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AWS Certified Machine Learning - Specialty

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Amazon MLS-C01 Sample Questions – Free Practice Test & Real Exam Prep

Question #1

A company builds computer-vision models that use deep learning for the autonomousvehicle industry. A machine learning (ML) specialist uses an Amazon EC2 instance thathas a CPU: GPU ratio of 12:1 to train the models.The ML specialist examines the instance metric logs and notices that the GPU is idle half ofthe time The ML specialist must reduce training costs without increasing the duration of thetraining jobs.Which solution will meet these requirements?

  • A. Switch to an instance type that has only CPUs.
  • B. Use a heterogeneous cluster that has two different instances groups.
  • C. Use memory-optimized EC2 Spot Instances for the training jobs.
  • D. Switch to an instance type that has a CPU GPU ratio of 6:1.
Answer: D
Explanation: Switching to an instance type that has a CPU: GPU ratio of 6:1 will reduce
the training costs by using fewer CPUs and GPUs, while maintaining the same level of
performance. The GPU idle time indicates that the CPU is not able to feed the GPU with
enough data, so reducing the CPU: GPU ratio will balance the workload and improve the
GPU utilization. A lower CPU: GPU ratio also means less overhead for inter-process
communication and synchronization between the CPU and GPU processes. References:
Optimizing GPU utilization for AI/ML workloads on Amazon EC2
Analyze CPU vs. GPU Performance for AWS Machine Learning
Question #2

An engraving company wants to automate its quality control process for plaques. Thecompany performs the process before mailing each customized plaque to a customer. Thecompany has created an Amazon S3 bucket that contains images of defects that shouldcause a plaque to be rejected. Low-confidence predictions must be sent to an internal teamof reviewers who are using Amazon Augmented Al (Amazon A2I).Which solution will meet these requirements?

  • A. Use Amazon Textract for automatic processing. Use Amazon A2I with AmazonMechanical Turk for manual review.
  • B. Use Amazon Rekognition for automatic processing. Use Amazon A2I with a privateworkforce option for manual review.
  • C. Use Amazon Transcribe for automatic processing. Use Amazon A2I with a privateworkforce option for manual review.
  • D. Use AWS Panorama for automatic processing Use Amazon A2I with AmazonMechanical Turk for manual review
Answer: B
Explanation: Amazon Rekognition is a service that provides computer vision capabilities
for image and video analysis, such as object, scene, and activity detection, face and text
recognition, and custom label detection. Amazon Rekognition can be used to automate the
quality control process for plaques by comparing the images of the plaques with the images
of defects in the Amazon S3 bucket and returning a confidence score for each defect.
Amazon A2I is a service that enables human review of machine learning predictions, such
as low-confidence predictions from Amazon Rekognition. Amazon A2I can be integrated
with a private workforce option, which allows the engraving company to use its own internal
team of reviewers to manually inspect the plaques that are flagged by Amazon
Rekognition. This solution meets the requirements of automating the quality control
process, sending low-confidence predictions to an internal team of reviewers, and using Amazon A2I for manual review. References:
1: Amazon Rekognition documentation
2: Amazon A2I documentation
3: Amazon Rekognition Custom Labels documentation
4: Amazon A2I Private Workforce documentation
Question #3

An Amazon SageMaker notebook instance is launched into Amazon VPC The SageMakernotebook references data contained in an Amazon S3 bucket in another account Thebucket is encrypted using SSE-KMS The instance returns an access denied error whentrying to access data in Amazon S3.Which of the following are required to access the bucket and avoid the access deniederror? (Select THREE)

