Which feature is essential for establishing user access to applications hosted in Zscaler's environment?

Establishing user access to applications hosted in Zscaler's environment strongly relies on Single Sign-On (SSO) functionality. SSO simplifies the user experience by allowing individuals to access multiple applications with one set of credentials. This not only enhances user convenience by reducing the number of passwords they need to remember but also streamlines the login process, thereby improving productivity.

Furthermore, integrating SSO into Zscaler's architecture facilitates secure access management, as it centralizes authentication across various applications. This means that once a user is authenticated via SSO, they can seamlessly access various services within the Zscaler cloud without needing to re-enter their credentials for each application, which enhances both user experience and security.

While other features like Multi-factor Authentication and user roles management are important security measures, they function effectively alongside SSO but do not necessarily establish access on their own. Multi-factor Authentication adds an extra layer of security but does not provide the single sign-on experience users expect. Similarly, managing user roles and permissions is crucial for governance and security but occurs after the access has already been granted through authentication processes like SSO.