1Y0-312 Advanced Troubleshooting Practice Question
A Citrix Virtual Apps and Desktops 7 administrator is troubleshooting a Delivery Controller that intermittently fails to broker sessions, with users receiving 'No machines available' errors even though the Delivery Group shows available machines. The administrator notices the issue occurs during peak hours and resolves after a few minutes. Which action should the administrator take to identify the cause?
⚠ Common exam trap
The trap here is assuming that 'No machines available' always means VDAs are unregistered, when under load it can instead reflect broker or database timeouts that prevent machine enumeration even though machines are healthy.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review the Citrix Broker Service logs and the site database performance counters during peak hours.
Intermittent brokering failures that correlate with peak hours and resolve quickly suggest a performance or contention issue in the brokering path, often involving the site database or the Broker Service itself. Reviewing Broker Service logs alongside database performance counters during peak load provides the evidence needed to pinpoint slow queries, timeouts, or throttling, which is the correct diagnostic action.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the number of Delivery Controllers in the site and enable load balancing.
Why it's wrong here
Adding controllers may improve capacity, but it does not diagnose the intermittent brokering failure and could mask an underlying issue such as database contention or service throttling. The task is to identify the cause, not to scale out. Without evidence, adding controllers is a speculative change that may not resolve the peak-hour 'No machines available' errors.
- ✓
Review the Citrix Broker Service logs and the site database performance counters during peak hours.
Why this is correct
The Broker Service logs record brokering decisions and errors, while database performance counters reveal contention or slow queries during peak load. Together they can show whether the controller is timing out on database calls or failing to enumerate machines despite the Delivery Group reporting availability. This directly targets the intermittent, load-correlated nature of the failure.
- ✗
Check the VDA's registration status and restart the Citrix Desktop Service on all machines.
Why it's wrong here
The Delivery Group already shows available machines, so registration is not the problem. Restarting the Desktop Service on all VDAs is a broad action that would disrupt users and does not address why brokering intermittently fails under load. The evidence points to the controller or database layer, not to VDA registration, making this an ineffective diagnostic step.
- ✗
Recreate the Delivery Group and re-add the machines to refresh the broker's machine cache.
Why it's wrong here
Recreating the Delivery Group is a disruptive remediation that would not explain an intermittent, time-correlated failure and could cause widespread user impact. It does not gather diagnostic evidence about why brokering fails during peak hours. The broker's machine cache is refreshed automatically; the issue is more likely related to service or database performance under load.
Visual reference
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Citrix exam blueprint
This 1Y0-312 practice question is part of Courseiva's free Citrix certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Y0-312 exam.