AWS-Certified-Developer-Associate Exam - Amazon AWS Certified Developer Associate

NEW QUESTION 1
Does Amazon DynamoDB support both increment and decrement atomic operations?

• A. No, neither increment nor decrement operations.
• B. Only increment, since decrement are inherently impossible with DynamoDB's data model.
• C. Only decrement, since increment are inherently impossible with DynamoDB's data model.
• D. Yes, both increment and decrement operation

Answer: D

Explanation: Amazon DynamoDB supports increment and decrement atomic operations.
Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/APISummary.html

NEW QUESTION 2
How many types of block devices does Amazon EC2 support?

• A. 5
• B. 1
• C. 2
• D. 4

Answer: C

Explanation: Amazon EC2 supports 2 types of block devices. Reference:
http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html

NEW QUESTION 3
In DynamoDB, if you create a table and request 10 units of write capacity and 200 units of read capacity of provisioned throughput, how much would you be charged in US East (Northern Virginia) Region?

• A. $0.05 per hour
• B. $0.10 per hour
• C. $0.03 per hour
• D. $0.15 per hour

Answer: A

Explanation: To understand pricing in DynamoDB, consider the following example. If you create a table and request 10 units of write capacity and 200 units of read capacity of provisioned throughput, you would be charged:
$0.01 + (4 x $0.01) = $0.05 per hour
Reference: http://aws.amazon.com/dynamodb/pricing/

NEW QUESTION 4
In DynamoDB, what type of HTTP response codes indicate that a problem was found with the client request sent to the service?

• A. 5xx HTTP response code
• B. 200 HTTP response code
• C. 306 HTTP response code
• D. 4xx HTTP response code

Answer: D

NEW QUESTION 5
A user is running a MySQL RDS instance. The user will not use the DB for the next 3 months. How can the user save costs?

• A. Pause the RDS actMties from CLI until it is required in the future
• B. Stop the RDS instance
• C. Create a snapshot of RDS to launch in the future and terminate the instance now
• D. Change the instance size to micro

Answer: C

Explanation: The RDS instances unlike the AWS EBS backed instances cannot be stopped or paused. The user needs to take the final snapshot, terminate the instance and launch a new instance in the future from that snapshot
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.BackingUpAndRestoringAmazonR DSInstances.htmI

NEW QUESTION 6
When using Amazon SQS how much data can you store in a message?

• A. 8 KB
• B. 2 KB
• C. 16 KB
• D. 4 KB

Answer: A

Explanation: With Amazon SQS version 2008-01-01, the maximum message size for both SOAP and Query requests is 8KB.
If you need to send messages to the queue that are larger than 8 KB, AWS recommends that you split the information into separate messages. Alternatively, you could use Amazon S3 or Amazon Simp|eDB to hold the information and include the pointer to that information in the Amazon SQS message.
If you send a message that is larger than 8KB to the queue, you will receive a MessageTooLong error with HTTP code 400.
Reference: https://aws.amazon.com/items/1343?externaI|D=1343

NEW QUESTION 7
A user has created photo editing software and hosted it on EC2. The software accepts requests from the user about the photo format and resolution and sends a message to S3 to enhance the picture accordingly. Which of the below mentioned AWS services will help make a scalable software with the AWS infrastructure in this scenario?

• A. AWS Elastic Transcoder
• B. AWS Simple Notification Service
• C. AWS Simple Queue Service
• D. AWS Glacier

Answer: C

Explanation: Amazon Simple Queue Service (SQS) is a fast, reliable, scalable, and fully managed message queuing service. SQS provides a simple and cost-effective way to decouple the components of an application. The user can configure SQS, which will decouple the call between the EC2 application and S3. Thus, the application does not keep waiting for S3 to provide the data.
Reference: http://aws.amazon.com/sqs/faqs/

NEW QUESTION 8
A user is launching an AWS RDS with MySQL. Which of the below mentioned options allows the user to configure the INNODB engine parameters?

• A. Options group
• B. Engine parameters
• C. Parameter groups
• D. DB parameters

Answer: C

Explanation: With regard to RDS, the user can manage the configuration of a DB engine by using a DB parameter group. A DB parameter group contains engine configuration values that can be applied to one or more DB instances of the same instance type.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html

NEW QUESTION 9
You have been given a scope to deploy some AWS infrastructure for a large orgAMsation. The requirements are that you will have a lot of EC2 instances but may need to add more when the average utilization of your Amazon EC2 fileet is high and conversely remove them when CPU utilization is low. Which AWS services would be best to use to accomplish this?

• A. Amazon CIoudFront, Amazon CIoudWatch and Elastic Load Balancing.
• B. Auto Scaling, Amazon CIoudWatch and AWS CIoudTraiI.
• C. Auto Scaling, Amazon CIoudWatch and Elastic Load Balancing.
• D. Auto Scaling, Amazon CIoudWatch and AWS Elastic Beanstalk

Answer: C

Explanation: Auto Scaling enables you to follow the demand curve for your applications closely, reducing the need to manually provision Amazon EC2 capacity in advance. For example, you can set a condition to add new Amazon EC2 instances in increments to the Auto Scaling group when the average utilization of your Amazon EC2 fileet is high; and similarly, you can set a condition to remove instances in the same increments when CPU utilization is low. If you have predictable load changes, you can set a schedule through Auto Scaling to plan your scaling actMties. You can use Amazon CIoudWatch to send alarms to trigger scaling actMties and Elastic Load Balancing to help distribute traffic to your instances within Auto Scaling groups. Auto Scaling enables you to run your Amazon EC2 fileet at optimal utilization. Reference: http://aws.amazon.com/autoscaIing/

NEW QUESTION 10
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.htmI page is returned. Company C now would like a new page weIcome.htmI 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

• A. Upload an html page named we|come.htm| to their S3 bucket
• B. Create a welcome subfolder in their S3 bucket
• C. Set the Index Document property to weIcome.htmI
• D. Move the index.htmI page to a welcome subfolder
• E. Set the Error Document property to weIcome.htmI

Answer: AC

NEW QUESTION 11
What is the maximum time messages can be stored in SQS?

