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질문 # 70
A company must retain all Amazon S3 objects for 90 days for compliance reasons. Additionally, the company must retain all changes to objects for 90 days. Therefore, the company enables S3 Versioning on the bucket. The company does not delete S3 objects even after the retention period ends. The company notices that S3 costs are increasing. The company wants to reduce storage costs. Which solution will meet these requirements with the LEAST operational overhead?
정답：A
설명：
Because S3 Versioning is enabled, each object update creates additional object versions. If old versions are never removed, storage costs keep increasing even when only the latest version is needed operationally. The lowest-overhead solution is to configure an S3 Lifecycle rule to expire noncurrent object versions after the required 90-day compliance retention period. This preserves object changes for the required window and then automatically removes older versions to reduce cost. Option A is not ideal because creating delete markers affects current object visibility and does not clean up old noncurrent versions efficiently. Option C adds unnecessary backup complexity. Option D creates excessive event scheduling and Lambda management overhead.
S3 Lifecycle is the native cost-optimization control for versioned-object retention.
질문 # 71
A company has an application that processes events sequentially by using an Amazon SQS FIFO queue. The company needs a solution that automatically sends notifications to the SQS queue when new objects are uploaded to an Amazon S3 bucket. The solution must maintain message ordering.
Which solution will meet these requirements with the LEAST operational overhead?
정답：B
설명：
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.
질문 # 72
A global company runs a critical primary workload in the us-east-1 Region. The company wants to ensure business continuity with minimal downtime in case of a workload failure. The company wants to replicate the workload to a second AWS Region.
A CloudOps engineer needs a solution that achieves a recovery time objective (RTO) of less than
10 minutes and a zero recovery point objective (RPO) to meet service level agreements.
Which solution will meet these requirements?
정답：A
설명：
The active-active multi-Region architecture provides the lowest possible RTO and RPO among all disaster recovery strategies. In this approach, workloads are deployed and actively running in multiple AWS Regions simultaneously. All data is continuously replicated in real time between Regions using fully managed replication services, ensuring zero data loss (zero RPO).
Because both Regions are active and capable of handling requests, failover between them is instantaneous, meeting the RTO of less than 10 minutes. Amazon Route 53 is used with weighted or latency-based routing policies and health checks to automatically route traffic away from an impaired Region to the healthy Region without manual intervention.
Pilot Light Architecture maintains only a minimal copy of the environment in the secondary Region. It requires time to scale up infrastructure during a disaster, resulting in longer RTO and potential data loss (non-zero RPO).
Warm Standby Architecture keeps partially running infrastructure in the secondary Region.
Although faster than pilot light, it still requires scaling and synchronization, resulting in higher RTO and RPO compared to active-active.
Backup and Restore (option D) relies on periodic backups and restores data when needed. This approach has the highest RTO and RPO, unsuitable for mission-critical workloads demanding high availability and zero data loss.
Therefore, based on AWS-recommended disaster recovery strategies outlined in the AWS Cloud Operations and Disaster Recovery Guide, the Active-Active Multi-Region architecture (Option C) is the only approach that guarantees RTO <10 minutes and RPO = 0, achieving continuous availability and business continuity across Regions.
질문 # 73
A company's application is hosted by an internet provider at app.example.com. The company wants to access the application by using www.company.com, which the company owns and manages with Amazon Route 53.
Which Route 53 record should be created to address this requirement?
정답：A
설명：
Comprehensive Explanation (250-350 words):
When mapping one domain name to another domain name that is hosted outside AWS, a CNAME record is the correct DNS record type. CNAME records map an alias name (www.company.com) to a canonical domain name (app.example.com).
Alias records cannot be used to point to non-AWS resources. A and PTR records map IP addresses, not domain names, and are therefore not appropriate.
Because www.company.com is not the zone apex, a CNAME record is valid and supported. This solution requires no additional infrastructure and is the standard DNS approach for this scenario.
질문 # 74
A compliance team requires all administrator passwords for Amazon RDS DB instances to be changed at least annually. Which solution meets this requirement in the MOST operationally efficient manner?
정답：C
설명：
AWS Secrets Manager can securely store RDS administrator credentials and automatically rotate them on a defined schedule. Configuring rotation every 365 days satisfies the annual password- change requirement with minimal ongoing administrative effort.
질문 # 75
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