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Citrix Interview Questions and Answers

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Interview Question and Answers

Citrix Interview

GeekInterview.com is an Open Database where you can share interview questions, comment /

answer any questions. Each question is like discussion thread that helps you to learn and

understand each question and answer in detail instead of just reading them.

Preparing for a job interview can be a stressful experience, especially for fresher’s. Considering

that you are an aspiring candidate seeking out to begin your career in Citrix, it is imperative

that you thoroughly be prepared, in order to stand a good chance of getting hired.

Among the things that you need to plan and prepare for would be the questions that will most

likely be asked during your interview. Preparation is the key to making a good first impression,

particularly for first-time applicants. Consequently, lack of preparation could lead to

nervousness and inability to answer questions satisfactorily. I will help you do well during your

interview, which is why this e-Book has been created to specifically guide you on how best to

answer 30 very common Citrix interview questions.

Target Audience

This guide is designed to help anybody who is planning to attend Citrix job interview in any

company, big or small. With the Citrix interview question and answers provided in this e-Book,

you can better prepare for the interview and feel more confident during the question and

answer session with your interviewer.




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Disclaimer

This Citrix Interview Questions and Answers eBook contains 28 question and answers. All

explanation and answers are based on user submitted comments and opinion. Exforsys Inc is

not responsible for correctness of the same.




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Table of contents

1. What is datastore in Citrix? ............................................................................................................................................... 2

2. What will happen if LHC in Citrix corrupted? .............................................................................................................. 2

3. What is time out feature in Citrix? How to enable this feature? ........................................................................... 2

4. If any user gets error that resources is unavailable in citrix than what will you do? ..................................... 3

5. What will happen if data store down in Citrix? ........................................................................................................... 3

6. What will happen if Citrix license server goes down? .............................................................................................. 4

7. Hybrid automation framework structure ....................................................................................................................... 4

8. Why is ICA that much faster than RDP? What is the technological difference between the two? .......... 5

9. What are the consoles available to manage citrix server? ..................................................................................... 5

10. What is the citrix xml service? ....................................................................................................................................... 5

11. What is pvs and why would you use it? ..................................................................................................................... 5 12. What is a ZDC and why is it recommended to have a dedicated one when there are more than 5 XenApp servers?.......................................................................................................................................................................... 6

13. How do you repair the ima localhost cache? ............................................................................................................ 6

14. How the licensing works in citrix and difference in citrix licensing version wise? ........................................ 7

15. What group policy file would you edit to add custom drive letters for the purpose of hiding them from

users when they login to a xenapp server? ...................................................................................................................... 7

16. What is ICA and what are the advantages of ICA? ................................................................................................ 8

17. What is client lock down? ............................................................................................................................................... 8

18. What are different load evaluators are available in Citrix? .................................................................................. 8

19. How to implement policies in Citrix ................................................................................................ 9

20. What is printer terminology in Citrix? ......................................................................................................................... 9

21. What are different load evaluators are available in Citrix ............................................................... 10

22. How to recover when IMS failing? ............................................................................................................................. 11

23. What is the requirement for Citrix server installation? ........................................................................................ 12

24. What are the query commands in Citrix? ................................................................................................................ 12

25. What are the different ports use in Citrix? .............................................................................................................. 12

26. How to recover when datastore is failing? .............................................................................................................. 14

27. What will you check when any user is not able to launch citrix application? ............................................... 14

28. What is the requirement of installation manager and what kind of extension its support? .................... 14

Additional Resources ........................................................................................................................ 16




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1. What is Datastore in Citrix?

Asked by Jaimishra | Answer contributed by: Zen

It is a database that has information of Citrix farm like XenApp server, Data collector, Zone,

Citirx policies, printers, license server, ports etc... It provides this information to all Citrix

XenApp server in the form of Local Host Cache(LHC) you could use either of SQL, SQL express,

DB2 depending on size of your farm.

Read More Answers / Improve Answer

2. What will happen if LHC in Citrix corrupted?

Asked by Needvicky | Answer contributed by: Ganesh

If LHC is corrupted, the server communication with the datastore would be affected; as a result,

server will not be able to handle user requests for applications; IMA service would fail to start

and you will have recreate LHC

Answer contributed by: Audumbar Gavali

You cannot access application from that server.

