1Y0-301 · Question #7
A Citrix Engineer needs to add more Delivery Controllers to a site in which the auto-update feature is disabled. What would the engineer need to do in order for the Virtual Delivery Agents (VDAs) to…
The correct answer is D. Update the ListOfDDCs registry key for all VDAs. When auto-update is disabled, VDAs rely on a static registry key to know which Delivery Controllers to contact. Adding new controllers requires manually updating this key on all VDAs.
Question
A Citrix Engineer needs to add more Delivery Controllers to a site in which the auto-update feature is disabled. What would the engineer need to do in order for the Virtual Delivery Agents (VDAs) to communicate with the new Delivery Controllers?
Options
- ARestart the Citrix Desktop Service.
- BRestart the new Delivery Controllers.
- CRun a SQL query and update the site database.
- DUpdate the ListOfDDCs registry key for all VDAs.
How the community answered
(53 responses)- A8% (4)
- B15% (8)
- C4% (2)
- D74% (39)
Why each option
When auto-update is disabled, VDAs rely on a static registry key to know which Delivery Controllers to contact. Adding new controllers requires manually updating this key on all VDAs.
Restarting the Citrix Desktop Service alone will not cause the VDA to discover new Delivery Controllers if the ListOfDDCs registry key has not been updated with the new controller addresses.
Restarting the new Delivery Controllers does not push their addresses to the VDAs; VDAs must be configured to know where to register.
Running a SQL query against the site database does not update the VDA-side registry configuration that controls which controllers a VDA contacts for registration.
The ListOfDDCs registry key (located at HKLM\Software\Citrix\VirtualDesktopAgent) contains the list of Delivery Controllers that a VDA will attempt to register with. When auto-update is disabled, VDAs do not automatically discover new controllers, so the engineer must manually update this registry key on all VDAs to include the new Delivery Controllers, enabling proper communication and registration.
Concept tested: VDA Delivery Controller list registration without auto-update
Source: https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/install-configure/vda-install-scripts.html
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