1Y0-204 Citrix Virtual Apps and Desktops 7 Administration Questions and Answers

 In general, to improve HDX session performance for high-latency, low bandwidth connections, administrators can configure settings that reduce the amount of data transferred and the resources required. This includes optimizing the visual experience (B, D, E) by adjusting the frame rate, color depth, and video quality.

According to the Citrix Virtual Apps and Desktops 7 Deployment and Administration guide, the expression CLIENT.SSL.CLIENT_CERT.VALID_NOT_AFTER.EQ(GMT2020) checks whether the client certificate is valid until the specified date (GMT2020). The other expressions are either incorrect or irrelevant for this requirement.

Without a bound SSL certificate, the SSL virtual server cannot establish secure connections and will be in a DOWN state.

• According to the Citrix documentation, “To enable SSL offloading for a virtual server, you must bind an SSL certificate to the virtual server.”
• The image you sent shows the configuration commands for setting up an SSL virtual server and services. However, there is no command to bind an SSL certificate to the virtual server.
• Therefore, the correct answer is D. The SSL Certificate is NOT bound to the virtual server.

https://docs.citrix.com/en-us/citrix-adc/13/ssl/ssl-offload-howto.html

 According to the Plan your StoreFront deployment document, for single server deployments you can install StoreFront on a non-domain-joined server but certain functionality will be unavailable; otherwise, StoreFront servers must reside either within the Active Directory domain containing your users’ accounts or within a domain that has a trust relationship with the user accounts domain unless you enable delegation of authentication to the Citrix Virtual Apps and Desktops sites or farms. All the StoreFront servers in a group must reside within the same domain. Therefore, server groups are not supported for non-domain-joined StoreFront servers (option D). Also, according to the User authentication document, when you configure a store, you specify the type of authentication service to use. By default, users are authenticated on StoreFront. Alternatively, you can delegate authentication to Citrix ADC or to the Delivery Controllers (option E). Authentication does not occur at the Domain Controller (option A) or at the Citrix ADC (option C) by default. Two-factor authentication is supported for non-domain-joined StoreFront servers (option B) as long as the authentication is delegated to Citrix ADC or Delivery Controllers.

The Delivery Controller runs the Secure Ticket Authority (STA) and the Citrix XML Service, which are responsible for issuing session tickets in response to connection requests for published applications and desktops on Citrix Virtual Apps and Desktops12. The Citrix Gateway can be configured to use the STA to validate the tickets and allow secure access to the resources3.

1: Access Citrix Virtual Apps and Desktops resources with the … - NetScaler 2: FAQ: Citrix Secure Gateway/ NetScaler Gateway Secure Ticket Authority 3: Configuring the Secure Ticket Authority on NetScaler Gateway

 Profile streaming ensures that only the files and folders that a user needs are downloaded to the VDA during logon and logoff. This reduces logon and logoff times and allows users to access their profiles in the event of network interruptions or VDA failures1

1: https://docs.citrix.com/en-us/profile-management/current-release/configure/profile-streaming.html

 According to the Citrix Virtual Apps and Desktops 7 Deployment and Administration course, the Generate Support File option on the Citrix ADC appliance allows the administrator to collect logs and configuration information for troubleshooting purposes. The support file can be downloaded and sent to the Citrix Support Engineer for analysis. The other options are not relevant for this scenario.

 According to the screenshot, the CS policy CS1_Pol has a rule that matches the HTTP request http://xenapp.training.lab/url1, since it contains “/url1/” in the URI path. This policy is bound to the CS vServer CS_LB_HTTP with a priority of 100, which means it has a higher precedence than the CS policy CS2_Pol, which has a priority of 110.  Therefore, the request will be redirected to the target LB vServer specified by CS1_Pol, which is LB_vserver1

The identity disk is a small disk attached to each virtual machine that stores the unique information for that machine, such as computer name, IP address, and Active Directory account. This disk is created when using Machine Creation Services with the Desktop Experience set to ‘Random’.1

1: Identity disks

 According to the Citrix documentation, the -denySSLReneg parameter specifies the type of SSL renegotiation that the Citrix ADC denies. The possible options are:

• NONSECURE: Deny renegotiation requests from a client if the initial handshake between the Citrix ADC and the client is not secure. A secure handshake is one in which both parties prove their identities to each other by presenting valid certificates.
• FRONTEND_CLIENT: Deny renegotiation requests from a client on a front-end SSL connection, regardless of whether the initial handshake is secure or not. A front-end SSL connection is one in which the Citrix ADC communicates with the client over SSL.
• ALL: Deny all renegotiation requests from a client on a front-end SSL connection and from a server on a back-end SSL connection. A back-end SSL connection is one in which the Citrix ADC communicates with the server over SSL.
• NO: Allow all renegotiation requests.

