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Currently, the Internet of Things (IoT) is the most contentious research subject. However, IoT still suffers from many security problems, and the security concerns are overgrowing with substantial IoT deployment. IoT will remain in danger unless understanding and addressing the security challenges. For this reason, this paper implements a full view of the IoT architecture and describes the characteristics and functionality of each layer. For a deeper understanding of IoT security challenges, we focus on identifying security requirements, and vulnerabilities in each IoT layer. Also, we discuss and classified the different security attacks in IoT.
Ahmid et al. (2021) studied this question.