EMT Practice Test

1. Question Content...

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Question1: A Developer is working on an application that tracks hundreds of millions of product reviews in an Amazon DynamoDB table. The records include the data elements shown in the table:

Which field, when used as the partition key, would result in the MOST consistent performance using DynamoDB?

Question2: A developer has discovered that an application responsible for processing messages in an Amazon SQS queue is routinely falling behind. The application is capable of processing multiple messages in one execution, but is only receiving one message at a time What should the developer do to increase the number of messages the application receives?

Question3: A developer wants to use React to build a web and mobile application. The application will be hosted on AWS The application must authenticate users and then allow users to store and retrieve files that they own The developer wants to use Facebook for authentication Which CLI will MOST accelerate the development and deployment of this application on AWS?

Question4: A company stores all personally identifiable information (PII) in an Amazon DynamoDB table named PII in Account A.
An application running on Amazon EC2 instances in Account B requires access to the PII table. An administrators in Account A created an IAM role named AccessPII with privileges to access the PII table, and made account B a trusted entity.
Which combination of actional steps should Developers take to access the table? (Select TWO )

Question5: An application uploads photos to an Amazon S3 bucket. Each photo that is uploaded to the S3 bucket must be resized to a thumbnail image by the application Each thumbnail image is uploaded with a new name in the same S3 bucket Which AWS service can a developer configure to directly process each single S3 event for each S3 object upload?

Question6: A company recently migrated its web, application and NoSQL database tiers to AWS. The company is using Auto Scaling to scale the web and application tiers. More than 95 percent of the Amazon DynamoDB requests are repeated read-requests.
How can the DynamoDB NoSQL tier be scaled up to cache these repeated requests?

Question7: A Developer will be using the AWS CLI on a local development server to manage AWS services.
What can be done to ensure that the CLI uses the Developer's IAM permissions when making commands?

Question8: A developer has written an AWS Lambda function using Java as the runtime environment. The developer wants to isolate a performance bottleneck in the code.
Which steps should be taken to reveal the bottleneck?

Question9: What is the maximum number of S3 Buckets available per AWS account?

Question10: A company needs to secure its existing website running behind an Elastic Load Balancer. The website's Amazon EC2 instances are CPU-constrained.
What should be done to secure the website while not increasing the CPU load on the EC2 web servers? (Select TWO.)

Question11: A company is using Amazon RDS MySQL instances for its application database tier and Apache Tomcat servers for its web tier. Most of the database queries from web applications are repeated read requests.
Use of which AWS service would increase in performance by adding in-memory store for repeated read queries?

Question12: A serverless application uses an API Gateway and AWS Lambda.
Where should the Lambda function store its session information across function calls?

Question13: An application is using single -node Amazon ElastiCache for Redis instance to improve read performance. Over time, demand for the application has increased exponentially, which has increased the load on the ElastiCache instance. It is critical that this cache layer handles the load and is resilient in case of node failures.
What can the Developer do to address the load and resiliency requirements?

Question14: A developer has designed a customer, facing application that is running on an Amazon EC2 instance. The application logs every request made to it. The application usually runs seamlessly, but a spike in traffic generates several logs that cause the disk to fill up and eventually run out of memory Company policy requires old to be centralized for analysis.
Which long-term solution should the developer employ to prevent the issue from reoccurring?

Question15: A company has a legacy application that was migrated to a fleet of Amazon EC2 instances. The application stores data in a MySQL database that is currently installed on a single EC2 instance The company has decided to migrate the database from the EC2 instance to MySQL on Amazon RDS.
What should the developer do to update the application to support data storage in Amazon RDS?

Question16: What happens, by default, when one of the resources in a CloudFormation stack cannot be created?

Question17: A developer is designing a web application in which new users will use their email addresses to create accounts Millions of users are expected to sign up The application will store attributes for each user.
Which AWS service or feature should the developer implement to meet these requirements?

Question18: A customer wants to deploy its source code on an AWS Elastic Beanstalk environment. The customer needs to perform deployment with minimal outage and should only use existing instances to retain application access log.
What deployment policy would satisfy these requirements?

Question19: Which of the following programming languages have an officially supported AWS SDK? Choose 2 answers

Question20: A company is using an AWS Lambda function to process records from an Amazon Kinesis data stream The company recently observed slow processing of the records. A developer notices that the iterator age metric for the function is Increasing and that the Lambda run duration is constantly above normal.
Which actions should the developer take to increase the processing speed? (Select TWO.)

Question21: A company is providing services to many downstream consumers. Each consumer may connect to one or more services. This has resulted in a complex architecture that is difficult to manage and does not scale well. The company needs a single interface to manage these services to consumers.
Which AWS service should be used to refactor this architecture?

Question22: A development team is using AWS Elastic Beanstalk to deploy a two-tier application that consists of a load-balanced web tier and an Amazon RDS database tier in production. The team would like to separate the RDS instance from the Elastic Beanstalk.
How can this be accomplished?

