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Currently, because almost all interactions occur online, internet security is a critical concern. Penetration testing evaluates network and system security while also revealing security weaknesses. Piercing testing is carry out to ensure that there are no security flaws in the system or network that would permit unauthorised access. Penetration testing, often known as Pen Testing, is a collection of processes designed to track down vulnerabilities in a network or system, or online application that an attacker may exploit. It assists to confirm the effectiveness and efficiency of the different security measures put in place. This document concisely describes the foundations of penetration testing as well as illustrates how and where to deploy and utilise several tools and methodologies for penetration testing using Kali Linux for detecting system vulnerabilities: and provide a review of firewalls, networking protocols, as well as …