This book is a guide on how to do network penetration testing. The first part of the book guides you on how to penetrate network routers and switches and look for the strength of various security measures implemented on them. You will learn how to test for the various security protocols which are implemented on routers and switches. The book then guides you on how to test the security of wireless networks. You will learn how to crack Wi-Fi passwords. A firewall is a good mechanism for ensuring network security. It filters the traffic getting into and leaving an organization. This book guides you on how to penetrate a network firewall and identify any holes. You will also learn how to close such holes for a secure network. Intrusion Detection Systems (IDSs) are good for ensuring that an organization's network is secure. This book teaches you how to test for the strength of the IDS mechanisms of your network. You are also shown how to ensure that such systems are secure.The following topics are discussed in this book:- Router and Switch Penetration Testing- Cracking a WPA Wi-Fi Password- Firewall Penetration Testing- IDS Penetration Testing