Therefore, the correct answer is A and C.

 According to the IBM documentation1, the Corrupt qualifier is used to modify the HTTP header of an HTTP request. The Corrupt qualifier changes the current value to a different value for a request or response header. If a value exists for the header, then this value is changed equivalent to a regular expression search and replace.

A SSL profile is a collection of SSL settings that define the SSL behavior of a virtual server. A Citrix Administrator can use SSL profiles to apply the same SSL settings to multiple SSL virtual servers, which simplifies the configuration and management of SSL parameters1.

1: SSL Profiles

When using an HDX Session printers policy, print jobs sent to a printer managed by the print server are routed directly to the network print server and then to the specified printer3.

 Installing the Cloud Connector on a machine template (before cloning) is not supported. If you clone a machine with the Cloud Connector installed, the Cloud Connector services won’t run and the machine can’t connect to Citrix Cloud1. Therefore, the administrator should provision each machine from a cloned machine template and install the Cloud Connector software on them. This way, the Cloud Connectors can communicate with Citrix Cloud and register with the same resource location2.

1: Cloud Connector Installation | Citrix Cloud 2: Install Cloud Connectors from the command line | Citrix Cloud Government

According to the Delivery Controllers document, Citrix recommends having at least two Controllers on different physical servers for redundancy and scalability in a production site. The document also states that “additional Controllers enable you to handle more users and more applications and desktop requests, and can improve overall responsiveness.” Therefore, the minimum number of Delivery Controllers required to deploy Citrix Virtual Apps and Desktops for 500 users is 2.

According to the Citrix documentation1, when user subscriptions are disabled for a store (Mandatory Store), the following behaviors occur:

• Users cannot subscribe to applications from the store. All the applications in the store are automatically subscribed to each user and appear in Citrix Workspace app.
• Users cannot remove applications from Citrix Workspace app on the Favorites screen.
• Users can organize their applications into folders using the Citrix Workspace app desktop.
• Applications are placed in the Start menu or the Applications folder on the user’s device, depending on the Citrix Workspace app version and operating system.

Therefore, the correct answer is B and D.

1: Configure user access

According to the Citrix Virtual Apps and Desktops 7 2308 documentation1, the default printing behavior when no printing policy is configured is to auto-create all client printers. This means that the system automatically creates printers in the user session that correspond to the printers defined on the user device. This option provides users with access to the same printers in a session as they have on their user devices.

1: Printing policies and preferences | Citrix Virtual Apps and Desktops 7 2308

The NSIP address is the NetScaler-owned IP address that uniquely identifies the NetScaler on your network, and it provides access to the appliance. By default, the NSIP is the source IP address for packets originating from the NetScaler appliance, such as packets destined for NTP servers1.

1: Configuring NetScaler-owned IP addresses | Networking

The commands in the screenshot create a responder action and policy that modify the DNS response from the Citrix ADC to the client. The responder action uses the DNS.NEW_RESPONSE function, which creates a new DNS response with the specified parameters. The first parameter is true, which means the response will have the TC (truncated) bit set. The second parameter is true, which means the response will have the AA (authoritative answer) bit set. The third parameter is NOERROR, which means the response will have the rcode (response code) set to NOERROR. The responder policy matches the DNS requests that use UDP as the transport protocol and applies the responder action to them. Therefore, the effect of this configuration is to create a DNS response with TC bit set and rcode as NOERROR for UDP requests. This can be used to prevent DNS amplification attacks by limiting the size of the DNS response.

