Citrix Netscaler Interview Questions

Netscaler Load Balancing Persistence to specific member?

In the Netscaler load balancing persistence rules it is straightforward to sticky a client IP to the same member each time.

Can you explain what issue does the NetScaler solves?

The Netscaler technology resolves issues of low speed internet and low bandwidth that needs to stream a desktop from a centralized server. This provides slow streaming compliance on the virtualization solution to provide optimum support and feature on the client machine.

Explain what is Citrix?

Citrix is an application deployment system. With Citrix, one can access the customized application and can also delivered to remote systems. It also allows file transfer from home computer to office computer and e-mail accessing.

List out the Major Citrix components?

Major Citrix components are

XenApp: It allows to host applications on central servers and enables users to interact with them remotely and deliver it to the user’s devices for local executions

XenDesktop: It is the practice of hosting a desktop operating system with a virtual machine running on a remote server

XenServer: It enables you to combine multiple Xen-enabled servers into a powerful resource pool using industry standard shared storage architecture and leveraging resource clustering technology created by XenSource

Provisioning Server: It reduces the number of systems that they manage, even as the computers number continues to grow.

Netscaler: It is used to provide level 4 load balancing

List out the services provided by Citrix?

Service provided by Citrix includes

Citrix virtual memory optimization service

Encryption service

Citrix XTE service

Independent Management architecture

Citrix SMA service

COM (Common Object Model) services

Explain what is Data Store?

Data store is a database which consists of all the configuration information needed by the Citrix farm.  Changes can be made at any time to the Metaframe Server. The changes are persisted in the data store.  It will datastore following information like

Server configuration

User configuration

Print Environment

Published Application

List out the ports associated with Citrix services?

Default port is A: 1494

Default listening port for Citrix XML service: 80

For ICA: 1494

UDP port used for client broadcasting: 1604

IMA port: 2512 and 2513

CMC and SSL port: 443

Server to SQL port: 1433

Session Reliability: 2598

Port Number for licensing: 27000

citrix-logo-

Mention what is the query command in Citrix?

Query command in Citrix includes

qfarm

querydc

queryds

queryhr

Get through the interview bar with our selected interview questions for Citrix Netscaler enthusiasts

Mention what is web interface or Nfuse?

Citrix web interface software provides web access to Java, Unix and Windows applications which are hosted via Citrix application server software. Citrix offers server side control of hosted applications, while Citrix web interface makes applications accessible through a web browser interface.

Explain what is Citrix XML broker?

Citrix XML broker behaves as an intermediary between the web interface and farm.  It receives the credentials of the user from the web interface. It retrieves the applications that have user permission to access.  It is done by independent management architecture and returns to the web interface. XML broker detects the server in the farm, once the user is authenticated.  It returns the address of the service rendering server to the web interface. It functions between IMA service and web interface.

Explain what is the step to clear XenServer cache?

To clear XenServer cache you have to use command Dnscmd Servername/clearcache.

Mention what are the default tests available in Health Monitoring & Recovery Tool?

The tests in XenApp Health Monitoring and Recovery Tool are

Citrix IMA service test

Logon Monitor test

Terminal Service test

XML Service Test

Explain what is LHC in Citrix?

The IMA service executing on each Presentation Server downloads the information it requires from the central data store into a local MDB database known as  the Local Host Cache or LHC.

List out the load evaluators that are supported in Citrix?

Load evaluators that are supported in Citrix includes

Memory Utilization

CPU Utilization

IP Range

Page Swap

Page Fault

Context Switches

Disk Data I/O

Scheduling

Server Application Load

User Application Load

Mention what is the limit of refresh time for Local Host Cache in Citrix?

The refresh time set for Local Host Cache is 30 minutes, it can be created when IMA is stopped.

Explain how you can view the LHC information?

The LHC information is found in the file imalhc.mdb, and this file is available in c:\program files\citrix\independent management architecture\directory.

Explain what is Citrix Receiver?

Citrix receiver is a collection of suite of products that enables client devices to connect to various desktop virtualization services offered by Citrix.  Citrix receiver can link with client devices to XenDesktop applications, XenApp and desktops via the HDX protocol.

Explain what is Citrix Access Gateway?

CAG or Citrix Access Gateway is a universal secured socket layer virtual private network appliances. It got features like IPSec and SSL VPN.  It also enables instant access to the users and secure access to the company.  Any information resource can be retrieved by using CAG with secure, single point access, always on features.  It supports various types of applications including IP telephony.  Any application which is hosted on Citrix Presentation Server can be used in a secured manner.

Explain how you can remove dead server from the Citrix Management Console?

To remove dead server from the Citrix Management Console you have to run

DSVERIFY SERVERS/CLEAN/FORCE for optimizing the Data Store

DSVerify can be executed on any of the servers in the farm

MetaFrame feature release 3 has a command line tool known as DSCHECK

Use the following command DSVerify command line tool DSCHECK/CHECK

or right click on the ‘server in the farm’ and select option ‘remove from the Farm’

Explain what is the purpose of Zones?

Data collector stores information about Zones, User’s Session and Published Application.

A Farm consists of a subset referred as Zones

It consists of various server members

One of the server members is referred as Zone Data Collector

In traffic controlling, Zones are useful

Using ZDCs communication is established among zones

Explain the use of shadowing in Citrix?

In Citrix, shadowing resembles for one user to join remotely to another user.  One user can use the session of another user remotely.

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