fascinating from a linguistic perspective and are used in various applications, including genetics, linguistics, and cryptography. This article represents the following topic like definition, examples, and importance of palindromic sequences. Definition A palindrome is a word, phrase, or sequence of characters that is read the same way in both directions. A palindromic sequence, therefore, is a sequence of characters that has this property. Palindromic sequences ... Read More
OpenVPN is a popular and widely used open-source VPN solution that allows secure remote access to your network resources. Zentyal 3.4 is a Linux distribution that provides a complete server platform for small and medium-sized businesses. In this article, we will discuss how to install and configure the OpenVPN server on a Zentyal 3.4 PDC. Step 1: Install OpenVPN The first step is to install OpenVPN on your Zentyal server. Open the terminal and type the following command − sudo apt-get update sudo apt-get install openvpn Step 2: Generate Certificates and Keys OpenVPN uses certificates and keys to authenticate ... Read More
OpenVPN is a popular open-source VPN protocol that allows secure and private communication over internet. With OpenVPN, you can create a virtual private network that can be accessed from anywhere, providing a secure and encrypted connection for remote users. In this article, we will discuss how to install and configure OpenVPN on CentOS 8/7, which is a popular Linux distribution. Prerequisites Before we proceed with installation, we need to ensure that we have following prerequisites − A CentOS 8/7 server with root access. A static public IP address. An SSH client installed on your local machine. Step 1: ... Read More
Virtual Private Network (VPN) technology is essential for secure remote access to networks and resources. OpenVPN Access Server is a popular VPN solution that provides a scalable and robust VPN infrastructure for enterprises and organizations of all sizes. In this article, we will discuss how to install and configure OpenVPN Access Server on Ubuntu 20.04. Prerequisites Before we start, we need to ensure that we have following prerequisites − A VPS or dedicated server with Ubuntu 20.04 installed Root access to server A domain name pointing to server IP address A static IP address for server Basic knowledge of ... Read More
OpenSSH is an open-source tool that is used to provide secure encrypted communication between different machines on a network. It is widely used in Linux-based systems as a way to securely access and manage remote servers. In this article, we will discuss how to install and configure OpenSSH server in Linux. Step 1: Checking if OpenSSH is Installed The first step in installation process is to check whether OpenSSH is already installed on your Linux machine or not. To do this, open your terminal and type following command − ssh -V If OpenSSH is already installed, command will display ... Read More
The Network Time Protocol (NTP) is a protocol used to synchronize time on computers within a network. Accurate timekeeping is important for many systems, including databases, email servers, and financial applications. In this article, we'll show you how to install and configure an NTP server and client on Debian. Before we begin, you should have root access to your Debian server and be familiar with command line interface. Step 1: Install NTP on Debian The first step is to install NTP on your Debian server. Open terminal and enter following command − sudo apt-get install ntp This command will ... Read More
Nginx is a popular open-source web server software that can be used as a reverse proxy, load balancer, HTTP cache, and more. It’s known for its speed and scalability, and is widely used to serve web content for high-traffic websites. If you’re running an Ubuntu 20.04 server and want to use Nginx as your web server, this guide will walk you through installation and basic configuration process. Step 1: Update system Before we begin, it’s a good idea to update system to ensure that all packages are up to date. You can do this by running following command − sudo ... Read More
Nginx is a popular web server that is known for its performance, reliability, and ease of use. It is widely used for hosting websites, serving as a reverse proxy, load balancer, and caching server. In this article, we will discuss how to install and configure Nginx on CentOS 8. Before we begin, make sure that you have root access to your CentOS 8 server. Additionally, you should have a basic understanding of Linux command line and be comfortable working with terminal-based applications. Step 1: Update System The first step is to ensure that your CentOS 8 system is up-to-date. You ... Read More
Nginx is a popular web server that is known for its high performance, scalability, and low resource usage. It is commonly used as a reverse proxy, load balancer, and HTTP cache. In this article, we will discuss how to install and configure Nginx on CentOS 7. Step 1: Update System Before we start installing any packages, it's essential to update system to latest version. To do this, run following command − sudo yum update Step 2: Install Nginx Once system is updated, we can proceed with installation of Nginx. We can install Nginx using following command − sudo yum ... Read More
In organic chemistry, isomers are compounds that have the same molecular formula but different structures. There are two main types of isomers: constitutional isomers and stereoisomers. In this essay, we will explore the differences between constitutional isomers and stereoisomers. What are Constitutional Isomers? Constitutional (structural) isomers are compounds with the same molecular formula but with a different structure. Constitutional isomers are of three types. Skeletal (chain) Isomers Skeletal isomers have a uniform quantitative, qualitative, and functional composition, but a structurally different chain of molecules. The chains may be straight or differently branched. Typically, skeletal isomers have different physical properties. Positional ... Read More