Question23: An application is using a custom library to make HTTP calls directly to AWS service endpoints. The application is experiencing transient errors that are causing processes to stop when each error is first encountered A request has been made to make the application more resilient by adding error retries and exponential backoff.
How should a developer implement the changes with MINIMAL custom code?

Question24: Which statements about DynamoDB are true? Choose 2 answers

Question25: A developer Is working with a Docker application that needs to be quickly deployed using AWS without changing the infrastructure or configuring health checks. The application should be configured so that changes and updates can be made automatically without any downtime Which solution will meet these requirements?

Question26: A developer is working on a serverless application that needs lo process any changes to an Amazon DynamoDB table with an AWS Lambda function How should the developer configure the Lambda function to detect changes to the DynamoDB tabled

Question27: A Developer is designing a fault-tolerant environment where client sessions will be saved.
How can the Developer ensure that no sessions are lost if an Amazon EC2 instance fails?

Question28: A startup s photo-sharing site is deployed in a VPC. An ELB distributes web traffic across two subnets. ELB session stickiness is configured to use the AWS-generated session cookie, with a session TTL of 5 minutes. The webserver Auto Scaling Group is configured as: min-size=4, max-size=4.
The startups preparing for a public launch, by running load-testing software installed on a single EC2 instance running in us-west-2 a. After 60 minutes of load-testing, the webserver logs show:
Which recommendations can help ensure load-testing HTTP requests are evenly distributed across the four webservers? Choose 2 answers

Question29: A large company has its application components distributed across.. company needs to collect and visualize trace data across these accounts.
What should be used to meet these requirements?

Question30: A developer wants to modify the following AWS Cloud Formation template to embed another CloudFormation stack:

Which syntax should the developer add to the blank line of the CloudFormation template to meet this requirement?

Question31: A developer added a new feature to an application running on an Amazon EC2 instance that uses Amazon SQS After deployment, the developer noticed a significant increase in Amazon SQS costs. When monitoring the Amazon SQS metrics on Amazon CloudWatch. the developer found that on average one message per minute is posted on this queue.
What can be done to reduce Amazon SQS costs for this application?

Question32: A Developer needs to deploy an application running on AWS Fargate using Amazon ECS. The application has environment variables that must be passed to a container tor the application to initialize How should the environment variables be passed to the container?

Question33: A Developer has created a Lambda function and is finding that the function is taking longer to complete than expected. After some debugging, the Developer has discovered that increasing compute capacity would improve performance.
How can the Developer increase the Lambda compute resources?

Question34: A Development team currently supports an application that uses an in-memory store to save accumulated game results. Individual results are stored in a database. As part of migrating to AWS, the team needs to use automatic scaling. The team knows this will yield inconsistent results.
Where should the team store these accumulated game results to BEST allow for consistent results without impacting performance?

Question35: A Developer must deploy a new AWS Lambda function using an AWS CloudFormation template.
Which procedures will deploy a Lambda function? (Select TWO.)

Question36: A Developer must analyze performance issues with production-distributed applications written as AWS Lambda functions. These distributed Lambda applications invoke other components that make up the applications.
How should the Developer identify and troubleshoot the root cause of the performance issues in production?

Question37: A company is providing read access to objects in an Amazon S3 bucket for different customers The company uses 1AM permissions to restnct access to the S3 bucket The customers can access only their own files Due to a regulation requirement the company needs to enforce encryption in transit for interactions with Amazon S3 Which solution will meet these requirements?

Question38: A Developer is creating a Lambda function and will be using external libraries that are not included in the standard Lambda libraries.
What action would minimize the Lambda compute time consumed?

Question39: A company experienced partial downtime during the last deployment of a new application AWS Elastic Beanstalk split the environment's Amazon EC2 instances into batches and deployed a new version one batch at a time after taking them out of service. Therefore, full capacity was not maintained during deployment.
The developer plans to release a new version of the application, and is looking for a policy that will maintain full capacity and minimize the impact of the failed deployment Which deployment policy should the developer use?

Question40: Which of the following are valid SNS delivery transports? Choose 2 answers

Question41: A developer Is designing an AWS Lambda function that create temporary files that are less than 10 MB during execution. The temporary files will be accessed and modified multiple times during execution. The developer has no need to save or retrieve these files in the future.
Where should the temporary file be stored?

Question42: An application running on EC2 instances is storing data in an S3 bucket. Security policy mandates that all data must be encrypted in transit.
How can the Developer ensure that all traffic to the S3 bucket is encrypted?

Question43: AWS CodeBuild builds code for an application, creates the Docker image, pushes the image to Amazon Elastic Container Registry (Amazon ECR), and tags the image with a unique identifier.
If the Developers already have AWS CLI configured on their workstations, how can the Docker images be pulled to the workstations?

Question44: Where can PortMapping be defined when launching containers in Amazon ECS?

Question45: You run an ad-supported photo sharing website using S3 to serve photos to visitors of your site. At some point you find out that other sites have been linking to the photos on your site, causing loss to your business.
What is an effective method to mitigate this?

