AWS Developer and Deployment Theory: Facts and Summaries and Questions/Answers
AWS Developer – Deployment Theory Facts and summaries, Top 80 AWS Developer DVA-C02 Theory Questions and Answers Dump
Definition 1: The AWS Developer is responsible for designing, deploying, and developing cloud applications on AWS platform
Definition 2: The AWS Developer Tools is a set of services designed to enable developers and IT operations professionals practicing DevOps to rapidly and safely deliver software.
The AWS Certified Developer Associate certification is a widely recognized certification that validates a candidate’s expertise in developing and maintaining applications on the Amazon Web Services (AWS) platform.
The certification is about to undergo a major change with the introduction of the new exam version DVA-C02, replacing the current DVA-C01. In this article, we will discuss the differences between the two exams and what candidates should consider in terms of preparation for the new DVA-C02 exam.
Quick facts
- What’s happening?
- The DVA-C01 exam is being replaced by the DVA-C02 exam.
- When is this taking place?
- The last day to take the current exam is February 27th, 2023 and the first day to take the new exam is February 28th, 2023.
- What’s the difference?
- The new exam features some new AWS services and features.
Main differences between DVA-C01 and DVA-C02
The table below details the differences between the DVA-C01 and DVA-C02 exams domains and weightings:
In terms of the exam content weightings, the DVA-C02 exam places a greater emphasis on deployment and management, with a slightly reduced emphasis on development and refactoring. This shift reflects the increased importance of operations and management in cloud computing, as well as the need for developers to have a strong understanding of how to deploy and maintain applications on the AWS platform.
One major difference between the two exams is the focus on the latest AWS services and features. The DVA-C02 exam covers around 57 services vs only 33 services in the DVA-C01. This reflects the rapidly evolving AWS ecosystem and the need for developers to be up-to-date with the latest services and features in order to effectively build and maintain applications on the platform.
Click the image above to watch our video about the NEW AWS Developer Associate Exam DVA-C02 from our youtube channel
Training resources for the AWS Developer Associate
In terms of preparation for the DVA-C02 exam, we strongly recommend enrolling in our on-demand training courses for the AWS Developer Associate certification. It is important for candidates to familiarize themselves with the latest AWS services and features, as well as the updated exam content weightings. Practical experience working with AWS services and hands-on experimentation with new services and features will be key to success on the exam. Candidates should also focus on their understanding of security best practices, access control, and compliance, as these topics will carry a greater weight in the new exam.
Frequently asked questions – FAQs:
In conclusion, the change from the DVA-C01 to the DVA-C02 exam represents a major shift in the focus and content of the AWS Certified Developer Associate certification. Candidates preparing for the new exam should focus on familiarizing themselves with the latest AWS services and features, as well as the updated exam content weightings, and placing a strong emphasis on security, governance, and compliance.
With the right preparation and focus, candidates can successfully navigate the changes in the DVA-C02 exam and maintain their status as a certified AWS Developer Associate.
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AWS Developer and Deployment Theory Facts and summaries
- Continuous Integration is about integrating or merging the code changes frequently, at least once per day. It enables multiple devs to work on the same application.
- Continuous delivery is all about automating the build, test, and deployment functions.
- Continuous Deployment fully automates the entire release process, code is deployed into Production as soon as it has successfully passed through the release pipeline.
- AWS CodePipeline is a continuous integration/Continuous delivery service:
- It automates your end-to-end software release process based on user defines workflow
- It can be configured to automatically trigger your pipeline as soon as a change is detected in your source code repository
- It integrates with other services from AWS like CodeBuild and CodeDeploy, as well as third party custom plug-ins.
- AWS CodeBuild is a fully managed build service. It can build source code, run tests and produce software packages based on commands that you define yourself.
- Dy default the buildspec.yml defines the build commands and settings used by CodeBuild to run your build.
- AWS CodeDeploy is a fully managed automated deployment service and can be used as part of a Continuous Delivery or Continuous Deployment process.
- There are 2 types of deployment approach:
- In-place or Rolling update- you stop the application on each host and deploy the latest code. EC2 and on premise systems only. To roll back, you must re-deploy the previous version of the application.
- Blue/Green : New instances are provisioned and the new application is deployed to these new instances. Traffic is routed to the new instances according to your own schedule. Supported for EC2, on-premise systems and Lambda functions. Rollback is easy, just route the traffic back to the original instances. Blue is active deployment, green is new release.
- Docker allows you to package your software into Containers which you can run in Elastic Container Service (ECS)
- A docker Container includes everything the software needs to run including code, libraries, runtime and environment variables etc..
- A special file called Dockerfile is used to specify the instructions needed to assemble your Docker image.
- Once built, Docker images can be stored in Elastic Container Registry (ECR) and ECS can then use the image to launch Docker Containers.
- AWS CodeCommit is based on Git. It provides centralized repositories for all your code, binaries, images, and libraries.
- CodeCommit tracks and manages code changes. It maintains version history.
- CodeCommit manages updates from multiple sources and enables collaboration.
- To support CORS, API resource needs to implement an OPTIONS method that can respond to the OPTIONS preflight request with following headers:
- You have a legacy application that works via XML messages. You need to place the application behind the API gateway in order for customers to make API calls. Which of the following would you need to configure?
You will need to work with the Request and Response Data mapping. - Your application currently points to several Lambda functions in AWS. A change is being made to one of the Lambda functions. You need to ensure that application traffic is shifted slowly from one Lambda function to the other. Which of the following steps would you carry out?
- Create an ALIAS with the –routing-config parameter
- Update the ALIAS with the –routing-config parameter
- AWS CodeDeploy: The AppSpec file defines all the parameters needed for the deployment e.g. location of application files and pre/post deployment validation tests to run.