  • A. An AWS KMS key policy that allows access to the customer master key (CMK)
  • B. A SageMaker notebook security group that allows access to Amazon S3
  • C. An 1AM role that allows access to the specific S3 bucket
  • D. A permissive S3 bucket policy
  • E. An S3 bucket owner that matches the notebook owner
  • F. A SegaMaker notebook subnet ACL that allow traffic to Amazon S3.
Answer: A,B,C
Explanation: To access an Amazon S3 bucket in another account that is encrypted using
SSE-KMS, the following are required:
A. An AWS KMS key policy that allows access to the customer master key (CMK).
The CMK is the encryption key that is used to encrypt and decrypt the data in the
S3 bucket. The KMS key policy defines who can use and manage the CMK. To
allow access to the CMK from another account, the key policy must include a
statement that grants the necessary permissions (such as kms:Decrypt) to the
principal from the other account (such as the SageMaker notebook IAM role).
B. A SageMaker notebook security group that allows access to Amazon S3. A
security group is a virtual firewall that controls the inbound and outbound traffic for
the SageMaker notebook instance. To allow the notebook instance to access the
S3 bucket, the security group must have a rule that allows outbound traffic to the
S3 endpoint on port 443 (HTTPS).
C. An IAM role that allows access to the specific S3 bucket. An IAM role is an
identity that can be assumed by the SageMaker notebook instance to access AWS
resources. The IAM role must have a policy that grants the necessary permissions
(such as s3:GetObject) to access the specific S3 bucket. The policy must also
include a condition that allows access to the CMK in the other account.
The following are not required or correct:
D. A permissive S3 bucket policy. A bucket policy is a resource-based policy that
defines who can access the S3 bucket and what actions they can perform. A
permissive bucket policy is not required and not recommended, as it can expose
the bucket to unauthorized access. A bucket policy should follow the principle of
least privilege and grant the minimum permissions necessary to the specific
principals that need access.
E. An S3 bucket owner that matches the notebook owner. The S3 bucket owner
and the notebook owner do not need to match, as long as the bucket owner grants
cross-account access to the notebook owner through the KMS key policy and the
bucket policy (if applicable).
F. A SegaMaker notebook subnet ACL that allow traffic to Amazon S3. A subnet
ACL is a network access control list that acts as an optional layer of security for
the SageMaker notebook instance’s subnet. A subnet ACL is not required to
access the S3 bucket, as the security group is sufficient to control the traffic.
However, if a subnet ACL is used, it must not block the traffic to the S3 endpoint.
Question #4

A machine learning (ML) engineer has created a feature repository in Amazon SageMakerFeature Store for the company. The company has AWS accounts for development,integration, and production. The company hosts a feature store in the developmentaccount. The company uses Amazon S3 buckets to store feature values offline. Thecompany wants to share features and to allow the integration account and the productionaccount to reuse the features that are in the feature repository. Which combination of steps will meet these requirements? (Select TWO.)

  • A. Create an IAM role in the development account that the integration account andproduction account can assume. Attach IAM policies to the role that allow access to thefeature repository and the S3 buckets.
  • B. Share the feature repository that is associated the S3 buckets from the developmentaccount to the integration account and the production account by using AWS ResourceAccess Manager (AWS RAM).
  • C. Use AWS Security Token Service (AWS STS) from the integration account and theproduction account to retrieve credentials for the development account.
  • D. Set up S3 replication between the development S3 buckets and the integration andproduction S3 buckets.
  • E. Create an AWS PrivateLink endpoint in the development account for SageMaker.
Answer: A,B
Explanation:
The combination of steps that will meet the requirements are to create an IAM role in the
development account that the integration account and production account can assume,
attach IAM policies to the role that allow access to the feature repository and the S3
buckets, and share the feature repository that is associated with the S3 buckets from the
development account to the integration account and the production account by using AWS
Resource Access Manager (AWS RAM). This approach will enable cross-account access
and sharing of the features stored in Amazon SageMaker Feature Store and Amazon S3.
Amazon SageMaker Feature Store is a fully managed, purpose-built repository to store,
update, search, and share curated data used in training and prediction workflows. The
service provides feature management capabilities such as enabling easy feature reuse, low
latency serving, time travel, and ensuring consistency between features used in training
and inference workflows. A feature group is a logical grouping of ML features whose
organization and structure is defined by a feature group schema. A feature group schema
consists of a list of feature definitions, each of which specifies the name, type, and
metadata of a feature. Amazon SageMaker Feature Store stores the features in both an
online store and an offline store. The online store is a low-latency, high-throughput store
that is optimized for real-time inference. The offline store is a historical store that is backed
by an Amazon S3 bucket and is optimized for batch processing and model training1.
AWS Identity and Access Management (IAM) is a web service that helps you securely
control access to AWS resources for your users. You use IAM to control who can use your
AWS resources (authentication) and what resources they can use and in what ways
(authorization). An IAM role is an IAM identity that you can create in your account that has
specific permissions. You can use an IAM role to delegate access to users, applications, or
services that don’t normally have access to your AWS resources. For example, you can create an IAM role in your development account that allows the integration account and the
production account to assume the role and access the resources in the development
account. You can attach IAM policies to the role that specify the permissions for the feature
repository and the S3 buckets. You can also use IAM conditions to restrict the access
based on the source account, IP address, or other factors2.
AWS Resource Access Manager (AWS RAM) is a service that enables you to easily and
securely share AWS resources with any AWS account or within your AWS Organization.
You can share AWS resources that you own with other accounts using resource shares. A
resource share is an entity that defines the resources that you want to share, and the
principals that you want to share with. For example, you can share the feature repository
that is associated with the S3 buckets from the development account to the integration
account and the production account by creating a resource share in AWS RAM. You can
specify the feature group ARN and the S3 bucket ARN as the resources, and the
integration account ID and the production account ID as the principals. You can also use
IAM policies to further control the access to the shared resources3.
The other options are either incorrect or unnecessary. Using AWS Security Token Service
(AWS STS) from the integration account and the production account to retrieve credentials
for the development account is not required, as the IAM role in the development account
can provide temporary security credentials for the cross-account access. Setting up S3
replication between the development S3 buckets and the integration and production S3
buckets would introduce redundancy and inconsistency, as the S3 buckets are already
shared through AWS RAM. Creating an AWS PrivateLink endpoint in the development
account for SageMaker is not relevant, as it is used to securely connect to SageMaker
services from a VPC, not from another account.
References:
1: Amazon SageMaker Feature Store – Amazon Web Services
2: What Is IAM? - AWS Identity and Access Management
3: What Is AWS Resource Access Manager? - AWS Resource Access Manager
Question #5

