The book provides you with information on how to implement and manage a zero-trust architecture across these different layers of an infrastructure. It is an introduction to the overall purpose of zero-trust and the benefits that zero-trust can bring to an infrastructure, across many different technologies: - Cloud; - Networking; - Identity management; - Operational Technology (OT); - 5G. Zero-trust is not a product, but a way of thinking about design and architecture. Cisco and Microsoft are used as the technology vendors, but the steps and information are equally applicable to other technology vendors. The aim of this book is to provide you with an introduction to the Zero Trust concept and provide you with information that you can use in your cybersecurity work, daily. Zero Trust as a concept in the cybersecurity industry is a new thing and it is poorly defined currently. Zero trust (ZT) is the term for an evolving set of cybersecurity paradigms that move defences from static, network-based perimeters to focus on users, assets, and resources.