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: IoT is the networking of daily use objects. These objects are commonly known as constrained devices. Constrained devices works with low memory, low storage, and low computation power. Implementing security algorithms in these devices is challenging. The researchers take these challenges as opportunity. The diverse and heterogeneous structure of the IoT phenomenon introduces a variety of new security risks and challenges. Many threats such as botnets, home intrusion, remote control of the IoT devices, and man-in-the-middle attack are threatening the IoT environment. Hence it needs a stronger security implementation to protect IoT devices from being compromised. The authors surveys different kinds of networking technologies under an IoT environment, security challenges on them and possible countermeasures for these challenges to form a more secure IoT environment for trustful adoptation of services through industrial or personal use. In this paper, the authors presented the study of numerous networking technologies along with possible threats and their countermeasures.

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