Which standard protocol is employed in the public cloud environment for managing identification of various agents and devices?

The standard protocol commonly employed in public cloud environments for managing the identification and authentication of various agents and devices is OAuth. OAuth provides a secure and efficient way for users to grant third-party access to their resources without sharing their passwords. It uses tokens, which can be limited in scope and duration, making it well-suited for applications where users need to interact with multiple web services.

In the context of cloud environments, OAuth is particularly beneficial because it facilitates Single Sign-On (SSO) across different applications and services, allowing users to authenticate once and retain access to multiple resources. This is crucial in scalable and distributed operations typical of cloud services, where various devices and agents need to interact with the system securely.

The other protocols mentioned serve different purposes: Kerberos is primarily used for network authentication in secure environments, RADIUS is commonly used for remote user authentication and network access control, and LDAP is used for directory services and managing user accounts. While all these protocols play important roles in security and access management, they are not specifically designed for managing identification in the same way that OAuth is in a cloud context.