Typically, Citrix Director is used for monitoring and managing user sessions, including machine sessions and application instances. The “Filters” option allows administrators to view and manage specific sessions, which aligns with the scenario described.

According to the Citrix documentation1, the triggerMonitor parameter specifies the conditions under which the service monitor is invoked. The possible values are:

• ALWAYS: The service monitor is always invoked.
• MEPDOWN: The service monitor is invoked only when Metric Exchange Protocol (MEP) has marked the service as DOWN for any reason.
• MEPSUSPECT: The service monitor is invoked only when MEP has marked the service as SUSPECT.
• NONE: The service monitor is never invoked.

Therefore, the command set gslb site SiteB –triggerMonitor MEPDOWN will set the triggerMonitor value to MEPDOWN for SiteB, which means the service monitor is invoked only when MEP has marked the service as DOWN for any reason.

1: https://docs.citrix.com/en-us/citrix-adc/13/gslb/configure-gslb-site.html

 The administrator should negate the expression of the Responder policy to avoid the HTTP callout recursion issue. According to the Citrix documentation, “If you configure an HTTP callout policy that is bound globally, you must ensure that the policy expression does not match the callout request. Otherwise, thecallout request will trigger the policy, resulting in a callout recursion.” The expression in option B ensures that the policy does not match the callout request by adding the NOT operator at the end.

https://docs.citrix.com/en-us/citrix-adc/13/appexpert/http-callout/http-callout-policy.html

According to the Prepare to install article, the First-Time wizard automatically pops up when the appliance is configured with the default IP address (192.168.100.1) or when licenses are not present on the appliance. Therefore, options C and D are correct. Options A and B are not related to the First-Time wizard.

According to the Citrix Secure Web Gateway 12.1 documentation1, Citrix Secure Web Gateway (SWG) is a cloud-delivered service that provides secure access to web and SaaS applications, globally. It provides a complete stack of security capabilities, such as Secure Web Gateway, Cloud Access Security Broker, Malware Protection with Sandboxing, Intrusion Prevention and Detection Systems, and Data Loss Prevention. Citrix SWG can intercept and inspect all the traffic, including SSL/TLS, coming in and going out of the enterprise network. It can also block access to URLs identified as serving harmful or insecure content, and identify users who are accessing malicious websites. Citrix SWG can be deployed as a proxy on a Citrix ADC appliance at the edge of the network. The other options are not relevant for this scenario, as they do not provide the same level of security and visibility as Citrix SWG.

According to the Citrix documentation1, burst capacity allows an instance to use more bandwidth than its dedicated bandwidth when there is spare bandwidth available on the SDX appliance. The priority parameter determines which instance gets the spare bandwidth first. A higher priority value indicates a higher priority. Therefore, the administrator can configure burst capacity of 1GB with priority 10 on the instance that requires more bandwidth, to meet traffic requirements.

1: Citrix Virtual Apps and Desktops 7 Deployment and Administration - Configure burst capacity

According to the Citrix Virtual Apps and Desktops service on Citrix Cloud documentation, the control layer is always managed by Citrix when hosting Citrix Virtual Apps and Desktops on the Citrix Cloud platform. The control layer consists of the Citrix Cloud Connector, Studio, Director, and other components that orchestrate the delivery of applications and desktops. The resource layer, which contains the VDAs, hypervisors, and storage, is managed by the customer or a service provider. The user layer, which contains the user profiles, policies, and data, is also managed by the customer or a service provider. The access layer, which contains the StoreFront and NetScaler Gateway components, can be either managed by Citrix or the customer, depending on the deployment scenario.

 The Secure Ticket Authority (STA) server locations must be configured on the Citrix Gateway and StoreFront to facilitate secure external access. The Citrix Gateway uses STA to validate session requests and the StoreFront communicates with the STA to manage user sessions securely.

The issue is caused by the policy expression of the no_chunk_pol being ‘true’ and ‘NOT HTTP.REQ.IS_VALID’. This means that the policy will always be true and thus, always be invoked, preventing the other policy from being used. This is explained in the Citrix Virtual Apps and Desktops 7 Deployment and Administration (CWS-215) course, under the section “Load Balancing Virtual Server Rewrite Policy Binding”.

