The term IoT (Internet of Things) refers to physical things or objects having different types of sensors, ability to process, software and other technologies that helps to connect and exchange data with other systems over the internet. Whether it comes to simple coffee machine or big things like car or health care, agriculture, smart cities etc., IoT has developed a person’s living with his minimal involvement. Since, these IoT devices and other components used with it are having less memory, less computational capability makes them vulnerable to many types of attacks. The most common type of attack that takes place on it is DoS/DDoS, where an authorized user is restricted from accessing some service on internet. This paper focuses on security requirements at different IoT layers, issues related to DDoS attack and provides review on its countermeasures.

Keywords: DDoS, DoS, Security, internet of things