- For Ec2 / On Premise systems, the appspec.yml file must be placed in the root directory of your revision (the same folder that contains your application code). Written in YAML.
- For Lambda and ECS deployment, the AppSpec file can be YAML or JSON
- Visual workflows are automatically created when working with which Step Functions
- API Gateway stages store configuration for deployment. An API Gateway Stage refers to A snapshot of your API
- AWS SWF Services SWF guarantees delivery order of messages/tasks
- Blue/Green Deployments with CodeDeploy on AWS Lambda can happen in multiple ways. Which of these is a potential option? Linear, All at once, Canary
- X-Ray Filter Expressions allow you to search through request information using characteristics like URL Paths, Trace ID, Annotations
- S3 has eventual consistency for overwrite PUTS and DELETES.
- What can you do to ensure the most recent version of your Lambda functions is in CodeDeploy?
Specify the version to be deployed in AppSpec file.
Top
Reference: AWS Developer Tools
AWS Developer and Deployment Theory: Top 80 Questions and Answers Dump
Q0: Which AWS service can be used to compile source code, run tests and package code?
- A. CodePipeline
- B. CodeCommit
- C. CodeBuild
- D. CodeDeploy
TopQ1: How can your prevent CloudFormation from deleting your entire stack on failure? (Choose 2)
- A. Set the Rollback on failure radio button to No in the CloudFormation console
- B. Set Termination Protection to Enabled in the CloudFormation console
- C. Use the –disable-rollback flag with the AWS CLI
- D. Use the –enable-termination-protection protection flag with the AWS CLI
Q2: Which of the following practices allows multiple developers working on the same application to merge code changes frequently, without impacting each other and enables the identification of bugs early on in the release process?
- A. Continuous Integration
- B. Continuous Deployment
- C. Continuous Delivery
- D. Continuous Development
Q3: When deploying application code to EC2, the AppSpec file can be written in which language?
- A. JSON
- B. JSON or YAML
- C. XML
- D. YAML
Q4: Part of your CloudFormation deployment fails due to a mis-configuration, by defaukt what will happen?
- A. CloudFormation will rollback only the failed components
- B. CloudFormation will rollback the entire stack
- C. Failed component will remain available for debugging purposes
- D. CloudFormation will ask you if you want to continue with the deployment
Q5: You want to receive an email whenever a user pushes code to CodeCommit repository, how can you configure this?
- A. Create a new SNS topic and configure it to poll for CodeCommit eveents. Ask all users to subscribe to the topic to receive notifications
- B. Configure a CloudWatch Events rule to send a message to SES which will trigger an email to be sent whenever a user pushes code to the repository.
- C. Configure Notifications in the console, this will create a CloudWatch events rule to send a notification to a SNS topic which will trigger an email to be sent to the user.
- D. Configure a CloudWatch Events rule to send a message to SQS which will trigger an email to be sent whenever a user pushes code to the repository.
Q6: Which AWS service can be used to centrally store and version control your application source code, binaries and libraries
- A. CodeCommit
- B. CodeBuild
- C. CodePipeline
- D. ElasticFileSystem
Q7: You are using CloudFormation to create a new S3 bucket,
which of the following sections would you use to define the properties of your bucket?- A. Conditions
- B. Parameters
- C. Outputs
- D. Resources
Q8: You are deploying a number of EC2 and RDS instances using CloudFormation. Which section of the CloudFormation template
would you use to define these?
- A. Transforms
- B. Outputs
- C. Resources
- D. Instances
Q9: Which AWS service can be used to fully automate your entire release process?
- A. CodeDeploy
- B. CodePipeline
- C. CodeCommit
- D. CodeBuild
Q10: You want to use the output of your CloudFormation stack as input to another CloudFormation stack. Which sections of the CloudFormation template would you use to help you configure this?
- A. Outputs
- B. Transforms
- C. Resources
- D. Exports
Q11: You have some code located in an S3 bucket that you want to reference in your CloudFormation template. Which section of the template can you use to define this?
- A. Inputs
- B. Resources
- C. Transforms
- D. Files
Q12: You are deploying an application to a number of Ec2 instances using CodeDeploy. What is the name of the file
used to specify source files and lifecycle hooks?
- A. buildspec.yml
- B. appspec.json
- C. appspec.yml
- D. buildspec.json
Q13: Which of the following approaches allows you to re-use pieces of CloudFormation code in multiple templates, for common use cases like provisioning a load balancer or web server?
- A. Share the code using an EBS volume
- B. Copy and paste the code into the template each time you need to use it
- C. Use a cloudformation nested stack
- D. Store the code you want to re-use in an AMI and reference the AMI from within your CloudFormation template.
Q14: In the CodeDeploy AppSpec file, what are hooks used for?
- A. To reference AWS resources that will be used during the deployment
- B. Hooks are reserved for future use
- C. To specify files you want to copy during the deployment.
- D. To specify, scripts or function that you want to run at set points in the deployment lifecycle
Q15:You need to setup a RESTful API service in AWS that would be serviced via the following url https://democompany.com/customers Which of the following combination of services can be used for development and hosting of the RESTful service? Choose 2 answers from the options below
- A. AWS Lambda and AWS API gateway
- B. AWS S3 and Cloudfront
- C. AWS EC2 and AWS Elastic Load Balancer
- D. AWS SQS and Cloudfront
Q16: As a developer, you have created a Lambda function that is used to work with a bucket in Amazon S3. The Lambda function is not working as expected. You need to debug the issue and understand what’s the underlying issue. How can you accomplish this in an easily understandable way?
