An loT sensor in an organization generated an emergency alarm indicating a security breach. The servers hosted in an loT layer accepted, stored, and…

The scenario describes functions such as accepting data from gateways, storing it on servers, processing it, and creating dashboards for analysis. These are characteristic activities of the Cloud Layer in a typical IoT architecture. This layer leverages the scalability and computational power of cloud infrastructure to perform large-scale data ingestion, storage, complex analytics, and visualization. It acts as the central brain of the IoT system, transforming raw data from sensors into actionable insights that are presented to users via dashboards and applications.

A. Device layer: This layer comprises the physical sensors and actuators. It is responsible for sensing the environment and generating raw data, not for processing, storing, or creating dashboards.
C. Process layer: Also known as the Business Layer, this layer uses the insights and analysis provided by the Cloud Layer to integrate with business processes and execute high-level decisions.
D. Communication Layer: This layer, also called the Network Layer, is responsible for the secure transmission of data from the device layer (via gateways) to the Cloud Layer. It does not perform data analysis.

1. Al-Fuqaha, A., Guibene, W., Habibi, M. A., Sun, X., & Mohammed, N. (2015). A survey on the IOT: Architecture, enabling technologies, security and privacy, and applications. IEEE Communications Surveys & Tutorials, 17(4), 2415-2476. In Section III-A, "Architectures," the Application Layer (which is hosted in the cloud) is described as being responsible for delivering application-specific services to the user, which includes data processing and visualization. (DOI: 10.1109/COMST.2015.2444095)

2. Sethuraman, S. C., & Trewyn, J. (2018). A Reference Architecture for the Internet of Things. Carnegie Mellon University, Software Engineering Institute. CMU/SEI-2018-TN-012. On page 10, Figure 4 illustrates the "Cloud/Enterprise" tier, which contains components for "Data analysis and processing" and "Data storage," explicitly matching the functions described in the question.

3. Ray, P. P. (2018). A survey on Internet of Things architectures. Journal of King Saud University-Computer and Information Sciences, 30(3), 291-319. Section 3.2 discusses the cloud-based architecture, stating, "The cloud based IoT architecture consists of a cloud which is used to store and process the data... The cloud provides facilities for data analysis, visualization and interpretation." (DOI: 10.1016/j.jksuci.2016.10.003)