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 An intrusion detection system (IDS) An intrusion detection system (IDS) is a system that monitors network traffic for suspicious activity and alerts when such activity is discovered. While anomaly detection and reporting are the primary functions of an IDS, some intrusion detection systems are capable of taking action when malicious activity or anomalous traffic is detected, including blocking traffic sent from suspicious Internet Protocol (IP) addresses. An IDS can be contrasted with an intrusion prevention system (IPS), which monitors network packets for potentially damaging network traffic, like an IDS, but has the primary goal of  preventing  threats once detected, as opposed to primarily detecting and recording threats. How do intrusion detection systems work? Intrusion detection systems are used to detect anomalies with the aim of catching hackers before they do real damage to a network. IDSes can be either network- or host-based. A host-based i...

Kali Linux   is a security distribution of Linux derived from Debian and specifically designed for computer forensics and advanced penetration testing. It was developed through rewriting of BackTrack by Mati Aharoni and Devon Kearns of Offensive Security.   Kali Linux   contains several hundred tools that are well-designed towards various information security tasks, such as penetration testing, security research, computer forensics, and reverse engineering. BackTrack was their previous information security Operating System. The first iteration of Kali Linux was Kali 1.0.0 was introduced in March 2013. Offensive Security currently funds and supports Kalin Linux. you would see a large banner stating, “Our Most Advanced Penetration Testing Distribution, Ever.” A very bold statement that ironically has yet to be disproven. Kali Linux has over 600 preinstalled penetration-testing applications to discover. Each program with its unique flexibility and use case. Kali Linux does a...

  What is a Backlink? Backlinks are also known as inbound links. These are the links from one website to a page on another website. Website pages with a high number of backlinks are more likely to rank on the search engine rather than one which does not have. Why do You Need a Backlink? You would need a backlink for better results for your website over the internet. If you have a number of links on your site, the more weightage you will have on the search engine. Creating a large number of backlinks is why a blog or website ranks over google or other search engines. Types of Backlinks There are two types of backlinks. Do-Follow: A Dofollow link passes the authority of the original website to the desired site. These links allow other search engines and Google to point back to your website or blog. A Dofollow link helps your website rank in the top positions in the search engines. High-quality do-follow backlinks are the best way to generate increased traffic for your website. No-Fol...

What is Constant in PHP A constant is a name or an identifier for a fixed value. Constants are like variables, except that once they are defined, they cannot be undefined or changed. Constants are very useful for storing data that doesn't change while the script is running. Common examples of such data include configuration settings such as database username and password, website's base URL, company name, etc. Constants are defined using PHP's  define()  function, which accepts two arguments: the name of the constant, and its value. Once defined the constant value can be accessed at any time just by referring to its name.  <?php // Defining constant define ( "SITE_URL" , "https://www.tutorialrepublic.com/" ) ; // Using constant echo 'Thank you for visiting - ' . SITE_URL ; ?> Conventions for PHP Constants Name of constants must follow the same rules as variable names, which means a valid constant name must start with a letter or ...

  Variables are used to store data, like strings of text, numbers, etc. Variable values can change over the course of a script. Here're some important things to know about variables: 1) In PHP, a variable does not need to be declared before adding a value to it. PHP automatically converts the variable to the correct data type, depending on its value. 2) After declaring a variable it can be reused throughout the code. 3) The assignment operator ( = ) used to assign value to a variable. In PHP variable can be declared as:   $var_name = value; <?php // Declaring variables $txt = "Hello World!" ; $number = 10 ; // Displaying variables value echo $txt ; // Output: Hello World! echo $number ; // Output: 10 ?> In the example, we have created two variables where the first one has been assigned with a string value and the second has been assigned with a number. Later we displayed the values of the variables in the browser using the  echo  statement. T...

B asic PHP syntax, including case sensitivity, statements, and whitespaces. As a programming language, PHP has a set of rules that governs how you write programs. Start PHP  <?php Enclosing tag ?> Example <!DOCTYPE html > < html lang = "en" > < head > < meta charset = "UTF-8" > < title > PHP Syntax </ title > </ head > < body > < h1 > <?php echo 'PHP Syntax' ; ?> </ h1 > </ body > </ html >   PHP code, the enclosing tag is optional <?php echo 'PHP Syntax' ; PHP is partially case-sensitive. Knowing what is case sensitive and what is not is crucial to avoid syntax errors. If you have a function such as, you can use it as  COUNT . It would work properly. The following are case-insensitive in PHP: PHP constructs are if, if-else, if-else, switch, while, do-while, etc. Keywords such as  true  and  false . ...