- A. Use AWS Cloudwatch metrics
- B. Put logging statements in your code
- C. Set the Lambda function debugging level to verbose
- D. Use AWS Cloudtrail logs
Q17: You have a lambda function that is processed asynchronously. You need a way to check and debug issues if the function fails? How could you accomplish this?
- A. Use AWS Cloudwatch metrics
- B. Assign a dead letter queue
- C. Congure SNS notications
- D. Use AWS Cloudtrail logs
Q18: You are developing an application that is going to make use of Amazon Kinesis. Due to the high throughput , you decide to have multiple shards for the streams. Which of the following is TRUE when it comes to processing data across multiple shards?
- A. You cannot guarantee the order of data across multiple shards. Its possible only within a shard
- B. Order of data is possible across all shards in a streams
- C. Order of data is not possible at all in Kinesis streams
- D. You need to use Kinesis firehose to guarantee the order of data
Q19: You’ve developed a Lambda function and are now in the process of debugging it. You add the necessary print statements in the code to assist in the debugging. You go to Cloudwatch logs , but you see no logs for the lambda function. Which of the following could be the underlying issue for this?
- A. You’ve not enabled versioning for the Lambda function
- B. The IAM Role assigned to the Lambda function does not have the necessary permission to create Logs
- C. There is not enough memory assigned to the function
- D. There is not enough time assigned to the function
Q20: Your application is developed to pick up metrics from several servers and push them off to Cloudwatch. At times , the application gets client 429 errors. Which of the following can be done from the programming side to resolve such errors?
- A. Use the AWS CLI instead of the SDK to push the metrics
- B. Ensure that all metrics have a timestamp before sending them across
- C. Use exponential backoff in your request
- D. Enable encryption for the requests
Q21: You have been instructed to use the CodePipeline service for the CI/CD automation in your company. Due to security reasons , the resources that would be part of the deployment are placed in another account. Which of the following steps need to be carried out to accomplish this deployment? Choose 2 answers from the options given below
- A. Dene a customer master key in KMS
- B. Create a reference Code Pipeline instance in the other account
- C. Add a cross account role
- D. Embed the access keys in the codepipeline process
Q22: You are planning on deploying an application to the worker role in Elastic Beanstalk. Moreover, this worker application is going to run the periodic tasks. Which of the following is a must have as part of the deployment?
- A. An appspec.yaml file
- B. A cron.yaml file
- C. A cron.cong file
- D. An appspec.json file
Q23: An application needs to make use of an SQS queue for working with messages. An SQS queue has been created with the default settings. The application needs 60 seconds to process each message. Which of the following step need to be carried out by the application.
- A. Change the VisibilityTimeout for each message and then delete the message after processing is completed
- B. Delete the message and change the visibility timeout.
- C. Process the message , change the visibility timeout. Delete the message
- D. Process the message and delete the message
Q24: AWS CodeDeploy deployment fails to start & generate following error code, ”HEALTH_CONSTRAINTS_INVALID”, Which of the following can be used to eliminate this error?
- A. Make sure the minimum number of healthy instances is equal to the total number of instances in the deployment group.
- B. Increase the number of healthy instances required during deployment
- C. Reduce number of healthy instances required during deployment
- D. Make sure the number of healthy instances is equal to the specified minimum number of healthy instances.
Q25: How are the state machines in AWS Step Functions defined?
- A. SAML
- B. XML
- C. YAML
- D. JSON
Q26:How can API Gateway methods be configured to respond to requests?
- A. Forwarded to method handlers
- B. AWS Lambda
- C. Integrated with other AWS Services
- D. Existing HTTP endpoints
Q27: Which of the following could be an example of an API Gateway Resource URL for a trucks resource?
- A. https://1a2sb3c4.execute-api.us-east-1.awsapigateway.com/trucks
- B. https://trucks.1a2sb3c4.execute-api.us-east-1.amazonaws.com
- C. https://1a2sb3c4.execute-api.amazonaws.com/trucks
- D. https://1a2sb3c4.execute-api.us-east-1.amazonaws.com/cars
Q28: API Gateway Deployments are:
- A. A specific snapshot of your API’s methods
- B. A specific snapshot of all of your API’s settings, resources, and methods
- C. A specific snapshot of your API’s resources
- D. A specific snapshot of your API’s resources and methods
Q29: A SWF workflow task or task execution can live up to how long?
- A. 1 Year
- B. 14 days
- C. 24 hours
- D. 3 days
Q30: With AWS Step Functions, all the work in your state machine is done by tasks. These tasks performs work by using what types of things? (Choose the best 3 answers)
- A. An AWS Lambda Function Integration
- B. Passing parameters to API actions of other services
- C. Activities
- D. An EC2 Integration
Q31: How does SWF make decisions?
- A. A decider program that is written in the language of the developer’s choice
- B. A visual workflow created in the SWF visual workflow editor
- C. A JSON-defined state machine that contains states within it to select the next step to take
- D. SWF outsources all decisions to human deciders through the AWS Mechanical Turk service.
Q32: In order to effectively build and test your code, AWS CodeBuild allows you to:
- A. Select and use some 3rd party providers to run tests against your code
- B. Select a pre-configured environment
- C. Provide your own custom AMI
- D. Provide your own custom container image
Q33: X-Ray Filter Expressions allow you to search through request information using characteristics like:
- A. URL Paths
- B. Metadata
- C. Trace ID
- D. Annotations
Q34: CodePipeline pipelines are workflows that deal with stages, actions, transitions, and artifacts. Which of the following statements is true about these concepts?