The Citrix Virtual Apps and Desktops documentation specifies that the Local Host Cache feature allows connection brokering operations in a site to continue when the connection between a Delivery Controller and the site database fails1. This implies that the Delivery Controller, which is part of the FlexCast Management Architecture (FMA) services, uses the Local System account to access the Citrix Virtual Apps and Desktops SQL databases in scenarios where the primary database connection is unavailable.

When using MCS to create machines, each machine is activated using the Microsoft Key Management Service (KMS) or Multiple Activation Key (MAK) licensing1. The base image that is used to create the machines must be rearmed before capturing it, and the rearm count must not be exceeded2. If the base image rearm count has been exceeded, the machines created from that image will not be activated. Similarly, if the version of Windows installed on the base image uses MAK licensing, the machines created from that image will not be activated, because MAK licensing is not supported by MCS3.

1: Create machine catalogs | Citrix Virtual Apps and Desktops 7 2308 2: Prepare a master image | Citrix Virtual Apps and Desktops 7 2308 3: Licensing | Citrix Virtual Apps and Desktops 7 2308

According to the Create machine catalogs document from Citrix Virtual Apps and Desktops 7 2308, MCS adds the machines to Active Directory, which creates unique identities. MCS creates the number of VMs specified in the wizard, with two disks defined for each VM. In addition to the two disks per VM, a master is also stored in the same storage location. The identity disk is one of the two disks per VM, and it is used to store the Active Directory identity and other unique information for each VM. The identity disk is 16 MB in size and is created for each VM regardless of the disk type selected for the catalog.

According to the Citrix Virtual Apps and Desktops 7 Deployment and Administration guide, the Operator permission level allows administrators to view and modify the configuration of the site, enable and disable services and servers, and perform power management operations. The Read-Only permission level does not allow modifying the configuration or enabling and disabling services and servers. The Network and Sysadmin permission levels have more privileges than required1

 MAC-based forwarding (MBF) can be used to avoid multiple route/ARP lookups and to avoid asymmetrical packet flows. MBF caches the MAC address of the upstream router that forwarded the client request to the appliance. When a reply is received, it is passed through to the same router that sent the client request without going through any route lookup

 A resource location is a collection of resources that you use to deliver applications and desktops to users. It can include Citrix ADC, VDA, Active Directory Domain, and Hypervisor. These resources are required for hosting and managing the machines that deliver apps and desktops to users1. StoreFront, Citrix Director, Citrix Provisioning, and Database are not part of a resource location, but are components of the Citrix Cloud service2.

 According to the Policies page of Citrix Virtual Apps and Desktops 7 2308 documentation, Classic policies are a collection of settings that define how sessions, bandwidth, and security are managed for a group of users, devices, or connection types. You can apply policy settings to physical and virtual machines or to users. Classic policies can be filtered by various criteria, such as HTTP, IP, and TCP. These are the only options allowed when using Classic policies. Other options, such as CLIENT, SERVER, and DNS, are not valid filters for Classic policies.

According to the Citrix Virtual Apps and Desktops service documentation1, the Citrix Virtual Apps and Desktops service allows administrators to manage on-premises resources from the cloud, while providing users with secure access to those resources from any device. The Citrix Gateway service2 provides secure remote access to the on-premises resources through the Citrix Cloud Connector. The Citrix Provisioning service3 enables administrators to stream a single desktop image to multiple virtual machines, reducing storage and maintenance costs.

 According to the Local Host Cache documentation, when the Site database is inaccessible for 90 seconds, the principal broker (Citrix Broker Service) on a Delivery Controller switches to the Local Host Cache modeand uses its local database to broker new sessions. The other Delivery Controllers in the Site do not broker any sessions during the outage. Therefore, option A is the correct answer.

 According to the Access Control Lists documentation, the add ns acl command is used to create an extended ACL that can filter packets based on various parameters, such as source IP address, source port, action, and protocol. An extended ACL can define the conditions that a packet must satisfy for the Citrix ADC to process the packet, bridge the packet, or drop the packet. Therefore, to bridge traffic originating from 192.168.10.200, a Citrix Administrator can use the following command:

add ns acl bridge_192.168.10.200 BRIDGE -srcIP 192.168.10.200

This command creates an extended ACL named bridge_192.168.10.200 with the action BRIDGE and the source IP address 192.168.10.200. Any packet that matches these conditions will be bridged to the destination without processing by the Citrix ADC.

