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Configuring CentOS Run Levels and Services Understanding CentOS Run Levels CentOS can be configured to boot into one of a number of different run levels. During the boot sequence, a process named init looks in the /etc/inittab file to find the default run level. Having identified the run level it proceeds to execute the corresponding startup scripts … Read more
Bootstrap icon bar with CSS Example: <!DOCTYPE html> <html> <meta name=”viewport” content=”width=device-width, initial-scale=1″> <link rel=”stylesheet” href=”https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css”> <style> body {margin:0} .icon-bar { width: 90px; background-color: #555; } .icon-bar a { display: block; text-align: center; padding: 16px; transition: all 0.3s ease; color: white; font-size: 36px; } .icon-bar a:hover { background-color: #000; } .active { … Read more
bootstrap : Responsive Navbar with Links of Same Width Example: Responsive Navbar with Links of Same Width Try to resize the browser window to see the responsive effect. Home Search Contact Login Here is the code <!DOCTYPE html> <html> <meta name=”viewport” content=”width=device-width, initial-scale=1″> <link rel=”stylesheet” href=”https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css”> <style> * {box-sizing: border-box} body {font-family: Arial, Helvetica, sans-serif;} … Read more
History of email and When the first email sent Electronic mail (email or e-mail) is a method of exchanging messages (“mail”) between people using electronic devices. Email entered limited use in the 1960s, but users could only send to users of the same computer, and some early email systems required the author and the recipient … Read more
Web security is also known as “Cybersecurity”. It basically means protecting a website or web application by detecting, preventing and responding to cyber threats. Websites and web applications are just as prone to security breaches as physical homes, stores, and government locations. An effective approach to web security threats must, by definition, be proactive and defensive. Difference between Authentication and Authorization When speaking … Read more
sendmail – installation and testing Sendmail is highly configurable, allowing control over almost every aspect of how email is handled, including the protocol used. Many system administrators elect to use Sendmail as their MTA due to its power and scalability. Installation of sendmail # yum install sendmail m4 telnet mailx sendmail-cf Loaded plugins: rhnplugin, security … Read more
Install Let’s Encrypt to Create SSL Certificates What is Let’s Encrypt Let’s Encrypt is an SSL certificate authority managed by the Internet Security Research Group (ISRG). It utilizes the Automated Certificate Management Environment (ACME) to automatically deploy free SSL certificates that are trusted by nearly all major browsers. Start Downloading and installing Let’s Encrypt Download and Install Let’s … Read more
IGNOU MCS-011 Problem Solving and Programming pdf Book Download Course Code Course Title Download MCS-011 Problem Solving and Programming Block-1 An Introduction to C Unit-1 Block-1 An Introduction to C Unit-2 Block-1 An Introduction to C Unit-3 Block-1 An Introduction to C Unit-4
Learning starts with failure; the first failure is the beginning of education. – John Hersey
SDP – Session Description Protocol What means SDP? Session Description Protocol, a communication protocol for describing multimedia sessions Single-dealer platform, software used in financial trading. Sockets Direct Protocol, a low-level remote-computing protocol. Software Defined Perimeter, also called “Black Cloud”, an approach to computer security. It is used to describe multimedia sessions in a format understood by … Read more