- A. Stages contain at least two actions
- B. Artifacts are never modified or iterated on when used inside of CodePipeline
- C. Stages contain at least one action
- D. Actions will have a deployment artifact as either an input an output or both
Q35: When deploying a simple Python web application with Elastic Beanstalk which of the following AWS resources will be created and managed for you by Elastic Beanstalk?
- A. An Elastic Load Balancer
- B. An S3 Bucket
- C. A Lambda Function
- D. An EC2 instance
Q36: Elastic Beanstalk is used to:
- A. Deploy and scale web applications and services developed with a supported platform
- B. Deploy and scale serverless applications
- C. Deploy and scale applications based purely on EC2 instances
- D. Manage the deployment of all AWS infrastructure resources of your AWS applications
Q35: How can AWS X-Ray determine what data to collect?
- A. X-Ray applies a sampling algorithm by default
- B. X-Ray collects data on all requests by default
- C. You can implement your own sampling frequencies for data collection
- D. X-Ray collects data on all requests for services enabled with it
Q37: Which API call is used to list all resources that belong to a CloudFormation Stack?
- A. DescribeStacks
- B. GetTemplate
- C. DescribeStackResources
- D. ListStackResources
Q38: What is the default behaviour of a CloudFormation stack if the creation of one resource fails?
- A. Rollback
- B. The stack continues creating and the failed resource is ignored
- C. Delete
- D. Undo
Q39: Which AWS CLI command lists all current stacks in your CloudFormation service?
- A. aws cloudformation describe-stacks
- B. aws cloudformation list-stacks
- C. aws cloudformation create-stack
- D. aws cloudformation describe-stack-resources
Q40:
Which API call is used to list all resources that belong to a CloudFormation Stack?
- A. DescribeStacks
- B. GetTemplate
- C. ListStackResources
- D. DescribeStackResources
Q41: How does using ElastiCache help to improve database performance?
- A. It can store petabytes of data
- B. It provides faster internet speeds
- C. It can store the results of frequent or highly-taxing queries
- D. It uses read replicas
Q42: Which of the following best describes the Lazy Loading caching strategy?
- A. Every time the underlying database is written to or updated the cache is updated with the new information.
- B. Every miss to the cache is counted and when a specific number is reached a full copy of the database is migrated to the cache
- C. A specific amount of time is set before the data in the cache is marked as expired. After expiration, a request for expired data will be made through to the backing database.
- D. Data is added to the cache when a cache miss occurs (when there is no data in the cache and the request must go to the database for that data)
Q43: What are two benefits of using RDS read replicas?
- A. You can add/remove read replicas based on demand, so it creates elasticity for RDS.
- B. Improves performance of the primary database by taking workload from it
- C. Automatic failover in the case of Availability Zone service failures
- D. Allows both reads and writes
Q44: What is the simplest way to enable an S3 bucket to be able to send messages to your SNS topic?
- A. Attach an IAM role to the S3 bucket to send messages to SNS.
- B. Activate the S3 pipeline feature to send notifications to another AWS service – in this case select SNS.
- C. Add a resource-based access control policy on the SNS topic.
- D. Use AWS Lambda to receive events from the S3 bucket and then use the Publish API action to send them to the SNS topic.
Q45: You have just set up a push notification service to send a message to an app installed on a device with the Apple Push Notification Service. It seems to work fine. You now want to send a message to an app installed on devices for multiple platforms, those being the Apple Push Notification Service(APNS) and Google Cloud Messaging for Android (GCM). What do you need to do first for this to be successful?
- A. Request Credentials from Mobile Platforms, so that each device has the correct access control policies to access the SNS publisher
- B. Create a Platform Application Object which will connect all of the mobile devices with your app to the correct SNS topic.
- C. Request a Token from Mobile Platforms, so that each device has the correct access control policies to access the SNS publisher.
- D. Get a set of credentials in order to be able to connect to the push notification service you are trying to setup.
Q46: SNS message can be sent to different kinds of endpoints. Which of these is NOT currently a supported endpoint?
- A. Slack Messages
- B. SMS (text message)
- C. HTTP/HTTPS
- D. AWS Lambda
Q47: Company B provides an online image recognition service and utilizes SQS to decouple system components for scalability. The SQS consumers poll the imaging queue as often as possible to keep end-to-end throughput as high as possible. However, Company B is realizing that polling in tight loops is burning CPU cycles and increasing costs with empty responses. How can Company B reduce the number empty responses?
- A. Set the imaging queue VisibilityTimeout attribute to 20 seconds
- B. Set the imaging queue MessageRetentionPeriod attribute to 20 seconds
- C. Set the imaging queue ReceiveMessageWaitTimeSeconds Attribute to 20 seconds
- D. Set the DelaySeconds parameter of a message to 20 seconds
Q48: Which of the following statements about SQS standard queues are true?
- A. Message order can be indeterminate – you’re not guaranteed to get messages in the same order they were sent in
- B. Messages will be delivered exactly once and messages will be delivered in First in, First out order
- C. Messages will be delivered exactly once and message delivery order is indeterminate
- D. Messages can be delivered one or more times
Q49: Which of the following is true if long polling is enabled?
- A. If long polling is enabled, then each poll only polls a subset of SQS servers; in order for all messages to be received, polling must continuously occur
- B. The reader will listen to the queue until timeout
- C. Increases costs because each request lasts longer
- D. The reader will listen to the queue until a message is available or until timeout
Q50: When dealing with session state in EC2-based applications using Elastic load balancers which option is generally thought of as the best practice for managing user sessions?
