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Citrix Interview Questions :-

Q.1 What is Server Farm ?

Ans:- Server farms are groups of servers running MetaFrame Presentation Server that you can manage as a unit, enabling you to configure features and settings for the entire farm rather than configuring each server individually.Servers in a farm share a network connection and a single data store of the farm’s configuration information.
Q.2 What is Independent Management Architecture (IMA) ?
Ans :-Independent Management Architecture (IMA) provides the framework for server
communications and is the management foundation for MetaFrame Presentation
Server. IMA is a centralized management service comprised of a collection of core
subsystems that define and control the execution of products in a server farm. IMA
enables servers to be arbitrarily grouped into server farms that do not depend on the
physical locations of the servers or whether the servers are on different network
IMA runs on all servers in the farm. IMA subsystems communicate through
messages passed by the IMA Service through default TCP ports 2512 and 2513.
The IMA Service starts automatically when a server is started. The IMA Service
can be manually started or stopped through the operating system Services utility.
Q.3 What Independent Computing Architecture (ICA) ?
Ans:- The Independent Computing Architecture (ICA) is the communication protocol by which servers and client devices exchange data in a server environment. ICA is optimized to enhance the delivery and performance of this exchange, even on lowbandwidth connections.
Q4. What Information is stored in Data store ?
Ans:-Persistent farm-wide information (information about published application configurations, available servers, authorized Citrix administrators, trust relationships, and the licenses available) is stored in a data store on the data collector. Although a database of some kind (Oracle, Microsoft SQL Server, MS Access, or IBM DB2, MSDE ( MSDE in no more supported by PS4.5)
• Farm configuration information
• Published application configurations
• Server configurations
• MetaFrame administrator accounts
• Printer configurations
• Trust relationships
Q5. How many server can I have in a Zone ?
Ans:- By default, a single zone supports 512 member servers (prior to MetaFrame XP Feature Release 3, the default was 256 member servers). If a zone has more than 512 member servers, each zone data collector and potential zone data collector must have a new registry setting.This new setting controls how many open connections to member servers a data collector can have at one time.You can configure this value by adding the following value, expressed in hexadecimal notation, to the registry:
CacheEntries (DWORD)
Value: 0x200 (default 512 entries)

Note: If you do not have more than 512 servers in a zone, increasing this value
does not increase the performance of a zone
Q6. What is LHC and where stored ?
Ans:- The local host cache (LHC) is an Access database located on each member server
in %ProgramFiles%\Citrix\Independent Management Architecture. The local host cache is
important as the backup in case the member server temporarily loses access to the data store, but it is also helpful under normal conditions—the member server can read or write information in its local host cache instead of accessing the data store every time it needs something. The cache is populated when the IMA service on the member server starts, then by periodically
(normally, at intervals of 10 minutes; you can edit this setting to improve performance)
Q7. What is Data Collector server ?
Ans:-Zone data collectors are communication gateways between zones in farms that have
more than one zone. Zone data collectors communicate information used by MetaFrame
Presentation Server to list available applications for users and, when users open an application,to locate the most appropriate server on which to run the application.
The server responsible for gathering information about the server farm and making this
information available to all member servers is called the data collector. The data collector gets its information from the member servers in its zone. Any time any of the following events(collectively known as session data) takes place, the member server informs its data collector:
• ICA client logons and logoffs
• ICA session disconnects and reconnects
• Server and application load changes
• License acquisition and release
• Server brought online or goes offline (either reboots or restarts the IMA service)
• Published application changes
• IP and media access control (MAC—the hardwired network card address) address
changes Using this information, the data collector can provide a clear picture of the MetaFrame servers in the farm at any given time: the servers available, the clients using those servers, the load on each server, the licenses in use, the applications available in the farm, and the network address of each server. For faster access, the data collector keeps all session data in RAM. If the data collector doesn’t hear from a member server within the preset interval (by default, 60 seconds), the data collector will ping the member server through IMA to make sure that the server is still online.
Q8. How can I verify Win2K Terminal Services is In Application ServerMode
Ans:- Again, MetaFrame only works on Win2K servers with Terminal Services installed in
Application Server mode, not Remote Administration mode. You can easily check the mode from the Terminal Services Configuration window, located in the Administrative Tools