The self-configuring ability of nodes in MANET absolutes it admired among essential mission applications like military use or emergency recovery. The mobility and scalability carried by wireless network ended it possible in many applications. Surrounded by all the contemporary wireless networks Mobile Ad-hoc NETwork (MANET) is one of the most significant and exclusive applications. In this paper, a qualified learns of secure Intrusion-Detection Systems (IDS) for determining malicious nodes and attacks on MANETs are presented. Due to some special characteristics of MANETs prevention mechanisms alone are not sufficient to handle the secure networks.