- This research focused on: understanding the effects of sinkhole isolation or Network Access Control(NAC) isolation on the Wireless sensor Networks System (WSNs). Investigating cryptography-based strategies to limit network degradation caused by the isolation of sinkhole. The WSNs is a self-configuring network that does not have centralized control. Sensing devices are referred to as nodes. The main reasons for this research are to look at the effects of isolation of sinkhole in the wireless sensor Network System, and to look at the steps to be taken to prevent malicious attacks. Malicious can also join the network and launch various active and passive attacks, Malicious attacks have a detrimental effect on the Network and on users of the Internet with insufficient security. it is we who must establish reliable protection. For many applications, security (i.e., confidentiality, integrity and availability of information). The results of this research study was achieved through qualitative technique of primary research. An open-ended interviews are aimed to be conducted with the identified sample population(IT) in which they were given a complete chance to share their opinions and views about asked questions and research problem. Moreover, the sample population of this study includes the individuals from IT industry