- A. Having the ELB distribute traffic to all EC2 instances and then having the instance check a caching solution like ElastiCache running Redis or Memcached for session information
- B. Permanently assigning users to specific instances and always routing their traffic to those instances
- C. Using Application-generated cookies to tie a user session to a particular instance for the cookie duration
- D. Using Elastic Load Balancer generated cookies to tie a user session to a particular instance
Q51: When requested through an STS API call, credentials are returned with what three components?
- A. Security Token, Access Key ID, Signed URL
- B. Security Token, Access Key ID, Secret Access Key
- C. Signed URL, Security Token, Username
- D. Security Token, Secret Access Key, Personal Pin Code
Q52: Your application must write to an SQS queue. Your corporate security policies require that AWS credentials are always encrypted and are rotated at least once a week.
How can you securely provide credentials that allow your application to write to the queue?- A. Have the application fetch an access key from an Amazon S3 bucket at run time.
- B. Launch the application’s Amazon EC2 instance with an IAM role.
- C. Encrypt an access key in the application source code.
- D. Enroll the instance in an Active Directory domain and use AD authentication.
TopQ53: Your web application reads an item from your DynamoDB table, changes an attribute, and then writes the item back to the table. You need to ensure that one process doesn’t overwrite a simultaneous change from another process.
How can you ensure concurrency?- A. Implement optimistic concurrency by using a conditional write.
- B. Implement pessimistic concurrency by using a conditional write.
- C. Implement optimistic concurrency by locking the item upon read.
- D. Implement pessimistic concurrency by locking the item upon read.
TopQ54: Which statements about DynamoDB are true? Choose 2 answers
- A. DynamoDB uses optimistic concurrency control
- B. DynamoDB restricts item access during writes
- C. DynamoDB uses a pessimistic locking model
- D. DynamoDB restricts item access during reads
- E. DynamoDB uses conditional writes for consistency
TopQ55: Your CloudFormation template has the following Mappings section:
Which JSON snippet will result in the value “ami-6411e20d” when a stack is launched in us-east-1?
- A. { “Fn::FindInMap” : [ “Mappings”, { “RegionMap” : [“us-east-1”, “us-west-1”] }, “32”]}
- B. { “Fn::FindInMap” : [ “Mappings”, { “Ref” : “AWS::Region” }, “32”]}
- C. { “Fn::FindInMap” : [ “RegionMap”, { “Ref” : “AWS::Region” }, “32”]}
- D. { “Fn::FindInMap” : [ “RegionMap”, { “RegionMap” : “AWS::Region” }, “32”]}
TopQ56: Your application triggers events that must be delivered to all your partners. The exact partner list is constantly changing: some partners run a highly available endpoint, and other partners’ endpoints are online only a few hours each night. Your application is mission-critical, and communication with your partners must not introduce delay in its operation. A delay in delivering the event to one partner cannot delay delivery to other partners.
What is an appropriate way to code this?
- A. Implement an Amazon SWF task to deliver the message to each partner. Initiate an Amazon SWF workflow execution.
- B. Send the event as an Amazon SNS message. Instruct your partners to create an HTTP. Subscribe their HTTP endpoint to the Amazon SNS topic.
- C. Create one SQS queue per partner. Iterate through the queues and write the event to each one. Partners retrieve messages from their queue.
- D. Send the event as an Amazon SNS message. Create one SQS queue per partner that subscribes to the Amazon SNS topic. Partners retrieve messages from their queue.
Q57: You have a three-tier web application (web, app, and data) in a single Amazon VPC. The web and app tiers each span two Availability Zones, are in separate subnets, and sit behind ELB Classic Load Balancers. The data tier is a Multi-AZ Amazon RDS MySQL database instance in database subnets.
When you call the database tier from your app tier instances, you receive a timeout error. What could be causing this?- A. The IAM role associated with the app tier instances does not have rights to the MySQL database.
- B. The security group for the Amazon RDS instance does not allow traffic on port 3306 from the app
instances. - C. The Amazon RDS database instance does not have a public IP address.
- D. There is no route defined between the app tier and the database tier in the Amazon VPC.
Q58: What type of block cipher does Amazon S3 offer for server side encryption?
- A. RC5
- B. Blowfish
- C. Triple DES
- D. Advanced Encryption Standard
Q59: You have written an application that uses the Elastic Load Balancing service to spread
traffic to several web servers Your users complain that they are sometimes forced to login
again in the middle of using your application, after they have already togged in. This is not
behaviour you have designed. What is a possible solution to prevent this happening?- A. Use instance memory to save session state.
- B. Use instance storage to save session state.
- C. Use EBS to save session state
- D. Use ElastiCache to save session state.
- E. Use Glacier to save session slate.
Q60: You are writing to a DynamoDB table and receive the following exception:”
ProvisionedThroughputExceededException”. though according to your Cloudwatch metrics
for the table, you are not exceeding your provisioned throughput. What could be an
explanation for this?- A. You haven’t provisioned enough DynamoDB storage instances
- B. You’re exceeding your capacity on a particular Range Key
- C. You’re exceeding your capacity on a particular Hash Key
- D. You’re exceeding your capacity on a particular Sort Key
- E. You haven’t configured DynamoDB Auto Scaling triggers
Q61: Which DynamoDB limits can be raised by contacting AWS support?
- A. The number of hash keys per account
- B. The maximum storage used per account
- C. The number of tables per account
- D. The number of local secondary indexes per account
- E. The number of provisioned throughput units per account
TopQ62: AWS CodeBuild allows you to compile your source code, run unit tests, and produce deployment artifacts by:
- A. Allowing you to provide an Amazon Machine Image to take these actions within
- B. Allowing you to select an Amazon Machine Image and provide a User Data bootstrapping script to prepare an instance to take these actions within
- C. Allowing you to provide a container image to take these actions within
- D. Allowing you to select from pre-configured environments to take these actions within
TopQ63: Which of the following will not cause a CloudFormation stack deployment to rollback?