IMA will not start

Recreating LHC will fix the issue.


3. What is time out feature in Citrix? How to enable this feature?

Asked by Needvicky | Answer contributed by: Ganesh

There are two types of time out:

• Web Interface Time out

• Time out from the XenApp servers



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1) Web Interface time out is configured under web interface management

Console -> session preferences.

2) Server time out is configured either via local policy/GPO or through terminal server

configuration manager -> Environment Settings


4. If any user gets error that Resources is unavailable in Citrix than what will you do?

Asked by Needvicky | Answer contributed by: Audumbar Gavali

- Check the application server is function correctly [hung...etc]

- Communicate with LIC. Server not broken

- Check for IMA service


5. What will happen if Data store down in Citrix?

Asked by Needvicky | Answer contributed by: Lokesh M

If Data store is down then MetaFrame administrators will not be able to edit any configurations

in the Management Console such as publishing applications and new MetaFrame Presentation

Servers cannot be added to the farm.








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6. What will happen if Citrix License server goes down?

Asked by Needvicky | Answer contributed by: Varaprasad Gevin

If Citrix License Servers goes down…. Citrix application will work until 60 days of basic grace

period of the Citrix License server. After 60 days farm cant be able to serve an apps to Citrix

XenApp users.


7. Hybrid Automation Framework Structure

Asked by Guest | Answer contributed by: Lokesh M

As the name implies, Hybrid framework is a combination of many frameworks.

Frameworks such as Data Driven Framework, Keyword Driven Framework and Functional

Decomposition framework are combined together to form a Hybrid framework.

These are also known as Dual Function Automation Framework.

They support several application environments and offer reusability, easy development, and

maintenance of test scripts, customize and configure client settings.

One can read more about Hybrid Framework by author BHARATH MARRIVADA who has written

extensively about Hybrid Framework model.







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8. Why is ICA much faster than RDP? What is the technological difference between the two?

Asked by Smriti0001 | Answer contributed by: Syed Nazar

ICA also has several features that RDP just doesn't support yet. ICA enables application

publishing -- where the application is on one server but is available across the cluster -- session

shadowing, anonymous users, audio support, and drive, printer and port mapping ICA is also

built into Internet Explorer and is available as a free plug-in for Netscape. RDP doesn't permit

applications to run in a browser.


9. What are the consoles available to manage Citrix server?

Asked by Sk_Naresh | Answer contributed by: Chandra Shekar

1) Citrix Management Console

2) Access Management Console

3) License Management Console


10. What is the Citrix XML Service?

Asked by Tligon | Answer contributed by Ramesh Nambaru

Citrix XML Service (CtxHttp) is installed as a service.

For application discovery and configuration information, XML service should be up and running.








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11. What is PVS and why would you use it?

Asked by Tligon | Answer contributed by: Donna

Provisioning Server (PVS). A Provisioning Server is any server that has the Stream Service

installed. It is used to stream software from vDisks as needed, to target devices. In some

implementations, vDisks reside directly on the Provisioning Server.

In larger implementations, Provisioning Servers obtain the vDisk from a network storage device.

Provisioning Servers also retrieve and provide configuration information to and from the

Provisioning Server database. Provisioning Server architecture includes options to ensure high

availability and load balancing of connections between target devices and their vDisks.


12. What is a ZDC and why is it recommended to have a dedicated one when there are more than 5 XenApp servers?

Asked by Tligon | Answer contributed by: Ezhil Arasan

ZDC - Zone data collector, It is always good to have a dedicated ZDC for a zone so that it will

have the complete information of the servers in that zone and it will supply the information

about the least loaded server to the web interface or the NetScaler while user is longing on to a

particular application.


13. How do you repair the IMA localhost cache?

Asked by Tligon | Answer contributed by: Suryanarayan Balakrishnan

IMPORTANT: The data store server must be available for dsmaint recreatelhc to work. If the

data store is not available, the IMA service cannot start.

1. Stop the IMA service on the XenApp server, if it is started. This can be done using the

command: net stop IMA service, or from services.






