What is the effect of an information banner in ArcGIS Enterprise?

The effect of an information banner in ArcGIS Enterprise is to notify users of important changes or downtime. This feature is particularly valuable for informing users about maintenance schedules, updates, or any significant changes that could affect their use of the system. By displaying a banner prominently within the user interface, administrators can communicate essential information directly to users, ensuring that they are aware of any potential disruptions or new features that may impact their operations. This proactive communication helps to manage user expectations and enhances the overall user experience.

The other choices focus on functionalities that do not accurately describe the purpose of the information banner. Restricting user access or enhancing interface functionalities are not roles served by the banner. While the banner appears upon login, its primary goal is communication rather than an automated launch without context. Thus, the selection that highlights its role in user notification is indeed the correct interpretation of its function.