A Citrix Engineer needs to return an environment back to normal operations after a Disaster Recovery (DR) occurred. Which two tasks does Citrix recommend to move the users from the backup datacenter to the primary datacenter? (Choose two.)

The process of returning operations from a Disaster Recovery (DR) site to the primary datacenter is known as "failback." The core objective is to redirect user traffic in a controlled manner. The two essential and recommended tasks are to first re-establish connectivity to the production environment by enabling access to the primary datacenter. Concurrently, to prevent new user sessions from being established at the temporary DR site, access to the DR datacenter must be blocked. This ensures a smooth transition where all new and reconnecting users are directed to the restored primary infrastructure.

A. Terminating existing user sessions is a disruptive action. A graceful failback allows current sessions to continue until users log off naturally, while new sessions are directed to the primary site.
D. Blocking access to the primary datacenter is the opposite of the required action. Access must be enabled to allow users to connect to the restored production environment.
E. Enabling access to the Disaster Recovery datacenter is incorrect as users are already operating from this site during the DR event. The goal is to move users away from it.

1. Citrix Virtual Apps and Desktops Documentation - Manage Delivery Groups: The process of failback involves manipulating resource availability. An administrator would enable the Delivery Groups in the primary datacenter and disable the Delivery Groups in the DR datacenter. This directly corresponds to enabling access to the primary site and blocking access to the DR site. (See section: "Enable or disable a delivery group").

2. Citrix StoreFront Documentation - Manage Delivery Controllers: During a failback, the configuration in StoreFront is reversed from the failover state. The Delivery Controllers for the primary site are re-enabled, and the controllers for the DR site are disabled. This action directs all enumeration and launch requests to the primary datacenter. (See section: "Add, edit, or remove delivery controllers").

3. Citrix Tech Zone - Design Decision: Active/Passive Disaster Recovery: This official design guide describes the failback process as the reverse of the failover. The failover process involves redirecting users to the DR site. Therefore, the failback process involves redirecting users back to the primary site, which is accomplished by making the primary site accessible and the DR site inaccessible for new connections. (See section: "Failback Process").