This book covers Wireless communications, MANETs, Applications, and challenges of MANETs. Also Security related issues in MANETs like Passive Attacks, Active Attacks like Blackhole attacks, Wormhole attacks. This book introduces the design of experiments to investigate the significant factor affecting the AODV protocol performance under black-hole attacks in MANETs. This book also presents "Design and implementation of FBMMAODV to minimize the effect of Blackhole Attack on the functioning of AODV Protocol in MANETs. Finally, this book presents "Design and implementation of ANFISMMAODV to further minimize the impact of Blackhole attack.