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2. Run dsmaint recreatelhc, which renames the existing LHC database, creates a new database,

and modifies the following registry key HKEY_LOCAL_MACHINESOFTWARE Citrix IMA Runtime

PSRequired key to 1. Setting the value PSRequired to 1 forces the server to establish

communication with the data store in order to populate the Local Host Cache database. When

the IMA service is restarted, the LHC is recreated with the current data from the data store.

3. Restart the IMA service. This can be done via the command line, net start

IMA service, or from services.


14. How the licensing works in Citrix and difference in Citrix Licensing version wise?

Asked by Sk_naresh | Answer contributed by: Suryanarayan Balakrishnan

Standard License - For single Server

Advanced License - Supports Network Load Balancing

Enterprise License - For large Infrastructure provides WMI, Load Manager or Resource

Manager

Platinum License - Features like Access Gateway and password manager is enabled, edge site

server, etc

For Citrix you would require:

1. Microsoft OS license for the server

2. Terminal Server License (calls)

3. Citrix Server License







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15. What group policy file would you edit to add custom drive letters for the purpose of hiding them from users when they login to a XenApp server?

Asked by Tligon | Answer contributed by: Navjotg

User Configuration | Administrative Templates | Windows Explorer | "Hide these specified drives

in My Computer" and "Prevent access to drives from My Computer"


16. What is ICA and what are the advantages of ICA?

Asked by Sk_naresh | Answer contributed by: Sandipjoshi99

ICA - Independent Computing Architecture

It provides better compression

Transmits High-level windows display information


17. What is Client Lock Down?

Asked by Irfanindi | Answer contributed by: Dhingra.kamal

Typically 'client lockdown' is the process of securing an endpoint so that the user can only

access authorized features. An example of this would be turning the device into a 'Thin Client'

by locking it down so that an end user can only connect to published apps or desktops and

cannot use other features.








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18. What are different load evaluators are available in Citrix?

Asked by Sk_naresh | Answer contributed by: Kulwinders

1. Default Load Evaluators

2. Advance Load evaluators

3. Custom load evaluators


19. How to implement Policies in Citrix

Asked by Sk_naresh | Answer contributed by: Anilkumarsn

The Citrix policy can be applied through Console Management in 3 levels

1. Farm Level

2. Citrix Server Level

3. Policy Level


20. What is Printer terminology in Citrix?

Asked by Sk_naresh | Answer contributed by: Anilkumarsn

Citrix Printing can be configured 3 ways (types)

1. Local Printing

2. Network Printing

3. Client Printing






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Client Printer: The printer connected to the Workstation & the drivers are installed on the

Citrix server for printing.

Network Printer: The Printer connected to the print server & the drivers should be available

on the Citrix server.

Local Printer: The printer connected to locally to the Citrix server & the driers are installed for

the print operation.


21. What are different load evaluators are available in Citrix

Asked by Irfanindi | Answer contributed by: Amodketkar

Different Types of Citrix Load Evaluators

1) CPU Utilization

2) Memory Utilization

3) Page Swap

4) Application User Load

5) Context Switches

6) Disk Data I/O

7) Disk Operations

8) IP Range

9) Page Faults

10) Scheduling

11) Server User Load







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22. How to recover when IMA failing?

Asked by Sk_naresh | Answer contributed by: Irfanindi

There can be a number of reasons why the IMA Service appears not to have started, including

the following:

IMA Service load time

IMA Service subsystem

Missing Temp directory

Print spooler service

ODBC configuration

Roaming Profile

Examine the following Windows Registry setting:

HKEY_LOCAL_MACHINESOFTWARECitrixIMARuntimeCurrentlyLoadingPlugin

If there is no value specified in the CurrentlyLoadingPlugin portion of the above Windows

Registry entry, then either the IMA Service could not connect to the data store or the local host

cache is missing or corrupt.

If a CurrentlyLoadingPlugin value is specified, the IMA Service made a connection to the data

store and the value displayed is the name of the IMA Service subsystem that failed to load.

Missing Temp Directory

If administrators see an IMA Service Failed error message with an error code of 2147483649

when starting the MetaFrame XP Presentation Server, the local system account might be

missing a Temp directory, which is required for the IMA Service to run.