- A. The template contains invalid JSON syntax
- B. An AMI specified in the template exists in a different region than the one in which the stack is being deployed.
- C. A subnet specified in the template does not exist
- D. The template specifies an instance-store backed AMI and an incompatible EC2 instance type.
TopQ64: Your team is using CodeDeploy to deploy an application which uses secure parameters that are stored in the AWS System Mangers Parameter Store. What two options below must be completed so CodeDeploy can deploy the application?
- A. Use ssm get-parameters with –with-decryption option
- B. Add permissions using AWS access keys
- C. Add permissions using AWS IAM role
- D. Use ssm get-parameters with –with-no-decryption option
TopQ65: A corporate web application is deployed within an Amazon VPC, and is connected to the corporate data center via IPSec VPN. The application must authenticate against the on-premise LDAP server. Once authenticated, logged-in users can only access an S3 keyspace specific to the user. Which of the solutions below meet these requirements? Choose two answers How would you authenticate to the application given these details? (Choose 2)
- A. The application authenticates against LDAP, and retrieves the name of an IAM role associated with the user. The application then calls the IAM Security Token Service to assume that IAM Role. The application can use the temporary credentials to access the S3 keyspace.
- B. Develop an identity broker which authenticates against LDAP, and then calls IAM Security Token Service to get IAM federated user credentials. The application calls the identity broker to get IAM federated user credentials with access to the appropriate S3 keyspace
- C. Develop an identity broker which authenticates against IAM Security Token Service to assume an IAM Role to get temporary AWS security credentials. The application calls the identity broker to get AWS temporary security credentials with access to the app
- D. The application authenticates against LDAP. The application then calls the IAM Security Service to login to IAM using the LDAP credentials. The application can use the IAM temporary credentials to access the appropriate S3 bucket.
TopQ66:
A corporate web application is deployed within an Amazon VPC, and is connected to the corporate data center via IPSec VPN. The application must authenticate against the on-premise LDAP server. Once authenticated, logged-in users can only access an S3 keyspace specific to the user. Which of the solutions below meet these requirements? Choose two answers
How would you authenticate to the application given these details? (Choose 2)- A. The application authenticates against LDAP, and retrieves the name of an IAM role associated with the user. The application then calls the IAM Security Token Service to assume that IAM Role. The application can use the temporary credentials to access the S3 keyspace.
- B. Develop an identity broker which authenticates against LDAP, and then calls IAM Security Token Service to get IAM federated user credentials. The application calls the identity broker to get IAM federated user credentials with access to the appropriate S3 keyspace
- C. Develop an identity broker which authenticates against IAM Security Token Service to assume an IAM Role to get temporary AWS security credentials. The application calls the identity broker to get AWS temporary security credentials with access to the app
- D. The application authenticates against LDAP. The application then calls the IAM Security Service to login to IAM using the LDAP credentials. The application can use the IAM temporary credentials to access the appropriate S3 bucket.
TopQ67: When users are signing in to your application using Cognito, what do you need to do to make sure if the user has compromised credentials, they must enter a new password?
- A. Create a user pool in Cognito
- B. Block use for “Compromised credential” in the Basic security section
- C. Block use for “Compromised credential” in the Advanced security section
- D. Use secure remote password
Q68: You work in a large enterprise that is currently evaluating options to migrate your 27 GB Subversion code base. Which of the following options is the best choice for your organization?
- A. AWS CodeHost
- B. AWS CodeCommit
- C. AWS CodeStart
- D. None of these
Q69: You are on a development team and you need to migrate your Spring Application over to AWS. Your team is looking to build, modify, and test new versions of the application. What AWS services could help you migrate your app?
- A. Elastic Beanstalk
- B. SQS
- C. Ec2
- D. AWS CodeDeploy
Q70:
You are a developer responsible for managing a high volume API running in your company’s datacenter. You have been asked to implement a similar API, but one that has potentially higher volume. And you must do it in the most cost effective way, using as few services and components as possible. The API stores and fetches data from a key value store. Which services could you utilize in AWS?- A. DynamoDB
- B. Lambda
- C. API Gateway
- D. EC2
Q71: By default, what event occurs if your CloudFormation receives an error during creation?
- A. DELETE_IN_PROGRESS
- B. CREATION_IN_PROGRESS
- C. DELETE_COMPLETE
- D. ROLLBACK_IN_PROGRESS
TopQ72:
AWS X-Ray was recently implemented inside of a service that you work on. Several weeks later, after a new marketing push, that service started seeing a large spike in traffic and you’ve been tasked with investigating a few issues that have started coming up but when you review the X-Ray data you can’t find enough information to draw conclusions so you decide to:- A. Start passing in the X-Amzn-Trace-Id: True HTTP header from your upstream requests
- B. Refactor the service to include additional calls to the X-Ray API using an AWS SDK
- C. Update the sampling algorithm to increase the sample rate and instrument X-Ray to collect more pertinent information
- D. Update your application to use the custom API Gateway TRACE method to send in data
Q74: X-Ray metadata:
- A. Associates request data with a particular Trace-ID
- B. Stores key-value pairs of any type that are not searchable
- C. Collects at the service layer to provide information on the overall health of the system
- D. Stores key-value pairs of searchable information
TopQ75: Which of the following is the right sequence that gets called in CodeDeploy when you use Lambda hooks in an EC2/On-Premise Deployment?
