20+ practice questions focused on Ensure solution and operations reliability — one of the most tested topics on the Google Professional Cloud Architect exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Ensure solution and operations reliability PracticeA company runs a critical application on Compute Engine instances in a managed instance group (MIG) with autoscaling. During a traffic spike, some instances become unhealthy but are not automatically replaced. What is the most likely cause?
Explanation: The most likely cause is that the autohealing health check is misconfigured. In a managed instance group, autohealing relies on a health check to detect unhealthy instances and trigger replacement. If the health check is misconfigured (e.g., wrong port, path, or protocol), the MIG will not recognize instances as unhealthy and will not automatically replace them, even during a traffic spike.
A company is designing a disaster recovery plan for a Cloud SQL for PostgreSQL instance. They want to failover to a different region with minimal data loss and recovery time under 10 minutes. The database is 500 GB and experiences 2,000 write transactions per second. Which solution should they use?
Explanation: Cloud SQL for PostgreSQL offers a managed cross-region replication feature that creates a replica instance in a different region, using synchronous or asynchronous replication to keep data nearly in sync. This solution meets the RPO (minimal data loss) and RTO (under 10 minutes) requirements because the replica is continuously updated and can be promoted to primary in minutes, without needing to restore from a backup or export.
A company uses Cloud Spanner for a global financial application. They experience increased latency and transaction aborts during peak hours. Which measure should they take first to improve reliability?
Explanation: Option C is correct because transaction aborts and latency in Cloud Spanner are most commonly caused by lock contention during peak hours. By optimizing transactions—such as reducing their scope, using read-only transactions where possible, and avoiding hot-spot writes—you directly address the root cause of contention without incurring additional cost or schema changes. This aligns with Google's best practices for Spanner reliability.
A company deploys a microservices application on Google Kubernetes Engine (GKE). Pods in one deployment are frequently OOMKilled. The team sets memory requests and limits, but pods still crash. What is the most likely remaining cause?
Explanation: Option D is correct because OOMKilled errors occur when a container exceeds its memory limit. Setting memory requests and limits prevents unbounded usage, but if the application has a memory leak, it will continue to consume memory until it hits the configured limit, causing the kernel's Out-Of-Memory (OOM) killer to terminate the pod. The fact that pods still crash after setting limits indicates the application itself is the root cause, not resource configuration.
An organization uses Cloud Functions (2nd gen) for event-driven processing. They notice that some functions fail with 'memory limit exceeded' errors during peak load. The function processes messages from Pub/Sub and writes to Firestore. What should they do to improve reliability without sacrificing throughput?
Explanation: The 'memory limit exceeded' error indicates that the function's allocated memory is insufficient for the workload during peak load. Increasing the memory allocation (Option B) directly resolves this by providing more RAM for processing larger messages or concurrent operations, without altering the invocation pattern or throughput. Cloud Functions (2nd gen) allow memory to be set up to 32 GiB, and this change does not reduce the number of events processed per second.
+15 more Ensure solution and operations reliability questions available
Practice all Ensure solution and operations reliability questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Ensure solution and operations reliability. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Ensure solution and operations reliability questions on the PCA frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Ensure solution and operations reliability is tested as part of the Google Professional Cloud Architect blueprint. Practicing with targeted Ensure solution and operations reliability questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Ensure solution and operations reliability is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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