Question46: A company's ecommerce website is experiencing massive traffic spikes, which are causing performance problems in the company database. Users are reporting that accessing the website takes a long time A developer wants to implement a caching layer using Amazon ElastiCache. The website is required to be responsive no matter which product a user views, and the updates to product information and prices must be strongly consistent

Question47: Which of the following statements about SQS is true?

Question48: A Developer has been asked to create an AWS Lambda function that is triggered any time updates are made to items in an Amazon DynamoDB table. The function has been created, and appropriate permissions have been added to the Lambda execution role. Amazon DynamoDB streams have been enabled for the table, but the function is still not being triggered.
Which option would enable DynamoDB table updates to trigger the Lambda function?

Question49: company needs a fully-managed source control service that will work in AWS. The service must ensure that revision control synchronizes multiple distributed repositories by exchanging sets of changes peer-to-peer. All users need to work productively even when not connected to a network.
Which source control service should be used?

Question50: After installing the AWS CLI, a Developer tries to run the command aws configure but receives the following error:
Error: aws: command not found
What is the most likely cause of this error?

Question51: A Developer is receiving HTTP 400: ThrottlingException errors intermittently when calling the Amazon CloudWatch API. When a call fails, no data is retrieved.
What best practice should first be applied to address this issue?

Question52: A developer needs to create an application that supports Security Assertion Markup Language (SAML) and Facebook authentication It must also allow access to AWS services, such as Amazon DynamoDB.
Which AWS service or feature will meet these requirements with the LEAST amount of additional coding?

Question53: A web application is using Amazon Kinesis Streams for clickstream data that may not be consumed for up to 12 hours.
How can the Developer implement encryption at rest for data within the Kinesis Streams?

Question54: An application stops working with the following error: The specified bucket does not exist. Where is the BEST place to start the root cause analysis?

Question55: A development team is creating a new application designed to run on AWS. While the test and production environments will run on Amazon EC2 instances, developers will each run their own environment on their laptops.
Which of the following is the simplest and MOST secure way to access AWS services from the local development machines?

Question56: An application is processing clickslream data using Amazon Kinesis. The clickstream data feed into Kinesis experiences periodic spikes. The PutRecords API call occasionally fails and the logs show that the failed call returns the response shown below.

Which techniques will help mitigate this exception? (Select TWO.)

Question57: A developer must cache dependent artifacts from Maven Central, a public package repository, as part of an application's build pipeline The build pipeline has an AWS CodeArtifact repository where artifacts of the build are published The developer needs a solution that requires minimum changes to the build pipeline Which solution meets these requirements?

Question58: The Lambda function below is being called through an API using Amazon API Gateway. The average execution time for the Lambda function is about 1 second. The pseudocode for the Lambda function is as shown in the exhibit.

What two actions can be taken to improve the performance of this Lambda function without increasing the cost of the solution? (Select two.)

Question59: An application uses Amazon DynamoDB as its backend database The application experiences sudden spikes in traffic over the weekend and variable but predictable spikes during weekdays The capacity needs to be set to avoid throttling errors at all times How can this be accomplished cost-effectively?

Question60: A video-hosting website has two types of members: those who pay a fee. and those who do not Each video upload places a message in Amazon SQS A fleet of Amazon EC2 instances polls Amazon SQS and processes each video The developer needs to ensure that the videos uploaded by the paying members are processed first How can the developer meet this requirement?

Question61: A Developer is making changes to a custom application that is currently using AWS Elastic Beanstalk.
After the Developer completes the changes, what solutions will update the Elastic Beanstalk environment with the new application version? (Choose two.)

Question62: A developer is building an application that needs to store date in Amazon S3. Management requires that the data be encrypted before is it sent to Amazon S3 for storage. The encryption keys need to be managed by the security team.
Which approach should the developer take to meet these requirements?

Question63: A company is developing a serverless ecommerce web application The application needs to make coordinated, all-or-nothing changes to multiple items in the company's inventory table in Amazon DynamoDB.
Which solution will meet these requirements?

Question64: A developer has written an application hosted on Amazon EC2 instances. The application generates and uploads thousands of new objects to an Amazon S3 bucket located in the same AWS region. The size of each object is less than 1 MB. The application is taking too long to run.
How can the performance of the application be improved?

Question65: A website's page load times are gradually increasing as more users access the system at the same time. Analysis indicates that a user profile is being loaded from a database in all the web pages being visited by each user and this is increasing the database load and the page load latency. To address this issue the Developer decides to cache the user profile data.
Which caching strategy will address this situation MOST efficiently?

Question66: A development team uses AWS Elastic Beanstalk for application deployment. The team has configured the application version lifecycle policy to limit the number of application versions to 25 However even with the lifecycle policy the source bundle is deleted from the Amazon S3 source bucket What should a developer do in the Elastic Beanstalk application version lifecycle settings to retain the source code in the S3 bucket?

Question67: A developer wants to send multi-value headers to an AWS Lambda function that is registered as a target with an Application Load Balancer (ALB).
What should the developer do to achieve this?

