A company is running a batch application on Amazon EC2 instances. The application consists of a backend with multiple Amazon RDS databases. The application is causing a high number of reads on the databases. A solutions architect must reduce the number of database reads while ensuring high availability.What should the solutions architect do to meet this requirement?
Answer(s): B
A) Use Amazon ElastiCache for RedisElastiCache Redis provides in-memory caching to reduce read traffic to RDS by serving frequently accessed data from the cache, improving latency and availability through a managed, clustered cache layer. B) ElastiCache for Redis is correct; it supports data structures, persistence options, and high availability with Redis replication and automatic failover. C) Route 53 DNS caching does not reduce database reads or provide a caching layer for database queries. D) ElastiCache Memcached offers caching but Redis generally provides richer data structures and persistence; however, Redis is the recommended option in this scenario for higher availability and features. A) and C) do not meet the requirement.
A company needs to run a critical application on AWS. The company needs to use Amazon EC2 for the application’s database. The database must be highly available and must fail over automatically if a disruptive event occurs.Which solution will meet these requirements?
Answer(s): A
A) Using two EC2s in different Availability Zones with a clustered database and replication provides high availability and automatic failover within a single region, satisfying HA and automatic recovery requirements.B) Single AZ with manual AMI backups and CloudFormation does not provide automatic failover or multi-AZ resilience for database availability.C) Cross-region deployment adds complexity and latency; automatic failover across regions is not native for typical EC2-hosted databases and is not standard HA.D) EC2 automatic recovery applies to the instance, not to application-level failover or database HA; single AZ limits resilience.
A company’s order system sends requests from clients to Amazon EC2 instances. The EC2 instances process the orders and then store the orders in a database on Amazon RDS. Users report that they must reprocess orders when the system fails. The company wants a resilient solution that can process orders automatically if a system outage occurs.What should a solutions architect do to meet these requirements?
Answer(s): C
Moving EC2s into an Auto Scaling group and decoupling processing with SQS enables durable, fault-tolerant reprocessing. Messages persist in SQS until processed, and EC2 instances can scale and continuously poll the queue, ensuring orders are not lost during outages. This supports automatic retries and at-least-once processing.A) EventBridge triggering ECS task is not addressing persistent retry or queueing; adds complexity without guaranteed ordering/reprocessing semantics.B) ALB with direct client routing does not provide durable queueing or automatic reprocessing if instances fail.D) SNS plus Lambda and Run Command introduces tight coupling and operational overhead; not a reliable, scalable reprocessing mechanism for batch order processing.
A company runs an application on a large fleet of Amazon EC2 instances. The application reads and writes entries into an Amazon DynamoDB table. The size of the DynamoDB table continuously grows, but the application needs only data from the last 30 days. The company needs a solution that minimizes cost and development effort.Which solution meets these requirements?
Answer(s): D
D) Using DynamoDB Time To Live (TTL) with a per-item 30-day expiry is the simplest, cost-efficient, and low-development approach. TTL automatically deletes items after the specified timestamp, requiring no ongoing processing or Lambda/EC2 maintenance, and minimizes storage costs for aging data.A) CloudFormation redeploy every 30 days is operationally heavy and unnecessary; it does not automate data expiry.B) EC2-based monitoring with DynamoDB Streams and custom deletion adds unmanaged maintenance, scaling concerns, and cost.C) Lambda-driven deletion still incurs invocation costs and requires continuous event handling; TTL is more straightforward and scalable.
A company has a Microsoft .NET application that runs on an on-premises Windows Server. The application stores data by using an Oracle Database Standard Edition server. The company is planning a migration to AWS and wants to minimize development changes while moving the application. The AWS application environment should be highly available.Which combination of actions should the company take to meet these requirements? (Choose two.)
Answer(s): B,E
Rehosting in Elastic Beanstalk with a Multi-AZ deployment preserves existing .NET app architecture and provides high availability, while migrating the Oracle database to Oracle on RDS (Multi-AZ) minimizes changes and maintains Oracle compatibility. This aligns with minimizing development changes and ensures HA across compute and database layers.A) Refactoring to serverless would require substantial code changes and is not aligned with minimizing changes.C) EC2 with Amazon Linux AMI would require OS/image changes and is not as compatible with a Windows/.NET on-prem setup.D) Migrating to DynamoDB is a redesign and not suitable for the existing Oracle workloads.E) Oracle on RDS in Multi-AZ preserves Oracle features and provides managed HA for the database.
A company runs a containerized application on a Kubernetes cluster in an on-premises data center. The company is using a MongoDB database for data storage. The company wants to migrate some of these environments to AWS, but no code changes or deployment method changes are possible at this time. The company needs a solution that minimizes operational overhead.Which solution meets these requirements?
F) Actually D is correct: EKS with Fargate provides serverless Kubernetes compute, minimizing operational overhead, and Amazon DocumentDB (MongoDB compatibility) offers MongoDB-compatible storage without managing a database engine. This matches no-code/low-ops migration while preserving Kubernetes workloads.A) ECS with EC2 and MongoDB on EC2 requires managing MongoDB and compute capacity, increasing ops.B) ECS with Fargate and DynamoDB changes data storage to a different database, not preserving MongoDB behavior.C) EKS with EC2 and DynamoDB replaces MongoDB with a different store and requires managing nodes, increasing ops.
A telemarketing company is designing its customer call center functionality on AWS. The company needs a solution that provides multiple speaker recognition and generates transcript files. The company wants to query the transcript files to analyze the business patterns. The transcript files must be stored for 7 years for auditing purposes.Which solution will meet these requirements?
Amazon Transcribe supports automatic speech recognition with speaker diarization (multiple speaker recognition) and can produce transcript files that can be stored in S3 and later queried with tools like Athena for analysis. B is correct.A is incorrect because Rekognition is for video/audio face/recognition and not suited for transcription; it does not provide native transcript analysis workflow with Athena. C is incorrect because Translate is for language translation, not transcription or diarization; Redshift is overkill and not suited for transcript analysis workflow. D is incorrect because Textract analyzes text from documents, not audio transcripts; Rekognition alone does not handle transcripts or analytics.
A company hosts its application on AWS. The company uses Amazon Cognito to manage users. When users log in to the application, the application fetches required data from Amazon DynamoDB by using a REST API that is hosted in Amazon API Gateway. The company wants an AWS managed solution that will control access to the REST API to reduce development efforts.Which solution will meet these requirements with the LEAST operational overhead?
The correct answer is D. A Cognito user pool authorizer allows API Gateway to validate JWTs issued by Cognito, providing built-in, managed authentication with no extra Lambda code, aligning with the requirement to minimize operational overhead.A is incorrect because a Lambda authorizer adds custom logic and maintenance; it increases overhead compared to built-in Cognito integration.B is incorrect because API keys are not tied to user authentication and are not intended for per-user access control; this approach is unsuitable for scalable, secure user-level access.C is incorrect because sending emails in headers and validating in Lambda is custom, brittle, and does not leverage managed authentication or token validation.
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