Internet of Things (IoTs) continue to grow to cover different types of applications to connect us, our appliances, our gadgets, etc. with the Internet. Information uploaded from those devices or exchanged with them is very vital and can affect us significantly. As a result, security threats and attacks that can come through those devices impact us seriously. In this systematic literature review paper, we evaluated security threats and attacks on IoTs based on different categories such as: IoT vulnerabilities, threats and attacks based on IoT architecture layers, and IoT vulnerabilities, threats and attacks based on IoT components. We showed areas of open research based on those categories. Due to the large spectrum of applications for IoTs, we hope that this classification can help researchers in this area focus their research to target one specific domain, category or threats.

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The infrastructure benefits, which are achieved from the MANET architecture is the prime reason for the increase in usage for various purposes. The MANET architecture is made truly seamless with the capabilities of working without the central base stations or without the intervention of the central administration. The architecture for a MANET network is highly diversified and completely depends on the formation as the nodes in the MANET network can roam freely with a subsequent connection to any external device or any external networks. Yet another primary benefit of these devices and the networks are operability of the networks and the nodes without any human interventions. This property of the MANET network nodes makes the MANET devices operable in extreme conditions, where the human interventions are nearly impossible. In spite of these uncountable benefits, the MANET networks and the devices, which are part of the networkare always subjected to attacks from various sources. In this work, the attacks types for each network layer are identified and addressed to be prevented. The measures listed in this work are convertible as a modular component of any automated framework to make the complete attack prevention mechanism automated