Question68: A developer is building an application integrating an Amazon API Gateway with an AWS Lambda function. When calling the API, the developer receives the following error. Wed Nov 03 01:13:00 UTC 2017 : Method completed with status: 502 What should the developer do to resolve the error?

Question69: A company has a website that is developed in PHP and WordPress and is launched using AWS Elastic Beanstalk. There is a new version of the website that needs to be deployed in the Elastic Beanstalk environment. The company cannot tolerate having the website offline if an update fails. Deployments must have minimal impact and rollback as soon as possible.
What deployment method should be used?

Question70: An AWS Lambda function must read data from an Amazon RDS MySQL database in a VPC and also reach a public endpoint over the internet to get additional data.
Which steps must be taken to allow the function to access both the RDS resource and the public endpoint? (Select TWO.)

Question71: A developer has written a multi-threaded application that is running on a fleet of Amazon EC2 instances. The operations team has requested a graphical method to monitor the number of running threads over time.
What is the MOST efficient way to fulfill this request?

Question72: A global company has an application running on Amazon EC2 instances that serves image files from Amazon S3. User requests from the browser are causing high traffic, which results in degraded performance.
Which optimization solution should a Developer implement to increase application performance?

Question73: A developer is building an application that reads 90 Items of data each second from an Amazon DynamoDB table. Each item Is 3 KB m size. The table is configured to use eventually consistent reads How many read capacity units should the developer provision for the table?

Question74: A Developer has created a large Lambda function, and deployment is failing with the following error:
ClientError: An error occurred (InvalidParameterValueException) when calling the CreateFunction operation: Unzipped size must be smaller than XXXXXXXXX bytes', where XXXXXXXXX is the current Lambda limit What can the Developer do to fix this problem?

Question75: A company is creating an application that will require users to access AWS services and allow them to reset their own passwords.
Which of the following would allow the company to manage users and authorization while allowing users to reset their own passwords?

Question76: An application running on Amazon EC2 opens connections to an Amazon RDS SQL Server database The developer does not want to store the user name and password for the database in the code. The developer would also like to automatically rotate the credentials.
What is the MOST secure way to store and access the database credentials?

Question77: A company is running an application built on AWS Lambda functions. One Lambda function has performance issues when it has to download a 50MB file from the Internet in every execution. This function is called multiple times a second.
What solution would give the BEST performance increase?

Question78: A Developer is going to deploy an AWS Lambda function that requires significant CPU utilization. Which approach will MINIMIZE the average runtime of the function?

Question79: Which of the following are good use cases for how Amazon ElastiCache can help an application? (Select TWO.)

Question80: A developer is building a static, client-side rendered website that is powered by ReactJS The code has no server-side generated components and does not need to run any programming languages on the server However the code serves static HTML, CSS, and JavaScript to the client on each request The developer's solution to host the website must maximize performance and cost-effectiveness Which combination of AWS services or resources should the developer use to meet these requirements?

Question81: Company C is currently hosting their corporate site in an Amazon S3 bucket with Static Website Hosting enabled. Currently, when visitors go to http://www.companyc.com the index.html page is returned. Company C now would like a new page welcome.html to be returned when a visitor enters http://www.companyc.com in the browser.
Which of the following steps will allow Company C to meet this requirement? Choose 2 answers

Question82: An organization must store thousands of sensitive audio and video files in an Amazon S3 bucket.
Organizational security policies require that all data written to this bucket be encrypted.
How can compliance with this policy be ensured?

Question83: A company has multiple Developers located across the globe who are updating code incrementally for a development project. When Developers upload code concurrently, internet connectivity is slow, and it is taking a long time to upload code for deployment in AWS Elastic Beanstalk.
Which step will result in minimized upload and deployment time with the LEAST amount of administrative effort?

Question84: A Developer is building a three-tier web application that should be able to handle a minimum of 5000 requests per minute. Requirements state that the web tier should be completely stateless while the application maintains session state for the users.
How can session data be externalized, keeping latency at the LOWEST possible value?

Question85: A company is using Amazon API Gateway to manage its public-facing API. The CISO requires that the APIs be used by test account users only. What is the MOST secure way to restrict API access to users of this particular AWS account?

Question86: What does an Amazon SQS delay queue accomplish?

Question87: A developer is setting up Amazon API Gateway for their company's products. The API will be used by registered developers to query and update their environments. The company wants to limit the amount of requests end users can send for both cost and security reasons Management wants to offer registered developers the option of buying larger packages that allow for more requests.
How can the developer accomplish this with the LEAST amount of overhead management?

Question88: A company is using Amazon API Gateway to manage access to a set of microservices implemented as AWS Lambda functions. Following a bug report, the company makes a minor breaking change to one of the APIs.
In order to avoid impacting existing clients when the new API is deployed, the company wants to allow clients six months to migrate from v1 to v2.
Which approach should the Developer use to handle this change?

