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Routing Protocol for Low Power and Lossy Networks (RPL) is the only standard protocol that assists the routing process in Low Power and Lossy Networks (LLNs) - based Internet of Things (IoT) applications. However, due to the resource-constrained nature, lack of physical protection and security requirements of the inherent protocol, LLNs are vulnerable to attacks that primarily alter the working of the RPL protocol and disrupt the ongoing communication. Therefore, it is a high profit and desperate target of many attackers. Our work offers a detailed overview of one such significant threat to RPL known as the rank attack. Considering the resource-constrained nature of the IoT devices, we propose and evaluate a lightweight and efficient method to mitigate and isolate the rank attack. Specifically, our approach uses a novel Echelon Metric Based Objective Function (EMBOF) over the default RPL to calculate and check …