A network security vendor needs to ingest telemetry data from thousands of endpoints thatrun all over the world. The data is transmitted every 30 seconds in the form of records thatcontain 50 fields. Each record is up to 1 KB in size. The security vendor uses AmazonKinesis Data Streams to ingest the data. The vendor requires hourly summaries of therecords that Kinesis Data Streams ingests. The vendor will use Amazon Athena to querythe records and to generate the summaries. The Athena queries will target 7 to 12 of theavailable data fields.Which solution will meet these requirements with the LEAST amount of customization totransform and store the ingested data?

  • A. Use AWS Lambda to read and aggregate the data hourly. Transform the data and storeit in Amazon S3 by using Amazon Kinesis Data Firehose.
  • B. Use Amazon Kinesis Data Firehose to read and aggregate the data hourly. Transformthe data and store it in Amazon S3 by using a short-lived Amazon EMR cluster.
  • C. Use Amazon Kinesis Data Analytics to read and aggregate the data hourly. Transformthe data and store it in Amazon S3 by using Amazon Kinesis Data Firehose.
  • D. Use Amazon Kinesis Data Firehose to read and aggregate the data hourly. Transform the data and store it in Amazon S3 by using AWS Lambda.
Answer: C
Explanation: The solution that will meet the requirements with the least amount of
customization to transform and store the ingested data is to use Amazon Kinesis Data
Analytics to read and aggregate the data hourly, transform the data and store it in Amazon
S3 by using Amazon Kinesis Data Firehose. This solution leverages the built-in features of
Kinesis Data Analytics to perform SQL queries on streaming data and generate hourly
summaries. Kinesis Data Analytics can also output the transformed data to Kinesis Data
Firehose, which can then deliver the data to S3 in a specified format and partitioning
scheme. This solution does not require any custom code or additional infrastructure to
process the data. The other solutions either require more customization (such as using
Lambda or EMR) or do not meet the requirement of aggregating the data hourly (such as
using Lambda to read the data from Kinesis Data Streams). References:
1: Boosting Resiliency with an ML-based Telemetry Analytics Architecture | AWS
Architecture Blog
2: AWS Cloud Data Ingestion Patterns and Practices
3: IoT ingestion and Machine Learning analytics pipeline with AWS IoT …
4: AWS IoT Data Ingestion Simplified 101: The Complete Guide - Hevo Data
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