Question89: A developer is writing an AWS Lambda function. The developer wants to log key events that occur during the Lambda function and include a unique identifier to associate the events with a specific function invocation Which of the following will help the developer accomplish this objective?

Question90: Your application is trying to upload a 6 GB file to Simple Storage Service and receive a "Your proposed upload exceeds the maximum allowed object size." error message.
What is a possible solution for this?

Question91: A developer receives the following error message when trying to launch or terminate an Amazon EC2 instance using a boto3 script.

What should the developer do to correct this error message?

Question92: A company is migrating its on-premises database to Amazon RDS for MySQL. The company has read-heavy workloads, and wants to make sure it re-factors its code to achieve optimum read performance for its queries.
How can this objective be met?

Question93: A company has three different environments: Development, QA, and Production. The company wants to deploy its code first in the Development environment, then QA, and then Production.
Which AWS service can be used to meet this requirement?

Question94: A game stores user game data in an Amazon DynamoDB table. Individual users should not have access to other users' game dat a. How can this be accomplished?

Question95: A Developer is migrating an on-premises application to AWS. The application currently takes user uploads and saves them to a local directory on the server. All uploads must be saved and made immediately available to all instances in an Auto scaling group.
Which approach will meet these requirements?

Question96: How can software determine the public and private IP addresses of the Amazon EC2 instance that it is running on?

Question97: An application reads data from an Amazon DynamoDB table. Several times a day, for a period of 15 seconds, the application receives multiple ProvisionedThroughputExceeded errors.
How should this exception be handled?

Question98: A developer used the BalehWnteltern API operation to insert items in an Amazon DynamoDB table OynamoDB returned a few items as unprocessed due to throttling The developer decides to retry the records on the unprocessed items What should the developer do to reprocess the records with the LEAST number of API calls'?

Question99: A developer is changing the configuration for a CPU-intensive AWS Lambda function that runs once an hour. The function usually takes 45 seconds to run, but sometimes the run time is up to 1 minute. The timeout parameter is set to 3 minutes, and all other parameters are set to default.
The developer needs to optimize the run time of this function.
Which solution will meet this requirement?

Question100: A company needs to encrypt data at rest, but it wants to leverage an AWS managed service using its own master key.
Which of the following AWS service can be used to meet these requirements?

Question101: A Developer has developed a web application and wants to deploy it quickly on a Tomcat server on AWS. The Developer wants to avoid having to manage the underlying infrastructure.
What is the easiest way to deploy the application, based on these requirements?

Question102: A developer has an AWS CodePipelme pipeline that invokes AWS CodeBuild in the build stage The developer wants to pass in a variable from CodePipelme so that the variable can be read in the CodeBuild buildspec yml file How can the developer accomplish this goal?

Question103: A company hosts a client-side web application for one of its subsidiaries on Amazon S3. The web application can be accessed through Amazon CloudFront from https://www.example.com. After a successful rollout, the company wants to host three more client-side web applications for its remaining subsidiaries on three separate S3 buckets.
To achieve this goal, a developer moves all the common JavaScript files and web fonts to a central S3 bucket that serves the web applications. However, during testing, the developer notices that the browser blocks the JavaScript files and web fonts.
What should the developer do to prevent the browser from blocking the JavaScript files and web fonts?

Question104: A Developer accesses AWS CodeCommit over SSH. The SSH keys configured to access AWS CodeCommit are tied to a user with the following permissions:

The Developer needs to create/delete branches.
Which specific IAM permissions need to be added, based on the principle of least privilege?

Question105: A developer is creating AWS CloudFormation templates to manage an application's deployment in Amazon Elastic Container Service (Amazon ECS) through AWS CodeDeploy. The developer wants to automatically deploy new versions of the application to a percentage of users before the new version becomes available for all users.
How should the developer manage the deployment of the new version?

Question106: A software company needs to make sure user-uploaded documents are securely stored in Amazon S3. The documents must be encrypted at rest in Amazon S3. The company does not want to manage the security infrastructure in-house, but the company still needs extra protection to ensure it has control over its encryption keys due to industry regulations Which encryption strategy should a developer use to meet these requirements?

Question107: A developer has a legacy application that is hosted on-premises Other applications hosted on AWS depend on the on-premises application for proper functioning In case of any application errors, the developer wants to be able to use Amazon CloudWatch to monitor and troubleshoot all applications from one place.
How can the developer accomplish this?

Question108: A developer is provided with an HTTPS clone URL for an AWS CodeCommit repository.
What needs to be configured before cloning this repository?

Question109: An application will ingest data at a very high throughput from many sources and must store the data in an Amazon S3 bucket. Which service would BEST accomplish this task?

Question110: A large e-commerce site is being designed to deliver static objects from Amazon S3. The Amazon S3 bucket wills server more than 300 GET requests per second. What should be done to optimize performance? (Select TWO.)

Question111: A company needs to ingest terabytes of data each hour from thousands of sources that are delivered almost continually throughout the day. The volume of messages generated varies over the course of the day. Messages must be delivered in real time for fraud detection and live operational dashboards.
Which approach will meet these requirements?

