1Y0-312 Performance and Scalability Optimization Practice Test 2 — 15 Questions

Question 1

Which TWO of the following settings should be optimized to improve the performance of a high-latency connection in a Citrix environment? (Choose TWO)

Accepted Answer

Enable 'Optimize for high-latency connections'.. In high-latency scenarios, the primary goal is to reduce the number of round-trips between the client and the server. By adjusting the 'Optimize for high-latency' policy and enabling 'EDT', the administrator can maintain a responsive session. These settings directly address the protocol's susceptibility to latency, ensuring that keyboard and mouse input remain smooth even when the physical distance or network quality is not ideal.

Answer

Disable 'Hardware encoding'.

Answer

Increase the 'Maximum allowed bandwidth' limit.

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Set 'Visual quality' to 'Always Lossless'.

Question 2

An administrator notices high CPU utilization on VDA machines during login storms. Which Citrix policy setting should be configured to reduce resource consumption during the initial user session establishment?

Accepted Answer

Limit the 'Maximum number of frames per second'.. Reducing the number of concurrent active graphics processing tasks during the login phase minimizes the CPU spike. By limiting the 'Maximum number of frames per second' or disabling 'Optimize for 3D graphics' for non-essential users, administrators can flatten the resource utilization curve. This is vital for maintaining a stable VDI environment, as uncontrolled login storms can trigger false-positive performance alerts and degrade the user experience for already connected sessions.

Answer

Enable 'Legacy Graphics Mode'.

Answer

Set 'Desktop Composition' to disabled.

Answer

Enable 'Build to lossless' policy.

Question 3

Refer to the exhibit. An administrator is investigating intermittent performance latency for a remote user. The CLI output shows the session is using 'Thinwire' and the 'LastConnectionFailureReason' is null. What is the next logical step to optimize this user's perceived latency?

Accepted Answer

Verify 'HDX Adaptive Transport' is set to 'Preferred'.. When connection failures are absent but latency persists, the issue often stems from network throughput or protocol optimization. Checking the HDX Adaptive Transport status ensures the session is utilizing EDT (Enlightened Data Transport) over UDP rather than falling back to TCP. Optimizing these transport settings is critical for performance in geographically distributed environments where packet loss or high jitter can significantly degrade the responsiveness of the ICA virtual channel.

Answer

Increase the 'Maximum allowed bandwidth' in policies.

Answer

Disable 'Hardware Encoding' on the VDA.

Answer

Reinstall the Citrix VDA software.

Question 4

Which TWO actions should an administrator take to improve the scalability of a non-persistent VDI environment when using Machine Creation Services (MCS)?

Accepted Answer

Enable 'RAM cache with overflow to disk' for temporary data.. Managing storage and disk operations is the key to scaling MCS environments. By using RAM cache for temporary data, the IOPS load on the underlying storage array is drastically reduced. Furthermore, offloading the paging file to the RAM disk further minimizes write-heavy operations, allowing for higher density per host. These strategies are essential for maintaining acceptable performance levels when scaling to large user groups on shared storage architectures.

Answer

Increase the size of the Master Image virtual disk.

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Disable the Windows Event Log service.

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Assign a dedicated GPU to every virtual desktop.

Question 5

Refer to the exhibit. Users report that text appears 'blurry' when scrolling through documents. Which change to the policy would best resolve this while maintaining performance?

Accepted Answer

Enable 'Build to Lossless'.. The 'Blurry' effect during scrolling is often caused by aggressive compression settings or 'Build to Lossless' being disabled. When 'Build to Lossless' is off, the image remains compressed during movement to maintain high frame rates. Enabling this feature allows the VDA to render the image in full fidelity once movement stops. This provides a balance between smooth scrolling performance and clear text readability for end users.

Answer

Change Display Quality to 'Low'.

Answer

Disable 'Hardware Encoding'.

Answer

Increase Target Frame Rate to 60.

Question 6

A Citrix administrator is troubleshooting user sessions that experience choppy audio and sluggish screen redraws when branch-office employees connect to published desktops over a 1.5 Mbps WAN link. The administrator confirms that the VDA hosts have ample CPU and memory headroom and that the network link is not saturated. Which action should the administrator take to improve the user experience for these sessions without upgrading the WAN circuit?

