CLF-C02 Cloud Technology and Services Practice Test 14 — 15 Questions

Question 1

A developer wants to run code in response to an S3 object upload without managing any servers. The code runs for less than 5 minutes. Which AWS service is most appropriate?

Accepted Answer

AWS Lambda. AWS Lambda is the most appropriate service because it is a serverless compute service that automatically runs code in response to events, such as an S3 object upload, without requiring any server management. Lambda supports code execution up to 15 minutes per invocation, which easily accommodates the less-than-5-minute requirement, and it integrates natively with S3 event notifications via the S3 bucket notification configuration.

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Amazon EC2

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AWS Fargate

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Amazon ECS

Question 2

Which AWS database service is best suited for storing and querying data with complex relationships using structured query language?

Accepted Answer

Amazon RDS. Amazon RDS is the correct choice because it provides managed relational database services (e.g., MySQL, PostgreSQL, Oracle, SQL Server) that use structured query language (SQL) and are designed to handle complex relationships through foreign keys, joins, and normalized schemas. This makes it ideal for applications requiring ACID transactions and complex queries across multiple tables.

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Amazon DynamoDB

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Amazon ElastiCache

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Amazon Neptune

Question 3

A retail company wants to implement a recommendation engine based on customer purchase history. Which AWS service is designed to provide ML-based personalized recommendations with no ML experience required?

Accepted Answer

Amazon Personalize. Amazon Personalize is a fully managed AWS service that enables developers to build applications with real-time personalized recommendations without requiring any prior machine learning experience. It uses the same technology that powers Amazon.com's recommendation engine, processing customer purchase history to deliver tailored product suggestions.

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Amazon SageMaker

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Amazon Comprehend

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Amazon Rekognition

Question 4

Which AWS service provides managed Elasticsearch (OpenSearch) clusters for log analytics and full-text search?

Accepted Answer

Amazon OpenSearch Service. Amazon OpenSearch Service (successor to Amazon Elasticsearch Service) is the correct choice because it provides managed clusters for Elasticsearch and OpenSearch, enabling log analytics, full-text search, and real-time application monitoring. It integrates with Logstash and Kibana (the ELK stack) and supports the OpenSearch API, making it the direct AWS offering for this use case.

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Amazon CloudSearch

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Amazon Athena

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Amazon Redshift

Question 5

A company needs to transfer petabytes of data from an on-premises data center to Amazon S3. The network connection is too slow for online transfer and the data must arrive within two weeks. Which AWS service is most appropriate?

Accepted Answer

AWS Snowball Edge. AWS Snowball Edge is the most appropriate service because it provides physical storage devices that can be shipped to the on-premises data center, allowing petabyte-scale data to be loaded locally and shipped back to AWS, bypassing slow network connections entirely. This meets the two-week deadline since network transfer would be infeasible at that scale over a slow link.

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AWS DataSync

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AWS Direct Connect

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Amazon S3 Transfer Acceleration

Question 6

Which AWS service allows you to build, train, and deploy machine learning models at scale?

Accepted Answer

Amazon SageMaker. Amazon SageMaker is the correct answer because it is a fully managed service that provides every component needed for the machine learning lifecycle, including building, training, and deploying models at scale. It offers integrated Jupyter notebooks for development, built-in algorithms, automatic model tuning, and one-click deployment to a production endpoint with auto-scaling. This makes it the single AWS service designed specifically for end-to-end ML workflows, unlike the other options which serve narrower AI/ML functions.

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Amazon Rekognition

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Amazon Comprehend

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AWS DeepLens

Question 7

Which AWS service provides a managed graph database for use cases like social networks, recommendation engines, and fraud detection?

Accepted Answer

Amazon Neptune. Amazon Neptune is a fully managed graph database service optimized for storing and querying highly connected datasets. It supports both property graph (using Apache TinkerPop Gremlin) and RDF (using SPARQL) models, making it ideal for use cases like social networks, recommendation engines, and fraud detection that require traversing complex relationships.

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Amazon DynamoDB

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Amazon RDS

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Amazon Redshift

Question 8

A company wants to use machine learning to automatically identify objects, scenes, and activities in images uploaded by users. Which AWS service should they use?

