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Enabling objects to work intelligently through various communication technologies is a common phenomenon. Objects become intelligent and are allowed to work autonomously through the internet, and the concept is popularly known as the Internet of Things (IoT). Due to the diversity in application areas of IoT, it has various aspects to be concerned about too. The part researchers are more worried about is transferring data among objects securely. This paper aims to discuss numerous security concerns of application layer protocols and to look into various types of attacks that the application layer might suffer.