Accepted Answer

Enable the Adaptive Transport policy and set it to Preferred in the HDX policy for the Delivery Group.. Adaptive Transport over EDT gives ICA a UDP-based path with congestion control and forward error correction, which is purpose-built for lossy, high-latency WAN links like the 1.5 Mbps branch circuit in this scenario. Because the VDA hosts are not resource-constrained, the fix belongs at the transport layer. Setting Adaptive Transport to Preferred lets sessions use EDT when possible and gracefully fall back to TCP, improving both audio smoothness and screen responsiveness without additional bandwidth.

Answer

Disable the Use Video Codec for Compression policy so that all graphics are encoded with Thinwire instead of H.264.

Answer

Configure the Audio quality policy to Low and apply it to the Delivery Group so that audio uses less bandwidth.

Answer

Increase the Maximum Offscreen Buffers value to 100 in the HDX MediaStream policy for the Delivery Group.

Question 7

An administrator manages a Citrix Virtual Apps and Desktops 7 site with 4000 concurrent users across three resource locations. Users in one location report that published application launches take over 30 seconds, while the same applications launch in under 6 seconds in the other two locations. The administrator confirms that the VDA hosts in the affected location are healthy and that the StoreFront servers are load balanced. Network latency between the affected location and the site database is under 2 ms. Which cause should the administrator investigate first?

Accepted Answer

The Delivery Controllers in the affected resource location are not configured as a zone with a preferred Controller, so VDA registrations are crossing the WAN to a remote Controller.. Citrix zones let you designate a preferred Delivery Controller for each resource location so that VDA registration and brokering stay on the local network. When no preferred Controller is set or VDAs register to a Controller in another zone, every application enumeration and launch crosses the WAN, multiplying latency. The location-specific symptom, combined with healthy VDAs and low database latency, points to remote brokering rather than a site-wide problem.

Answer

The StoreFront server group is missing the XML service DNS entries for the affected location, so users are redirected to a remote StoreFront.

Answer

The VDA hosts in the affected location are using the Machine Creation Services personal vDisk technology, which adds I/O latency during application launch.

Answer

The affected resource location has no local Citrix Cloud Connector registered, forcing brokering traffic across the WAN.

Question 8

An administrator manages a Delivery Group of 120 single-session Windows 10 VDAs. During the morning peak, logon times exceed four minutes and the hosting cluster datastore latency climbs above 30 ms. The administrator wants to reduce the read I/O generated by the Machine Creation Services (MCS) provisioned VDAs without changing the master image. Which action best accomplishes this?

Accepted Answer

Enable Machine Creation Services I/O write cache, then place the cache disk on a dedicated high-IOPS datastore.. MCS I/O write cache stores writes locally on a per-VM cache disk, preventing them from being written back to the shared base disk during boot and logon. This reduces contention and latency on the shared datastore without touching the master image, which is the constraint set by the administrator. It is the supported MCS-layer mechanism for exactly this type of I/O storm.

Answer

Enable Citrix App Layering to separate the OS layer from the application layer for the existing catalog.

Answer

Configure the Delivery Group to use Random selection for session host assignment.

Answer

Configure Citrix Provisioning (PVS) vDisk caching in cache on device hard disk mode for the existing MCS catalog.

Question 9

An administrator is optimizing a Citrix Virtual Apps and Desktops 7 environment for scalability. The environment uses Machine Creation Services (MCS) with a shared storage array. The administrator wants to reduce the storage I/O load generated when multiple non-persistent VDAs are started simultaneously during the morning boot storm. Which MCS feature should the administrator enable to cache the master image on each host and serve read requests locally?

Accepted Answer

MCS vDisk caching. MCS vDisk caching caches the master image on each host, serving read requests locally and reducing shared storage I/O during boot storms. This improves scalability by distributing the read load. Other options are either from PVS or not actual features. The administrator should enable vDisk caching to mitigate storage contention.

Answer

MCS local caching

Answer

Citrix Provisioning (PVS) write cache in RAM

Answer

MCS I/O write cache

Question 10

An administrator is deploying Citrix Virtual Apps and Desktops 7 in a large environment. Users report that the logon process is slow, and the administrator suspects that the Citrix Profile Management service is not scaling well. Which configuration change should the administrator make to improve profile load times?

Accepted Answer

Enable the 'Profile streaming' policy and set it to 'Enabled'.. Profile streaming reduces logon time by fetching profile files on demand instead of copying the entire profile upfront. This is especially beneficial for large profiles and high-latency connections. The other options either affect logoff performance, add overhead, or do not directly address logon speed.

Answer

Set the 'Profile container' policy to use a VHDX file.

Answer

Increase the 'Number of retries' for profile load to 5.

Answer

Configure the 'Active write back' policy to 'Enabled'.