To gain further insight into the situation, change the IMA Service startup account to the local

administrator and restart the server. If the IMA Service is successful in starting under the local

administrator account, then it is likely that a missing Temp directory for the local system

account is causing the situation.




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If the Temp directory is not present, then manually create one as >Temp. For example:

C: WinntTemp

Also, verify that the TMP and TEMP system environment variables point to the temporary

directory. Restart the server to restart the IMA Service


23. What is the requirement for Citrix server installation?

Asked by Sk_naresh | Answer contributed by: Venu_urc

Windows 2003 Server

Terminal Services,

Terminal Services Licenses,

Citrix P.S 4.0

Citrix Licenses

Citrix Clients


24. What are the query commands in Citrix?

Asked by Sk_naresh | Answer contributed by: Halvendira

1) qfarm

2) querydc

3) queryds

4) queryhr








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25. What are the different ports use in Citrix?

Asked by Sk_naresh | Answer contributed by: Sateesh_wsa

Some Citrix Port Numbers

1494: Any client using the TCP protocol to communicate with the Presentation Server uses this

port. You will need to open this port on your firewall for inbound connections unless you are

using some form of encapsulation or encryption. You can change the port using the ICAPORT

command but I find it to be more trouble than it is worth.

1604: Called the ICA Browser port this is a UDP port that can be used by the Program

Neighborhood to enumerate applications. You probably will not use this though.

80: This is the default port used by the XML service and is used by clients who enumerate

applications with the TCP+HTTP or XML protocol. You will thus need to open this port on your

firewall for inbound connections if clients will be using it to locate servers. You can change the

port easily enough using the CTXXMLSS command.

443: This is the default SSL. The SSL Relay will use it to secure communications between the

Web Interface and the server farm. You could also use it to secure client communication to the

web Interface or use it for client connections to the Presentation Server.

5000: The Presentation Server uses this port to communicate with the IBM Db2 server hosting

the data store.

1521: This port is used to communicate with the Oracle data store.

1433: The port used to communicate with a Microsoft SQL data store.

2512: This port is used for server-to-server communication such as when load information is

communicated. The port used to access the data store is saved in the

HKLMSOFTWARECITRIXIMAIMAPORT key on the server containing the data store. All other

servers use the port number saved in HKLMSOFTWARECITRIXIMAPSSERVERPORT key in the

registry to access the data store. Have a look at IMAPORT to see how to change it.

2513: This port is used by the Presentation Server Console when connection to a server. Have

a look at IMAPORT to see how to change it.




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2598: This is the session reliability port number and needs to be opened on your firewall if the

ICA Clients will be using session reliability when communication with the server.

27000 and a random port number: This is the port used for communication between the Citrix

License server and the Presentation Servers. Remember that the Citrix vendor daemon running

on the license server uses a random port. It tracks license usage.


26. How to recover when Datastore is failing?

Asked by Sk_naresh | Answer contributed by: Ujjalalokesarkar

Data store can be recreated by the *.mdb file which is located at %program

files/Citrix/Independent Architecture Management%

This file can be moved to another server and a data base connectivity and be created using

ODBC and creating a *.dsn file.


27. What will you check when any user is not able to launch Citrix application?

Asked by Sk_naresh | Answer contributed by: Sateesh_wsa

1) First try to launch same application from Citrix server (on which you installed and published)

2) Try to add same application to your ID and try to launch

3) Check user permissions for that Applications

4) Verify that latest Citrix client software installed at desktop

5) Verify that user is having correct proxy settings to connect to your Citrix network (for remote

users)








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28. What is the requirement of Installation Manager and what kind of extension its support?

Asked by Sk_naresh | Answer contributed by: Jijinvp

Installation Manager is a powerful feature in MetaFrame XPe that facilitates the rapid

installation of applications and other software components.

Installation manager let you install applications other software components to any or all-

available servers in your farm-attended or unattended-using any MetaFrame XP server on the

network regardless of physical location, network connection type or hardware set up.

It supports extensions like ADF MSI and MSP.


Read more Citrix related interview question and answers.

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