- A. Before Install-AfterInstall-Validate Service-Application Start
- B. Before Install-After-Install-Application Stop-Application Start
- C. Before Install-Application Stop-Validate Service-Application Start
- D. Application Stop-Before Install-After Install-Application Start
Q76:
Describe the process of registering a mobile device with SNS push notification service using GCM.- A. Receive Registration ID and token for each mobile device. Then, register the mobile application with Amazon SNS, and pass the GCM token credentials to Amazon SNS
- B. Pass device token to SNS to create mobile subscription endpoint for each mobile device, then request the device token from each mobile device. SNS then communicates on your behalf to the GCM service
- C. None of these are correct
- D. Submit GCM notification credentials to Amazon SNS, then receive the Registration ID for each mobile device. After that, pass the device token to SNS, and SNS then creates a mobile subscription endpoint for each device and communicates with the GCM service on your behalf
Q77:
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?- A. Store photos on an EBS volume of the web server.
- B. Block the IPs of the offending websites in Security Groups.
- C. Remove public read access and use signed URLs with expiry dates.
- D. Use CloudFront distributions for static content.
Q78: How can you control access to the API Gateway in your environment?
- A. Cognito User Pools
- B. Lambda Authorizers
- C. API Methods
- D. API Stages
Q79: What kind of message does SNS send to endpoints?
- A. An XML document with parameters like Message, Source, Destination, Type
- B. A JSON document with parameters like Message, Signature, Subject, Type.
- C. An XML document with parameters like Message, Signature, Subject, Type
- D. A JSON document with parameters like Message, Source, Destination, Type
Q80: Company B provides an online image recognition service and utilizes SQS to decouple system components for scalability. The SQS consumers poll the imaging queue as often as possible to keep end-to-end throughput as high as possible. However, Company B is realizing that polling in tight loops is burning CPU cycles and increasing costs with empty responses. How can Company B reduce the number of empty responses?
- A. Set the imaging queue MessageRetentionPeriod attribute to 20 seconds.
- B. Set the imaging queue ReceiveMessageWaitTimeSeconds attribute to 20 seconds.
- C. Set the imaging queue VisibilityTimeout attribute to 20 seconds.
- D. Set the DelaySeconds parameter of a message to 20 seconds.
Top81: You’re using CloudFormation templates to build out staging environments. What section of the CloudFormation would you edit in order to allow the user to specify the PEM key-name at start time?
- A. Resources Section
- B. Parameters Section
- C. Mappings Section
- D. Declaration Section
TopQ82: You are writing an AWS CloudFormation template and you want to assign values to properties that will not be available until runtime. You know that you can use intrinsic functions to do this but are unsure as to which part of the template they can be used in. Which of the following is correct in describing how you can currently use intrinsic functions in an AWS CloudFormation template?
- A. You can use intrinsic functions in any part of a template, except AWSTemplateFormatVersion and Description
- B. You can use intrinsic functions in any part of a template.
- C. You can use intrinsic functions only in the resource properties part of a template.
- D. You can only use intrinsic functions in specific parts of a template. You can use intrinsic functions in resource properties, metadata attributes, and update policy attributes.
Top
Other AWS Facts and Summaries and Questions/Answers Dump
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List of Freely available programming books - What is the single most influential book every Programmers should read
- Bjarne Stroustrup - The C++ Programming Language
- Brian W. Kernighan, Rob Pike - The Practice of Programming
- Donald Knuth - The Art of Computer Programming
- Ellen Ullman - Close to the Machine
- Ellis Horowitz - Fundamentals of Computer Algorithms
- Eric Raymond - The Art of Unix Programming
- Gerald M. Weinberg - The Psychology of Computer Programming
- James Gosling - The Java Programming Language
- Joel Spolsky - The Best Software Writing I
- Keith Curtis - After the Software Wars
- Richard M. Stallman - Free Software, Free Society
- Richard P. Gabriel - Patterns of Software
- Richard P. Gabriel - Innovation Happens Elsewhere
- Code Complete (2nd edition) by Steve McConnell
- The Pragmatic Programmer
- Structure and Interpretation of Computer Programs
- The C Programming Language by Kernighan and Ritchie
- Introduction to Algorithms by Cormen, Leiserson, Rivest & Stein
- Design Patterns by the Gang of Four
- Refactoring: Improving the Design of Existing Code
- The Mythical Man Month
- The Art of Computer Programming by Donald Knuth
- Compilers: Principles, Techniques and Tools by Alfred V. Aho, Ravi Sethi and Jeffrey D. Ullman
- Gödel, Escher, Bach by Douglas Hofstadter
- Clean Code: A Handbook of Agile Software Craftsmanship by Robert C. Martin
- Effective C++
- More Effective C++
- CODE by Charles Petzold
- Programming Pearls by Jon Bentley
- Working Effectively with Legacy Code by Michael C. Feathers
- Peopleware by Demarco and Lister
- Coders at Work by Peter Seibel
- Surely You're Joking, Mr. Feynman!
