From The Art of Network Penetration Testing by Royce Davis

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Penetration testing, also called pentesting, is about more than just getting through a perimeter firewall. The biggest security threats are inside the network, where attackers can rampage through sensitive data by exploiting weak access controls and poorly patched software. Designed for up-and-coming security professionals, The Art of Network Penetration Testing teaches you how to take over an enterprise network from the inside. It lays out every stage of an internal security assessment step-by-step, showing you how to identify weaknesses before a malicious invader can do real damage. Similarly, you may also be interested in reading an entry from this Cobalt blog about the different methods for testing application security. This way you can ensure you’re protected and prepared for any incoming attacks, whether you use this book as a guidance or any other sources available near you.