Get Amazon SOA-C03 Exam Practice Questions - Real and Updated

Answer : C

Comprehensive and Detailed Explanation From Exact Extract of AWS CloudOps Documents:

The correct answer is C because selective CloudFront invalidation ensures that only updated JavaScript files are refreshed across edge locations. AWS CloudOps documentation explains that invalidations remove cached objects so that CloudFront fetches the latest version from the origin on the next request.

Invalidating only changed files minimizes cost, reduces operational impact, and avoids unnecessary origin requests. This approach ensures users always receive the latest application assets without degrading backend performance.

Option A is incorrect because setting TTLs to 0 forces CloudFront to query the origin for every request, increasing load on the ALB and EC2 instances. Option B is inefficient and costly because invalidating all files is unnecessary. Option D removes the benefits of CloudFront caching and increases latency.

AWS CloudOps best practices recommend targeted invalidations during deployments to balance performance, cost, and correctness.

Amazon CloudFront Developer Guide -- Cache Invalidation

AWS SysOps Administrator Study Guide -- Content Delivery

AWS Well-Architected Framework -- Performance Efficiency and Reliability

Answer : B

Blue/green deployment with AWS CodeDeploy is the correct strategy for Amazon ECS when zero downtime and fast rollback are required. In a blue/green deployment, the current production task set remains active while a new task set is created and validated. Traffic can then be shifted safely to the new version. If the new version causes performance degradation, CodeDeploy can roll back by redirecting traffic to the previous task set. AWS ECS documentation describes blue/green deployment as a method that reduces downtime and risk by running two production environments and validating revisions before routing production traffic. Rolling updates do not provide the same immediate one-step rollback. Canary or linear traffic shifting gradually moves traffic but does not match the requirement for immediate rollback as directly as blue/green. Manual scaling is operationally weak.

Answer : D

Comprehensive and Detailed Explanation From Exact Extract of AWS CloudOps Documents:

The correct answer is D because Amazon S3 Express One Zone with directory buckets and zonal endpoints is specifically designed for single--Availability Zone, high-performance workloads such as HPC, machine learning, and analytics applications running on Amazon EC2. AWS CloudOps documentation states that S3 Express One Zone delivers single-digit millisecond latency and up to 10x higher request performance compared to general purpose S3 buckets when data is accessed from the same Availability Zone.

An S3 directory bucket is required to use the S3 Express One Zone storage class. These buckets are explicitly associated with a single Availability Zone and use zonal endpoints, which eliminate cross-AZ network hops and significantly reduce latency. Importing the data from the existing general purpose bucket ensures compatibility while achieving maximum throughput and lowest latency.

Option A is incorrect because S3 Transfer Acceleration is optimized for long-distance, internet-based transfers, not for in-Region HPC workloads. Option B is incorrect because lifecycle policies cannot move objects into S3 Express One Zone, and S3 Express One Zone does not use Regional endpoints. Option C is incorrect because general purpose buckets do not support zonal endpoints and therefore cannot achieve the same performance benefits.

AWS CloudOps performance optimization guidance clearly identifies S3 directory buckets with S3 Express One Zone and zonal endpoints as the optimal architecture for high-throughput, low-latency workloads in a single Availability Zone.

Amazon S3 User Guide -- S3 Express One Zone and Directory Buckets

AWS SysOps Administrator Study Guide -- Storage Performance Optimization

AWS Well-Architected Framework -- Performance Efficiency Pillar

Answer : D

AWS Backup is the most operationally efficient solution for scheduled, long-term retention of RDS backups. It can define backup plans with schedules, retention periods, backup vaults, and lifecycle controls. A 12-hour backup frequency and 5-year retention policy are straightforward to manage through AWS Backup. RDS automated backups are useful for point-in-time recovery, but they do not support a 5-year retention period; their retention window is limited. EventBridge or Lambda snapshot automation could create snapshots, but would require custom logic for retention, monitoring, failures, and compliance evidence. Copying snapshots to S3 manually is not the normal RDS backup workflow. Therefore, AWS Backup provides the managed backup policy framework required for long retention and low operational overhead.

Answer : C

The intended ordered-delivery architecture is to use a FIFO-capable intermediary and then deliver messages to the SQS FIFO queue. Amazon SNS FIFO topics support ordered message delivery to subscribed SQS FIFO queues. However, be careful: AWS documentation states that Amazon S3 event notifications are not directly compatible with SQS FIFO queues, and S3 native event notifications allow standard SNS destinations, not SNS FIFO destinations. So the cleanest real-world architecture would normally use Amazon EventBridge or Lambda to publish into a FIFO path with an appropriate MessageGroupId. From the provided choices, C is the best conceptual answer because it is the only option that preserves FIFO semantics through SNS FIFO to SQS FIFO. Option B is explicitly invalid for S3-to-SQS FIFO direct delivery. Option A is operationally heavy and unreliable for event detection.