Used to be …..
And now …..
According to Citrix Documents : ( Citrix Free Training CXA-104: Citrix XenApp 7.6 Overview)
XenApp 7.6 is built on the “FlexCast Management Architecture” and offers simple , powerful configuration and operations management and cloud-style automation and scalability.
FlexCast Delivery Technology : (FMA) is a collection of services that work together to efficiency deliver hosted applications ad server desktops at scale.
Studio : The studio management console allows you to configure and manage your XenApp implementation.
Director : is the web-based management console that enables IT support and Help Desk teams to monitor and troubleshoot a XenApp environment.
StoreFront : is an integral component of any XenDesktop , XenApp , XenMobile,or VDI-in-a-box implementation .It authenticates users to Microsoft Active Directory and manages the delivery of desktops and applications from your servers in the datacenter to user’s devices.
Citrix Delivery Controller : Authenticates and manages end-user access and brokers connections between end users and their virtual desktops and applications.
Virtual Delivery Agent : (VDA) manages the HDXconnections between physical or virtual machines that host applications and desktops,and endpoints running Citrix Receiver.
Site : is used to organize resources much like a farm in previous releases. A site represents a single deployment and database.
Machine Catalog : is a collection of machines (physical or virtual) managed as a single entry that you allocate to end users through a Delivery Group.
Delivery Group : specifies who can use a set of applications or server desktops,as well as user settings.
Virtual Delivery Agent – VDA :
The VDA manages the HDX connection between virtual machines that host applications and endpoints running Citrix Receiver.
In order to work correctly the VDA must establish communication or REGISTER with Controllers in the deployments. Along with StoreFront and the Controller , the VDA plays an important role in application enumeration and launch process. If the VDA can not register itself with the Controller , users will not be able to launch applications.
When a connection is required , registered VDA’s can retrieve session details such as password encryption level from the Controller.
Registration occurs when :
– The VDA starts
– The Citrix Desktop Services is restarted.
– The Agent heartbeat or a notification is rejected by the Controller.
– The IP address is changed.
– A Network or communication failure occurs.