Accepted Answer

Amazon Rekognition. Amazon Rekognition is the correct service because it is specifically designed to analyze images and videos to identify objects, scenes, activities, faces, and text. It provides pre-trained machine learning models that can automatically detect these elements without requiring custom model training, making it ideal for the use case described.

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Amazon Textract

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Amazon SageMaker

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Amazon Comprehend

Question 9

Which AWS service enables developers to add user sign-up, sign-in, and access control to web and mobile applications quickly?

Accepted Answer

Amazon Cognito. Amazon Cognito is the correct AWS service for adding user sign-up, sign-in, and access control to web and mobile applications. It provides identity pools and user pools that handle authentication, authorization, and user management, including social identity providers (e.g., Google, Facebook) and enterprise federation via SAML 2.0 or OIDC. This allows developers to quickly integrate these features without building custom backend infrastructure.

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AWS Directory Service

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AWS IAM Identity Center

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AWS IAM

Question 10

Which AWS service is a fully managed data warehousing service optimized for online analytical processing (OLAP) of large datasets?

Accepted Answer

Amazon Redshift. Amazon Redshift is a fully managed, petabyte-scale data warehouse service designed specifically for online analytical processing (OLAP) of large datasets. It uses columnar storage, massively parallel processing (MPP), and data compression to deliver fast query performance on structured and semi-structured data, making it the correct choice for OLAP workloads.

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Amazon RDS

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Amazon DynamoDB

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Amazon Aurora

Question 11

A company wants to run containerized applications without managing the underlying EC2 instances or clusters. Which AWS service enables this?

Accepted Answer

AWS Fargate. AWS Fargate is a serverless compute engine for containers that allows you to run containerized applications without managing the underlying EC2 instances or clusters. You define your task definitions and Fargate automatically provisions and scales the compute infrastructure, abstracting away the need to handle instance patching, capacity planning, or cluster management.

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Amazon EC2 with Docker installed

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Amazon ECS on EC2

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AWS Lambda

Question 12

Which AWS service provides a managed in-memory caching layer to reduce database load and improve application response times?

Accepted Answer

Amazon ElastiCache. Amazon ElastiCache is the correct answer because it provides a managed in-memory caching service that supports both Redis and Memcached, allowing applications to retrieve data from a fast, in-memory cache instead of querying a slower disk-based database. This reduces database load and improves application response times by serving frequently accessed data directly from the cache.

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Amazon DynamoDB Accelerator (DAX)

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Amazon CloudFront

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AWS Global Accelerator

Question 13

A media company stores video files in Amazon S3 and needs to transcode them into multiple formats for different devices. Which AWS service is purpose-built for this workflow?

Accepted Answer

Amazon Elastic Transcoder. Amazon Elastic Transcoder is a purpose-built media transcoding service that converts video files stored in Amazon S3 into the formats required by various devices. It handles the complexities of transcoding, including format conversion, resolution scaling, and bitrate adjustment, without requiring you to manage underlying infrastructure.

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Amazon Kinesis Video Streams

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AWS Lambda

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Amazon Rekognition

Question 14

Which AWS service provides a domain name system (DNS) that routes end-user requests to AWS infrastructure and external resources?

Accepted Answer

Amazon Route 53. Amazon Route 53 is a highly available and scalable cloud Domain Name System (DNS) web service. It is designed to route end-user requests to AWS infrastructure (such as EC2 instances, ELBs, and S3 buckets) and to external resources by translating human-readable domain names into IP addresses. This directly matches the question's requirement for a DNS-based routing service.

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AWS Global Accelerator

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Amazon CloudFront

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Elastic Load Balancing

Question 15

A company runs an application with variable workloads. During business hours, they need 10 EC2 instances; overnight they only need 2. Which combination minimizes cost while meeting this requirement?

Accepted Answer

2 Reserved Instances + Auto Scaling with On-Demand for variable demand. It uses 2 Reserved Instances to cover the baseline workload (overnight) at a lower cost, and Auto Scaling with On-Demand Instances to dynamically add capacity during business hours. Reserved Instances provide a significant discount over On-Demand for steady-state usage, while On-Demand instances handle variable demand without upfront commitment, minimizing total cost.

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10 On-Demand Instances running 24/7

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10 Reserved Instances

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10 Spot Instances with Auto Scaling