Question112: A company s website runs on an Amazon EC2 instance and uses Auto Scale the environment during peak times Website users across the world are experiencing high to sea latency due to static content on the EC2 instance, even during non-peak hours.
Which combination of steps will resolve the latency issue? (Select TWO )

Question113: A current architecture uses many Lambda functions invoking one another as a large state machine. The coordination of this state machine is legacy custom code that breaks easily.
Which AWS Service can help refactor and manage the state machine?

Question114: A company has an application that logs all information to Amazon S3. Whenever there is a new log file, an AWS Lambda function is invoked to process the log files. The code works, gathering all of the necessary information. However, when checking the Lambda function logs, duplicate entries with the same request ID are found.
What is causing the duplicate entries?

Question115: EC2 instances are launched from Amazon Machine images (AMIs). A given public AMI can:

Question116: A meteorological system monitors 600 temperature gauges, obtaining temperature samples every minute and saving each sample to a DynamoDB table. Each sample involves writing 1K of data and the writes are evenly distributed over time.
How much write throughput is required for the target table?

Question117: A gaming application stores scores for players in an Amazon DynamoDB table that has four attributes user_id, user_name, user_score, and user_rank. The users are allowed to update their names only A user is authenticated by web identity federation.
Which set of conditions should be added in the policy attached to the role for the dynamodb Putltem API call?
A)
B)

C)

D)

Question118: An application is designed to use Amazon SQS to manage messages from many independent senders. Each sender's messages must be processed in the order they are received.
Which SQS feature should be implemented by the Developer?

Question119: A company hosts a monolithic application on Amazon EC2 instances. The company starts converting some features of the application to a serverless architecture by using Amazon API Gateway and AWS Lambda After the migration, some users report problems with payment processing Upon inspection, a developer discovers that the Lambda function that calls the external payment API is taking longer than expected Therefore, the API Gateway requests are timing out What should the developer do to resolve this issue in the serverless architecture1?

Question120: A company is using continuous integration and continuous delivery systems. A Developer now needs to automate a software package deployment to both Amazon EC2 instances and virtual servers running on-premises.
Which AWS service should be used to accomplish this?

Question121: A developer has built an application running on AWS Lambda using AWS Serverless Application Model (AWS SAM). What is the correct order of execution to successfully deploy the application?

Question122: A developer is trying to monitor an application's status by running a cron job that returns 1 if the service is up and 0 if the service is down. The developer created code that uses an AWS CLI put-metric-alarm command to publish the custom metrics to Amazon CloudWatch and create an alarm However the developer is unable to create an alarm as the custom metrics do not appear m the CloudWatch console.
What is causing this issue?

Question123: An application needs to encrypt data that is written to Amazon S3 where the keys are managed in an on-premises data center and the encryption is handled by S3. Which type of encryption should be used?

Question124: An application ingests a large number of small messages and stores them in a database. The application uses AWS Lambd a. A development team is making changes to the application's processing logic. In testing, it is taking more than 15 minutes to process each message. The team is concerned the current backend may time out.
Which changes should be made to the backend system to ensure each message is processed in the MOST scalable way1?

Question125: A developer is deploying an application in the AWS Cloud by using AWS CloudFormation. The application will connect to an existing Amazon RDS database. The hostname of the RDS database is stored in AWS Systems Manager Parameter Store as a plaintext value. The developer needs to incorporate the database hostname into the CloudFormation template to initialize the application when the stack is created How should the developer reference the parameter that contains the database hostname?

Question126: An application displays a status dashboard. The status is updated by 1 KB messages from an SQS queue. Although the status changes infrequently, the Developer must minimize the time between the message arrival in the queue and the dashboard update.
What technique provides the shortest delay in updating the dashboard?

Question127: A Developer wants access to make the log data of an application running on an EC2 instance available to systems administrators.
Which of the following enables monitoring of this metric in Amazon CloudWatch?

Question128: A company is building an application to track athlete performance using an Amazon DynamoDB table. Each item in the table is identified by a partition key (user_id) and a sort key (sport_name). The table design is shown below:
(Note: Not all table attributes are shown)
A Developer is asked to write a leaderboard application to display the top performers (user_id) based on the score for each sport_name.
What process will allow the Developer to extract results MOST efficiently from the DynamoDB table?

Question129: A developer is troubleshooting a three-tier application, which is deployed on Amazon EC2 instances. There is a connectivity problem between the application servers and the database servers.
Which AWS services or tools should be used to identify the faulty component? (Select TWO.)

Question130: A developer is using Amazon S3 as the event source that invokes a Lambda function when new objects are created in the bucket The event source mapping Information Is stored in the bucket notification configuration The developer is working with different versions of the Lambda function, and has a constant need to update notification configuration so that Amazon S3 invokes the correct version What is the MOST efficient and effective way to achieve mapping Between the S3 event and Lambda?

Question131: The release process workflow of an application requires a manual approval before the code is deployed into the production environment.
What is the BEST way to achieve this using AWS CodePipeline?

