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Amazon, Microsoft, or Google datacenter; or residing at a special‐ ized hosting provider. The security team is responsible for the sys‐ tem's integrity regardless of where it resides. These challenges are certainly daunting, but they are not insur‐ mountable. The goal of this book is to help managers and leaders understand the challenges of migrating to and securing a multicloud infrastructure. In this book, you learn about ways to manage and orchestrate multicloud environments, including some "edge" tech‐ nologies that are designed to secure and protect your environment. What Is a Multicloud Architecture? Cloud architecture is generally broken down into two different types of deployments: multicloud and hybrid cloud. Multicloud architec‐ tures, in which multiple services are hosted by different cloud pro‐ viders, are the most common deployment. In one example of a multicloud deployment, Domain Name System (DNS) services are hosted by one cloud provider, web applications are hosted by another, a helpdesk ticketing system is hosted by a third provider, and so on. This type of multicloud deployment involves multiple cloud providers, each with a standalone function operating rela‐ tively interdependently across multiple providers. Although multicloud deployments might seem straightforward, keeping track of the different capabilities of each vendor and ensur‐ ing that updates and policies are correctly applied across all cloud partners can be very challenging. In a multicloud architecture, com‐ plexity stems from the process of managing the environment in the context of various shared responsibility models and geographic con‐ siderations. This type of architecture also means that each provider is a single point of failure for your organization. A hybrid cloud is generally considered a combination of a public and private cloud, but this definition has been expanded to mean on- premises and cloud in some contexts. According to the National Institute of Standards and Technology (NIST), "the hybrid cloud infrastructure is a composition of two or more distinct cloud infra‐ structures (private, community, or public) that remain unique enti‐ ties, but are bound together by standardized or proprietary technology that enables data and application portability (e.g., cloud bursting for load balancing between clouds)." 2 | Chapter 1: Why Multicloud Architecture?

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