Question 11

A Citrix administrator is troubleshooting a site where users on Provisioning Services (PVS) streamed VDAs experience intermittent slow logons and occasional session freezes during peak hours. The PVS servers show heavy write cache activity on the vDisk store, and network utilization on the streaming NICs is consistently above 80 percent. Which action should the administrator take first to improve performance and scalability without redesigning the environment?

Accepted Answer

Configure and tune Provisioning Services write cache on the PVS servers to reduce I/O to the vDisk store.. The heavy write cache activity on the vDisk store indicates that write operations are saturating the storage layer. Tuning PVS write cache on the servers allows writes to be absorbed in RAM or local disk, reducing store I/O and improving logon and session performance. This directly targets the bottleneck without requiring a redesign of the PVS infrastructure.

Answer

Enable write cache on the PVS vDisk and redirect it to the VDA's local disk.

Answer

Increase the number of PVS streaming NICs on each target device by adding a second network adapter.

Answer

Switch the vDisk from standard image mode to private image mode for all target devices.

Question 12

A Citrix administrator is implementing Citrix Workspace Environment Management (WEM) to improve logon performance in a large environment. Users report that first-time logons are slow, but subsequent logons are fast. Which WEM feature should the administrator configure to address the first-time logon delay?

Accepted Answer

Enable WEM agent cache synchronization with the infrastructure server.. WEM agent cache synchronization writes the user's assigned actions, settings, and policies to a local cache on the VDA so that first logons do not require real-time queries to the WEM infrastructure server. This reduces first-logon processing time while preserving the fast subsequent logons that already benefit from cached data. It is the WEM feature specifically designed for this first-logon versus subsequent-logon pattern.

Answer

Configure WEM to enforce mandatory profiles for all users in the Delivery Group.

Answer

Enable WEM's Citrix Profile Management integration to synchronize profiles at logoff.

Answer

Configure WEM to apply a CPU spike protection policy during logon.

Question 13

An administrator is designing a Citrix Virtual Apps and Desktops 7 solution for a large call center with 500 concurrent users. The administrator needs to ensure that the logon process is as efficient as possible and that profile data is not a bottleneck. The organization uses Microsoft roaming profiles with folder redirection. Which Citrix profile management feature should the administrator implement to improve logon performance by streaming profile data on demand?

Accepted Answer

Profile streaming. Profile streaming in Citrix Profile Management streams profile files on demand, reducing logon times by not copying the entire profile at logon. This is particularly beneficial for large profiles and high-concurrency environments. Other options do not provide on-demand streaming. Enabling profile streaming improves logon performance and scalability.

Answer

Active write back

Answer

Folder redirection

Answer

Citrix Profile Management streamed profiles

Question 14

An administrator is troubleshooting performance issues in a Citrix Virtual Apps and Desktops 7 environment. Users on a specific Delivery Group report that applications launch slowly, and the administrator notices high CPU usage on the VDA hosts. After analysis, the administrator determines that a custom application is causing excessive CPU spikes. Which Citrix feature should the administrator use to limit the CPU usage of this application?

Accepted Answer

CPU limit in Studio. The CPU limit feature in Citrix Studio allows administrators to set a hard cap on CPU usage for a published application. This is ideal for containing resource-intensive applications that cause spikes, ensuring they do not degrade performance for other users. The other options either set minimums or influence scheduling without enforcing a limit.

Answer

CPU priority in Studio

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CPU affinity in Studio

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CPU reservations in Studio

Question 15

A Citrix administrator manages a Delivery Group of 40 Windows Server 2019 VDAs hosting published desktops. During peak morning logons, users report that sessions take over 90 seconds to reach the desktop, and vSphere performance charts show sustained high write latency on the shared datastore hosting the vDisk files. The administrator wants to reduce the write I/O generated during the logon storm without changing the master image or user profiles. What should the administrator configure?

Accepted Answer

Enable Citrix Provisioning cache in RAM with overflow to disk on each VDA.. The bottleneck is write I/O on the shared datastore during the logon storm, so the fix must absorb or redirect those writes. Redirecting the Provisioning Services write cache to RAM with overflow to disk keeps the high-volume logon writes in local memory, only flushing to disk when the cache fills, which reduces datastore contention and shortens session launch times without touching the master image or profiles.

Answer

Increase the Provisioning Services database size and reindex the SQL instance.

Answer

Configure the VDA to use a persistent write-back cache on the shared datastore.

Answer

Enable Citrix Profile Management folder redirection for the Documents folder.