Task 1: Develop Code for Applications Hosted on AWS DVA-C02 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   What is a common implication of a stateful component in a distributed system?

   • AIt eliminates the need for external databases.
   • BIt is more resilient to instance failures because state is replicated automatically.
   • CIt can be scaled out easily by adding more instances behind a load balancer.
   • DIt may require session affinity or centralized state storage to maintain consistency.
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2. 12expert · hard

   A developer is building a data pipeline that ingests streaming data from a fleet of sensors. The data is sent to Amazon Kinesis Data Streams. A downstream application needs to aggregate data per sensor over a 5-minute window. The developer is considering using the Kinesis Client Library (KCL) to build the consumer. The developer wants to ensure that all data for a specific sensor is processed by the same consumer instance to maintain correct aggregation. What should the developer do?

   • AUse a random partition key to distribute records evenly across shards.
   • BUse Kinesis Data Firehose to buffer the data and deliver it to S3.
   • CUse the sensor ID as the partition key when putting records into the Kinesis stream.
   • DConfigure the KCL to use a custom shard assignment strategy.
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4. 13application · medium

   A developer is building a real-time analytics application that ingests millions of events per day from IoT devices. The events must be processed in near real-time, and the processing must be able to handle duplicate events that may occur due to device retries. The developer plans to use Amazon Kinesis Data Streams for ingestion. How should the developer design the consumer application to handle this?

   • AConfigure the Kinesis stream to discard duplicate records based on a partition key.
   • BMake the consumer application idempotent by using a unique event ID to check for duplicates in the destination store before processing.
   • CUse the Kinesis Producer Library (KPL) to deduplicate events before they are put into the stream.
   • DUse the Kinesis Client Library (KCL) with a custom checkpointing strategy that skips duplicate records.
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5. 14foundation · easy

   Which architectural pattern is characterized by a single deployable unit that contains all application components and typically scales as a whole?

   • AEvent-driven
   • BMonolithic
   • CMicroservices
   • DChoreography
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6. 15foundation · easy

   Which tool is commonly used to run unit tests for AWS Lambda functions developed with AWS SAM?

   • Apytest
   • BAWS CloudFormation
   • CAmazon CloudWatch
   • DAWS CodeDeploy
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