Excessive application of IOT and it’s great impact on peoples daily day to day life is going increasing. Both augmentation and automation IOT makes holds the promising result by improving people’s live. Involve of smart devices with billions of activities are connected to internet rapidly. Despite of the large success of IoT, with increasing device sensing result security and privacy are highest requirement with full of guarantee. Here we present security issues regard to different IOT layered structure in addition prevent of attacks from different IOT protocols on security by using some algorithm, also we discuss different existing solution for different kind of attacks.