Question132: A company is building a compute-intensive application that will run on a fleet of Amazon EC2 instances. The application uses attached Amazon EBS disks for storing dat a. The application will process sensitive information and all the data must be encrypted.
What should a developer do to ensure the data is encrypted on disk without impacting performance?

Question133: A company wants to implement authentication for its new REST service using Amazon API Gateway. To authenticate the calls, each request must include HTTP headers with a client ID and user ID. These credentials must be compared to authentication data in an Amazon DynamoDB table.
What MUST the company do to implement this authentication in API Gateway?

Question134: A developer is building an application on Amazon EC2 The developer encountered an "Access Denied" error on some of the API calls to AWS services while testing The developer needs to modify permissions that have been already given to the instance How can these requirements be met with minimal changes and minimum downtime?

Question135: An application running on multiple Amazon EC2 instances pulls messages ...SQS queue. A requirement for the application is that all messages must be encrypted at rest.
Developers are instructed to use methods that allow for centralized .. possible support requirements whenever possible.
Which of the following solution supports these requirements?

Question136: What is one key difference between an Amazon EBS-backed and an instance-store backed instance?

Question137: A Developer is trying to make API calls using SDK. The IAM user credentials used by the application require multi-factor authentication for all API calls.
Which method the Developer use to access the multi-factor authentication protected API?

Question138: A developer must ensure that the IAM credentials used by an application in Amazon EC2 are not misused or compromised What should the developer use to keep user credentials secure?

Question139: Developer is creating an AWS Lambda function to process a stream of data from an Amazon Kinesis Data Stream. When the Lambda function parses the data and encounters a missing field, it exits the function with an error. The function is generating duplicate records from the Kinesis stream. When the Developer looks at the stream output without the Lambda function, there are no duplicate records.
What is the reason for the duplicates?

Question140: A gaming company is developing a mobile game application for iOS® and Android® platforms. This mobile game securely stores user data locally on the device. The company wants to allow users to use multiple device for the game, which requires user data synchronization across device.
Which service should be used to synchronize user data across devices without the need to create a backend application?

Question141: If a message is retrieved from a queue in Amazon SQS, how long is the message inaccessible to other users by default?

Question142: How does Envelope Encryption work in AWS KMS?

Question143: A development team wants to immediately build and deploy an application whenever there is a change to the source code. Which approaches could be used to trigger the deployment? (Select TWO.)

Question144: A Developer is writing an application that runs on Amazon EC2 instances in an Auto scaling group. The application data is stored in an Amazon DynamoDB table and records are constantly updated by all instances. An instance sometimes retrieves old dat a. The Developer wants to correct this by making sure the reads are strongly consistent.
How can the developer accomplish this?

Question145: Company C has recently launched an online commerce site for bicycles on AWS. They have a "Product" DynamoDB table that stores details for each bicycle, such as, manufacturer, color, price, quantity and size to display in the online store. Due to customer demand, they want to include an image for each bicycle along with the existing details.
Which approach below provides the least impact to provisioned throughput on the "Product" table?

Question146: A developer is writing an application to analyze the traffic to a fleet of Amazon EC2 instances The EC2 instances run behind a public Application Load Balancer (ALB). An HTTP server runs on each of the EC2 instances, logging all requests to a log file.
The developer wants to capture the client public IP addresses. The developer analyzes the log files and notices only the IP address of the ALB What must the developer do to capture the client public IP addresses in the log file?

Question147: A developer is updating an application deployed on AWS Elastic Beanstalk The new version is incompatible with the old version To successfully deploy the update, a full cutover to the new updated version must be performed on all instances at one time, with the ability to roll back changes in case of a deployment failure in the new version How can this be performed with the LEAST amount of downtime?

Question148: A company is migrating the content delivery network for its dynamic PHP website to AWS An Amazon CloudFront web distribution is part of the new infrastructure The distribution has the following cache behavior settings
* Allowed HTTP Methods is set to GET HEAD
* Viewer Protocol Policy is set to HTTP and HTTPS
Developers test the solution and can reach the company's website over HTTP and HTTPS However the developers are unable to log in to the previously working administration panel of the website Which action will resolve this login issue?

Question149: An application stores payroll information nightly in DynamoDB for a large number of employees across hundreds of offices. Item attributes consist of individual name, office identifier, and cumulative daily hours. Managers run reports for ranges of names working in their office. One query is. "Return all Items in this office for names starting with A through E".
Which table configuration will result in the lowest impact on provisioned throughput for this query?

Question150: A developer needs to manage AWS infrastructure as code and must be able to deploy multiple identical copies of the infrastructure, stage changes, and revert to previous versions.
Which approach addresses these requirements?

Question151: A company is running a custom application on a set of on-premises Linux servers that are accessed using Amazon API Gateway. AWS X-Ray tracing has been enabled on the API test stage How can a developer enable X-Ray tracing on the on-premises servers with the LEAST amount of configuration''

Question152: A Developer must encrypt a 100-GB object using AWS KMS.
What is the BEST approach?

