A company that hosts its web application on AWS wants to ensure all Amazon EC2 instances.
Amazon RDS DB instances and Amazon Redshift clusters are configured with tags.
The company wants to minimize the effort of configuring and operating this check.
What should a solutions architect do to accomplish this''

• A.Use AWS Config rules to define and detect resources that are not property tagged
• B.Use Cost Explorer to display resources that are not properly tagged Tag those resources manually.
• C.Write API calls to check all resources for proper tag allocation.
  Periodically run the code on an EC2 instance.
• D.Write API calls to check all resources for proper tag allocation.
  Schedule an AWS Lambda function through Amazon CloudWatch to periodically run the code

Correct Answer: C

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A company has an application that ingests incoming messages Dozens of other applications and microservices then quickly consume these messages The number of messages vanes drastically and sometimes increases suddenly to 100 000 each second. The company wants to decouple the solution and increase scalability.
Which solution meets these requirements?

• A.Deploy the ingestion application on Amazon EC2 instances m an Auto Scaling group to scale the number of EC2 instances based on CPU metrics
• B.Persist the messages to Amazon Kinesis Data Analytics Configure the consumer applications to read and process the messages
• C.Publish the messages to an Amazon Simple Notification Service (Amazon SNS) topic with multiple Amazon Simple Queue Service (Amazon SQS) subscriptions Configure the consumer applications to process the messages from the queues
• D.Write the messages to Amazon Kinesis Data Streams with a single shard Use an AWS Lambda function to preprocess messages and store them in Amazon DynamoDB Configure the consumer applications to read from DynamoDB to process the messages

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A company must generate sales reports at the beginning of every month. The reporting process launches 20 Amazon EC2 instances on the first of the month. The process runs for 7 days and cannot be interrupted. The company wants to minimize costs.
Which pricing model should the company choose?

• A.Reserved Instances
• B.Spot Block Instances
• C.On-Demand Instances
• D.Scheduled Reserved Instances
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Correct Answer: D

Explanation
Scheduled Reserved Instances
Scheduled Reserved Instances (Scheduled Instances) enable you to purchase capacity reservations that recur on a daily, weekly, or monthly basis, with a specified start time and duration, for a one-year term. You reserve the capacity in advance, so that you know it is available when you need it. You pay for the time that the instances are scheduled, even if you do not use them.
Scheduled Instances are a good choice for workloads that do not run continuously, but do run on a regular schedule. For example, you can use Scheduled Instances for an application that runs during business hours or for batch processing that runs at the end of the week.
If you require a capacity reservation on a continuous basis, Reserved Instances might meet your needs and decrease costs.
How Scheduled Instances Work
Amazon EC2 sets aside pools of EC2 instances in each Availability Zone for use as Scheduled Instances. Each pool supports a specific combination of instance type, operating system, and network.
To get started, you must search for an available schedule. You can search across multiple pools or a single pool. After you locate a suitable schedule, purchase it.
You must launch your Scheduled Instances during their scheduled time periods, using a launch configuration that matches the following attributes of the schedule that you purchased: instance type, Availability Zone, network, and platform. When you do so, Amazon EC2 launches EC2 instances on your behalf, based on the specified launch specification. Amazon EC2 must ensure that the EC2 instances have terminated by the end of the current scheduled time period so that the capacity is available for any other Scheduled Instances it is reserved for. Therefore, Amazon EC2 terminates the EC2 instances three minutes before the end of the current scheduled time period.
You can't stop or reboot Scheduled Instances, but you can terminate them manually as needed. If you terminate a Scheduled Instance before its current scheduled time period ends, you can launch it again after a few minutes. Otherwise, you must wait until the next scheduled time period.
The following diagram illustrates the lifecycle of a Scheduled Instance.

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-scheduled-instances.html

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A company has several web servers that need to frequently access a common Amazon RDS MySQL Multi-AZ instance. The company wants a secure method for the web servers to connect to thedatabase while meeting a security requirement to rotate user credentials frequently.
A company has several web servers that need to frequently access a common Amazon ROS MySQL Muto-AZ DB instance The company wants a secure method for the web servers to connect to the database while meeting a security requirement to rotate user credentials frequently Which solution meets these requirements^

• A.Store the database user credentials m AWS Systems Manager OpsCenter Grant the necessary 1AM permissions to allow the web servers to access OpsCenter
• B.Store the database user credentials in fries encrypted with AWS Key Management Service (AWS KMS) on the web server file system The web server should be able to decrypt the files and access the database
• C.Store the database user credentials in AWS Secrets Manager Grant the necessary 1AM permissions to allow the web servers to access AWS Secrets Manager
• D.Store the database user credentials in a secure Amazon S3 bucket Grant the necessary 1AM permissions to allow the web servers to retrieve credentials and access the database

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A company is developing a new machine learning model solution in AWS. The models are developed as independent microservices that fetch about 1 GB of model data from Amazon S3 at startup and load the data into memory. Users access the models through an asynchronous API. Users can send a request or a batch of requests and specify where the results should be sent.
The company provides models to hundreds of users. The usage patterns for the models are irregular Some models could be unused for days or weeks Other models could receive batches of thousands of requests at a time .
Which solution meets these requirements?

• A.The requests from the API are sent to the model's Amazon Simple Queue Service (Amazon SQS) queue. Models are deployed as Amazon Elastic Container Service (Amazon ECS) services reading from the queue AWS App Mesh scales the instances of the ECS cluster based on the SQS queue size'
• B.The requests from the API are sent to the models Amazon Simple Queue Service (Amazon SQS) queueModels are deployed as Amazon Elastic Container Service (Amazon ECS) services reading from the queue AWS Auto Scaling .s enabled on Amazon ECS for both the cluster and copies of the service based on the queue size.
• C.The requests from the API are sent to the models Amazon Simple Queue Service (Amazon SQS) queue. Models are deployed as AWS Lambda functions triggered by SQS events AWS Auto Scaling is enabled on Lambda to increase the number of vCPUs based on the SQS queue size
• D.The requests from the API are sent to an Application Load Balancer (ALB) Models are deployed as AWS Lambda functions invoked by the ALB.

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