- Effective Java 2nd edition
- Patterns of Enterprise Application Architecture by Martin Fowler
- The Little Schemer
- The Seasoned Schemer
- Why's (Poignant) Guide to Ruby
- The Inmates Are Running The Asylum: Why High Tech Products Drive Us Crazy and How to Restore the Sanity
- The Art of Unix Programming
- Test-Driven Development: By Example by Kent Beck
- Practices of an Agile Developer
- Don't Make Me Think
- Agile Software Development, Principles, Patterns, and Practices by Robert C. Martin
- Domain Driven Designs by Eric Evans
- The Design of Everyday Things by Donald Norman
- Modern C++ Design by Andrei Alexandrescu
- Best Software Writing I by Joel Spolsky
- The Practice of Programming by Kernighan and Pike
- Pragmatic Thinking and Learning: Refactor Your Wetware by Andy Hunt
- Software Estimation: Demystifying the Black Art by Steve McConnel
- The Passionate Programmer (My Job Went To India) by Chad Fowler
- Hackers: Heroes of the Computer Revolution
- Algorithms + Data Structures = Programs
- Writing Solid Code
- JavaScript - The Good Parts
- Getting Real by 37 Signals
- Foundations of Programming by Karl Seguin
- Computer Graphics: Principles and Practice in C (2nd Edition)
- Thinking in Java by Bruce Eckel
- The Elements of Computing Systems
- Refactoring to Patterns by Joshua Kerievsky
- Modern Operating Systems by Andrew S. Tanenbaum
- The Annotated Turing
- Things That Make Us Smart by Donald Norman
- The Timeless Way of Building by Christopher Alexander
- The Deadline: A Novel About Project Management by Tom DeMarco
- The C++ Programming Language (3rd edition) by Stroustrup
- Patterns of Enterprise Application Architecture
- Computer Systems - A Programmer's Perspective
- Agile Principles, Patterns, and Practices in C# by Robert C. Martin
- Growing Object-Oriented Software, Guided by Tests
- Framework Design Guidelines by Brad Abrams
- Object Thinking by Dr. David West
- Advanced Programming in the UNIX Environment by W. Richard Stevens
- Hackers and Painters: Big Ideas from the Computer Age
- The Soul of a New Machine by Tracy Kidder
- CLR via C# by Jeffrey Richter
- The Timeless Way of Building by Christopher Alexander
- Design Patterns in C# by Steve Metsker
- Alice in Wonderland by Lewis Carol
- Zen and the Art of Motorcycle Maintenance by Robert M. Pirsig
- About Face - The Essentials of Interaction Design
- Here Comes Everybody: The Power of Organizing Without Organizations by Clay Shirky
- The Tao of Programming
- Computational Beauty of Nature
- Writing Solid Code by Steve Maguire
- Philip and Alex's Guide to Web Publishing
- Object-Oriented Analysis and Design with Applications by Grady Booch
- Effective Java by Joshua Bloch
- Computability by N. J. Cutland
- Masterminds of Programming
- The Tao Te Ching
- The Productive Programmer
- The Art of Deception by Kevin Mitnick
- The Career Programmer: Guerilla Tactics for an Imperfect World by Christopher Duncan
- Paradigms of Artificial Intelligence Programming: Case studies in Common Lisp
- Masters of Doom
- Pragmatic Unit Testing in C# with NUnit by Andy Hunt and Dave Thomas with Matt Hargett
- How To Solve It by George Polya
- The Alchemist by Paulo Coelho
- Smalltalk-80: The Language and its Implementation
- Writing Secure Code (2nd Edition) by Michael Howard
- Introduction to Functional Programming by Philip Wadler and Richard Bird
- No Bugs! by David Thielen
- Rework by Jason Freid and DHH
- JUnit in Action
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Health Health, a science-based community to discuss human health
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Today I Learned (TIL) You learn something new every day; what did you learn today? Submit interesting and specific facts about something that you just found out here.
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- TIL that there is a species of whale that has been living in the oceans for millions of years, but it was only recently discovered due to its isolation in the deep depths.by /u/QuietKnightX on January 22, 2025 at 10:13 am
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- TIL In the Netherland a town exists that fully encloses 22 small exclaves of a Belgian town.by /u/Bangfis on January 22, 2025 at 10:08 am
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- TIL that a huge 20m (66ft) rogue wave hit the bulk carrier, MV Derbyshire with such force that it sent the ship underwater almost instantly, not even giving its crew enough time to save themselves, let alone send a distress signal.by /u/zahrul3 on January 22, 2025 at 9:10 am
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Reddit Science This community is a place to share and discuss new scientific research. Read about the latest advances in astronomy, biology, medicine, physics, social science, and more. Find and submit new publications and popular science coverage of current research.
- Black immigrants attract white residents to neighborhoods, while native Black residents move out, study finds.by /u/geoff199 on January 22, 2025 at 1:24 pm
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- Antibiotics, antivirals and vaccines could help tackle dementia, study suggests. Using drugs approved for other conditions could dramatically speed up hunt for cure, experts say.by /u/mvea on January 22, 2025 at 12:10 pm
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- Study links early emotional regulation difficulties to ADHD and conduct problems | The findings highlight the importance of early emotional development and could guide targeted support for children at risk.by /u/chrisdh79 on January 22, 2025 at 11:02 am
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- Researchers have discovered that proteins in the mollusk’s blood not only have bacteria-killing properties, raising the possibility of a new antibiotic, but also increase the effectiveness of some existing antibiotics.by /u/chrisdh79 on January 22, 2025 at 10:59 am
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- A new study highlights how scaling up COVID-19 testing in the USA saved an estimated 1.4 million lives and averted 7 million hospitalisations. It emphasises the vital role of rapid testing in reducing severe outcomes and preparing for future pandemics.by /u/calliope_kekule on January 22, 2025 at 10:22 am
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Reddit Sports Sports News and Highlights from the NFL, NBA, NHL, MLB, MLS, and leagues around the world.
- NFL news roundup: Saints rescheduling HC interviews due to severe weatherby /u/EvelynClede on January 22, 2025 at 7:33 am
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- 4 arrested in connection with burglary at Joe Burrow's houseby /u/Oldtimer_2 on January 22, 2025 at 4:01 am
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- Young collector nabs rare Paul Skenes card that could offer him a hefty haul in trade with Piratesby /u/Oldtimer_2 on January 22, 2025 at 12:16 am
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