Therefore, in this paper, we give a complete review of the protocols that are usually used in ICS. Then, we give a comprehensive review on network security in terms of Defence in Depth (DiD), including data encryption, access control policy, intrusion detection system . The solution provides a proven and validated blueprint for connecting Industrial Automation and Control Systems (IACS) and production assets, improving industrial security, and improving plant data access and operating reliability. Following this best practice blueprint with Cisco market-leading. This solution replaces the Visibility recommendations in the Network Security CVD which outlines security visibility achieved via a combination on Cisco Identity Services Engine (ISE) and FactoryTalk® Network Manager™ (FTNM). Their architecture is designed with multiple layers to ensure efficiency, reliability, and stability. This document provides a structured overview of ICS architecture, communication networks, redundancy and security. Industrial Control Systems (ICS), which include Supervisory Control and Data Acquisition (SCADA) systems, Distributed Control Systems (DCS), and Programmable Logic Controllers (PLC), play a crucial role in managing and regulating industrial processes.