• A. 14 days
• B. one month
• C. 4 days
• D. 7 days

Answer: A

Explanation: A message can be stored in the Simple Queue Service (SQS) from 1 minute up to a maximum of 14 days. Reference: http://aws.amazon.com/sqs/faqs/#How_Iong_can_I_keep_my_messages_in_Amazon_SQS_queues

NEW QUESTION 12
An ELB is diverting traffic across 5 instances. One of the instances was unhealthy only for 20 minutes. What will happen after 20 minutes when the instance becomes healthy?

• A. ELB will never divert traffic back to the same instance
• B. ELB will not automatically send traffic to the same instanc
• C. However, the user can configure to start sending traffic to the same instance
• D. ELB starts sending traffic to the instance once it is healthy
• E. ELB terminates the instance once it is unhealth
• F. Thus, the instance cannot be healthy after 10 minutes

Answer: C

Explanation: AWS Elastic Load Balancing continuously checks the health of an instance. If one of the instances is unhealthy it stops sending traffic to it and automatically reroutes the traffic to the remaining running EC2 instances. If the failed EC2 instance is restored, Elastic Load Balancing will again start sending traffic to that instance.
Reference: http://docs.aws.amazon.com/E|asticLoadBaIancing/latest/DeveIoperGuide/Svclntro.htm|

NEW QUESTION 13
Which of the following is an example of a good DynamoDB hash key schema for provisioned throughput efficiency?

• A. User ID, where the application has many different users.
• B. Status Code where most status codes are the same
• C. Device ID, where one is by far more popular than all the others.
• D. Game Type, where there are three possible game types

Answer: A

NEW QUESTION 14
ExamKiIIer (with AWS account ID H1122223333) has created 50 IAM users for its orgAMzation’s employees. ExamKiIIer wants to make the AWS console login URL for all IAM users as: https:// examkiI|er.signin.aws.amazon.com/conso|e/. How can this be configured?

• A. Create a bucket with the name ExamKiI|er and map it with the IAM alias
• B. It is not possible to have capital letters as a part of the alias name
• C. The user needs to use Route 53 to map the ExamKiIIer domain and IAM URL
• D. For the AWS account, create an alias ExamKiIIer for the IAM login

Answer: B

Explanation: If a user wants the URL of the AWS IAM sign-in page to have the company name instead of the AWS
account ID, he can create an alias for his AWS account ID. The alias must be unique across all Amazon Webservices products and contain only digits, lowercase letters, and hyphens.
Reference: http://docs.aws.amazon.com/IAM/latest/UserGuide/AccountAIias.html

NEW QUESTION 15
A user is planning to make a mobile game which can be played online or offline and will be hosted on EC2.
The user wants to ensure that if someone breaks the highest score or they achieve some milestone they can inform all their colleagues through email. Which of the below mentioned AWS services helps achieve this goal?

• A. AWS Simple Workflow Service.
• B. AWS Simple Queue Service.
• C. Amazon Cognito
• D. AWS Simple Email Servic

Answer: D

Explanation: Amazon Simple Email Service (Amazon SES) is a highly scalable and cost-effective email-sending service for businesses and developers. It integrates with other AWS services, making it easy to send emails from applications that are hosted on AWS.
Reference: http://aws.amazon.com/ses/faqs/

NEW QUESTION 16
A user has launched an EBS backed Linux instance. How can a user detach the root device and attach it to another instance as a secondary volume?

• A. Unmount the root volume first and then detach it
• B. It is not possible to mount the root volume to some other instance
• C. Stop the first instance and then attach instance’s root volume as a new volume to the other instance
• D. It is not possible to mount the root device as a secondary volume on the other instance

Answer: C

Explanation: If an Amazon EBS volume is the root device of an instance, it cannot be detached unless the instance is in the stopped state.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-detaching-volume.html

NEW QUESTION 17
A root account owner is trying to setup an additional level of security for all his IAM users. Which of the below mentioned options is a recommended solution for the account owner?

• A. Enable access key and secret access key for all the IAM users
• B. Enable MFA for all IAM users
• C. Enable the password for all the IAM users
• D. Enable MFA for the root account

Answer: B

Explanation: Multi-Factor Authentication adds an extra level of security for all the users. The user can enable MFA for all IAM users which ensures that each user has to provide an extra six digit code for authentication. Reference: http://docs.aws.amazon.com/IAM/latest/UserGuide/Using_ManagingMFA.htmI

NEW QUESTION 18
What is the maximum size for messages stored in SQS?

• A. 256KB
• B. 128KB
• C. 1024KB
• D. 64KB

Answer: A

Explanation: By default, SQS queues allow you to send the largest supported payload size, currently 256KB. You can choose to specify a limit on how many bytes can be sent per payload, using the lVIaximumlVIessageSize attribute of the SetQueueAttributes method.
Reference: http://aws.amazon.com/sqs/faqs/