Question153: A developer has written an application that uses Amazon API Gateway and AWS Lambd a. The developer needs to configure the application so that the developer can visualize the application's components and identify performance bottlenecks What should the developer do to meet these requirements?

Question154: A company is migrating a single-server, on-premises web application to AWS. The company intends to use multiple servers behind an Elastic Load Balancer (ELB) to balance the load, and will also store session data in memory on the web server. The company does not want to lose that session data if a server fails or goes offline, and it wants to minimize user's downtime.
Where should the company move session data to MOST effectively reduce downtime and make users' session data more fault tolerant?

Question155: A company is developing a report executed by AWS Step Functions Amazon CloudWatch shows errors in the Step Functions task state machine To troubleshoot each task, the state input needs to be included along with the error message in the state output.
Which coding practice can preserve both the original input and the error for the state?

Question156: To include objects defined by the AWS Serverless Application Model (SAM) in an AWS CloudFormation template, in addition to Resources, what section MUST be included in the document root?

Question157: A developer must modify an Alexa skill backed by an AWS Lambda function to access an Amazon DynamoDB table in a second account A role in the second account has been created with permissions to access the table How should the table be accessed?

Question158: A development team is working on a mobile app that allows users to upload pictures to Amazon S3 The team expects the app will be used by hundreds of thousands of users during a single event simultaneously Once the pictures are uploaded, the backend service will scan and parse the pictures for inappropriate content.
Which approach is the MOST resilient way to achieve this goal which also smooths out temporary volume spikes for the backend service?

Question159: A company uses Amazon DynamoDB for managing and tracking orders. The DynamoDB table is partitioned based on the order date. The company receives a huge increase in orders during a sales event, causing DynamoDB writes to throttle, and the consumed throughput is far below the provisioned throughput.
According to AWS best practices, how can this issue be resolved with MINIMAL costs?

Question160: A developer has written a serverless application and wants to deploy it to AWS Lambda to leverage the function's multi-threaded execution to improve performance. Which action should the developer take to achieve these requirements?

Question161: A Developer wants to use AWS X-Ray to trace a user request end-to-end throughput the software stack. The Developer made the necessary changes in the application tested it, and found that the application is able to send the traces to AWS X-Ray. However, when the application is deployed to an EC2 instance, the traces are not available.
Which of the following could create this situation? (Select two.)

Question162: An application deployed on AWS Elastic Beanstalk experiences increased error rates during deployments of new application versions, resulting in service degradation for users. The Development team believes that this is because of the reduction in capacity during the deployment steps. The team would like to change the deployment policy configuration of the environment to an option that maintains full capacity during deployment while using the existing instances.
Which deployment policy will meet these requirements while using the existing instances?

Question163: An Amazon RDS database instance is used by many applications to look up historical dat a. The query rate is relatively constant. When the historical data is updated each day, the resulting write traffic slows the read query performance and affects all application users.
What can be done to eliminate the performance impact on application users?

Question164: A developer must build a mobile application that allows users to read and write data from an Amazon DynamoDB table to store user state for each unique user. The solution needs to limit data access to allow users access only to their own data Which solution below is the most secure?

Question165: What are the steps to using the AWS CLI to launch a templatized serverless application?

Question166: An application writes items to an Amazon DynamoDB table. As the application scales to thousands of instances, calls to the DynamoDB API generate occasional ThrottlingException errors. The application is coded in a language incompatible with the AWS SDK.
How should the error be handled?

Question167: When a Simple Queue Service message triggers a task that takes 5 minutes to complete, which process below will result in successful processing of the message and remove it from the queue while minimizing the chances of duplicate processing?

Question168: A company developed a set of APIs that are being served through the Amazon API Gateway. The API calls need to be authenticated based on OpenID identity providers such as Amazon or Facebook. The APIs should allow access based on a custom authorization model.
Which is the simplest and MOST secure design to use to build an authentication and authorization model for the APIs?

Question169: A developer wants to ensure the Amazon EC2 instances in AWS Elastic Beanstalk execute a certain set of commands before the application is ready to use Which Elastic Beanstalk feature will allow the developer to accomplish this?

Question170: A developer is working on an AWS Lambda function that accesses Amazon DynamoDB The Lambda function must retrieve an item and update some of its attributes. or create the item if it does not exist. The Lambda function has access to the primary key.
Which IAM permissions should the developer request for the Lambda function to achieve this functionality?

Question171: Which DynamoDB limits can be raised by contacting AWS support? Choose 2 answers

Question172: A company wants to migrate an existing web application to AWS. The application consists of two web servers and a MySQL database The company wants the application to automatically scale in response to demand The company also wants to reduce its operational overhead for database backups and maintenance The company needs the ability to deploy multiple versions of the application concurrently What is the MOST operationally efficient solution that meets these requirements'?

Question173: A Developer is asked to implement a caching layer in front of Amazon RDS. Cached content is expensive to regenerate in case of service failure. Which implementation below would work while maintaining maximum uptime?