The choice of Azure Arc is particularly appropriate for managing the security posture of Azure IoT Edge devices and AWS EC2 instances because it provides a unified approach to managing resources that are not solely within Azure but across various environments, including on-premises and multi-cloud setups.
Azure Arc extends Azure management services to any infrastructure, allowing organizations to implement a consistent security posture across hybrid and multi-cloud environments. With Azure Arc, you can bring Azure services and management capabilities to those devices and instances, including governance, security management, and compliance features. This means that both Azure IoT Edge devices and AWS EC2 instances can be managed under a single framework, ensuring that security policies and standards can be effectively applied and monitored across different platforms.
While Azure Security Center is beneficial for Azure resources, its focus is primarily on resources within the Azure ecosystem. Microsoft Defender for Cloud Apps addresses security for cloud applications rather than specifically for IoT devices and EC2 instances. The Microsoft Security Compliance Center is focused on managing compliance rather than security posture specifically, making Azure Arc the most comprehensive tool for the stated requirements.