DVA-C02 Troubleshooting and Optimization Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  S3 Standard: Designed for frequently accessed data with low latency and high throughput.

  Why this is correct

  S3 Standard is the default storage class optimized for frequently accessed data, offering low latency and high throughput for active workloads. It stores data redundantly across multiple Availability Zones (AZs) within a region, providing 99.99% availability and 99.999999999% durability. This class suits dynamic content, big data analytics, and mobile applications where retrieval consistency and speed are critical.

• ✗

  S3 Standard: Infrequent access data stored in a single Availability Zone.

  Why it's wrong here

  This description actually defines S3 One Zone-IA, not S3 Standard. S3 Standard replicates data across at least three AZs in a region, so it never stores data in a single AZ. One Zone-IA is the infrequent-access class that stores data in only one AZ, making it cheaper but less resilient to AZ loss.

• ✓

  S3 Intelligent-Tiering: Automatically moves data between access tiers to optimize costs.

  Why this is correct

  S3 Intelligent-Tiering is the only storage class that automatically monitors access patterns and shifts objects between frequent, infrequent, and optional archive-access tiers without retrieval fees or lifecycle rules. It charges a small monthly monitoring/automation fee per object but no retrieval charge when data moves between active tiers. Cost optimization happens because you benefit from lower storage costs for long-lived, unpredictable workloads without sacrificing performance.

• ✓

  S3 Glacier Instant Retrieval: Archive storage with milliseconds retrieval time.

  Why this is correct

  S3 Glacier Instant Retrieval is designed for archive data that still requires millisecond access, such as medical images or active archival footage. It offers the lowest storage cost among archive classes with immediate retrieval, storing data redundantly across multiple AZs. This contrasts with Glacier Flexible or Deep Archive, which trade retrieval time (minutes to hours) for even lower storage price.

• ✓

  S3 One Zone-IA: Infrequent access data stored in a single Availability Zone.

  Why this is correct

  S3 One Zone-IA is intended for infrequently accessed data that can be recreated if the AZ fails, storing it in only a single Availability Zone. It delivers the same durable 99.999999999% object-level durability as other classes but with 99.5% availability and no multi-AZ resilience. Common use cases include secondary backup copies, on-premises data replication, or scratch data where cost savings outweigh the need for high availability.

• ✗

  S3 Intelligent-Tiering: Archive storage with retrieval times of minutes.

  Why it's wrong here

  This description applies to S3 Glacier Flexible Retrieval, which retrieves data within minutes, not Intelligent-Tiering. Intelligent-Tiering is a real-time access-class optimiser that keeps data in S3-standard-like high performance, with retrieval times in milliseconds. Glacier Flexible is a true archive class that uses longer retrieval processes (minutes to hours) in exchange for lower storage costs.

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