Abstract: MANET (Mobile Ad-hoc Network) which is well known as infrastructure less network finds its application in situations where setting up of network should be impromptu. But this advantageous aspect of MANET can be used as a weakness to intrude into the system. That’s why it becomes very important to tackle this scenario. In this paper two of the major attacks i.e. Black hole attack and Gray hole attack are discussed. First is active kind of attack in which malicious node participates actively whereas later one is passive attack, which is difficult to detect because malicious nodes do not drop the packets every time. So, it is quite evident that first one is eliminated and later one is prevented. This paper attempts to put forward all such aspects of MANET. 

Keywords: Black hole attack, Gray hole attack, MANET     

| DOI: 10.17148/IARJSET.2018.5114