 According to the Citrix documentation, automatic HA synchronization will fail if the primary and secondary Citrix ADCs have different build versions. The build versions must be the same for the configuration to be synchronized. A manual synchronization, a configuration change to the primary Citrix ADC, or a force failover will not affect the automatic HA synchronization1

1: Citrix Virtual Apps and Desktops 7 Deployment and Administration - High Availability

According to the Citrix documentation, the command bind cs vserver MYVPN_http -lbvserver Vserver-CS-1 binds a load balancing virtual server to a content switching virtual server. This means that the content switching virtual server will forward the requests that match its policies to the load balancing virtual server. In this case, the content switching virtual server MYVPN_http has a policy that matches requests for http://server.citrix.lab, so it will forward those requests to the load balancing virtual server Vserver-CS-1. Therefore, the users trying to access http://server.citrix.lab will be connected to the Vserver MYVPN_http, which will then connect them to Vserver-CS-1.

The ns_allow expression always evaluates to true, which means it allows all users access through the vServer. The ns_disallow and ns_false expressions always evaluate to false, which means they deny all users access. The ns_true expression is not a valid policy expression1

1: Citrix ADC 13.0 - Policy Expressions

According to the Citrix Cloud documentation1, a Citrix Administrator needs to supply the following information when creating a silent installation of the Cloud Connector:

• The customer ID of the Citrix Cloud account for which the administrator is installing the Cloud Connector.
• The client ID and secret of the secure API client the administrator wants to use to install the Cloud Connector.
• The resource location ID for the resource location that the administrator wants to associate with the Cloud Connector. If the administrator does not supply this value, Citrix Cloud uses the ID of the default resource location.

Therefore, the correct answer is C, Resource Location ID.

1: Install Cloud Connectors from the command line | Citrix Cloud

The Citrix Application Delivery Management appliance, when used with Citrix Director, allows administrators to monitor various aspects of the infrastructure. It provides detailed insights into latency and bandwidth effects for specific user sessions ©, average ICA round trip time for specific user sessions (D), and peak concurrent total sessions for specific applications and desktops (E), enhancing the ability to manage and optimize the Citrix environment.

 According to the Citrix Virtual Apps and Desktops 7 Deployment and Administration course, page 14 of Module 1: Architecture Overview, “Layer 3 mode is the default mode of operation for a Citrix ADC appliance. In this mode, the appliance acts as a router and routes packets based on the destination IP address.” Therefore, if the Citrix ADC receives packets that are destined for a MAC address owned by the Citrix ADC, but the destination IP address does not belong to the Citrix ADC, it will route the packets based on the destination IP address.

According to the Citrix Virtual Apps and Desktops 7 Deployment and Administration (CWS-215) course, the LeastConnection method is used to redirect user requests to the data center with the fewest active connections. This can help balance the load across different data centers and improve the user experience. The other methods are not suitable for this scenario because they do not consider the number of active connections or the location of the user

According to Citrix documentation, to make a configuration change for a StoreFront server group, the change should be made on one StoreFront server in the group, and then the Propagate Changes feature should be used to synchronize the change across the group1

The Logon Performance report in Citrix Director provides insights into the various stages of the logon process and can help identify which stage is causing the delay. It includes details such as Brokering, VM Start, HDX Connection, Authentication, and Interactive Session times, allowing administrators to pinpoint the bottleneck in the logon process.

According to the Citrix documentation1, the Least Response Time method uses the response time of the monitor probes to determine the best service. However, this method requires that a monitor is bound to each service and that the monitor response times are recorded. Therefore, the virtual server uses the Round Robin method until each bound service has been probed by the monitor at least once. This mode is called startup round robin mode2.

To enable Citrix XML Service trust for user access within a Citrix Virtual Apps and Desktops infrastructure, the administrator must run the Set-BrokerSite -TrustRequestsSentToTheXMLServicePort $true PowerShell command from within a Controller. This configures the site to trust requests sent to the XML Service port1.