[Verified] AWS-Certified-Developer-Associate Amazon test 21-30 (Aug 2017)

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Q21. Your manager has requested you to tag EC2 instances to orgAMze and manage a load balancer. Which of the following statements about tag restrictions is incorrect?

A. The maximum key length is 127 Unicode characters.

B. The maximum value length is 255 Unicode characters.

C. Tag keys and values are case sensitive.

D. The maximum number of tags per load balancer is 20. 

Answer: D

Explanation:

Tags help you to categorize your load balancers in different ways, for example, by purpose, owner, or environment. The following basic restrictions apply to tags: The maximum number of tags per resource is

10. The maximum key length is 127 Unicode characters. The maximum value length that can be used is 255 Unicode characters. The tag keys and values are case sensitive. Allowed characters are letters, spaces, and numbers representable in UTF-8, plus the following special characters: + – =. _ : / @. Do not use leading or trailing spaces. Do not use the aws: prefix in your tag names or values because it is reserved for AWS use. You can't edit or delete tag names or values with this prefix. Tags with this prefix do not count against your tags per resource limit.

Reference:

http://docs.aws.amazon.com/EIasticLoadBaIancing/latest/DeveIoperGuide/add-remove-tags.htmI#tag-res trictions

Q22. A user has created an application which sends data to a log file. The server hosting the log files can be unavailable due to any reason. The user wants to make it so that whenever the log server is up it should  be receMng the messages. Which of the below mentioned AWS services helps achieve this functionality?

A. AWS Simple Workflow

B. AWS Simple Task Service

C. AWS Simple Notification Service

D. AWS Simple Queue Service 

Answer: D

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 use SQS to transmit any volume of data without losing messages or requiring other services to always be available. Using SQS, the application has to just send the data to SQS and SQS transmits it to the log file whenever it is available.

Reference: http://aws.amazon.com/sqs/

Q23. 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

Q24. What does Amazon SQS provide?

A. An asynchronous message queue service.

B. A Simple Query Sewer, managed directly by Amazon Web Services.

C. None of these.

D. A synchronous message queue service.

Answer: A

Explanation:

Amazon SQS stands for Simple Queue Services, and provides a cost-effective way to decouple the components of your application through an asynchronous message queue service

Reference: http://aws.amazon.com/sqs/

Q25. A user is creating a new EBS volume from an existing snapshot. The snapshot size shows 10 GB. Can the user create a volume of 30 GB from that snapshot?

A. Provided the original volume has set the change size attribute to true

B. Yes

C. Provided the snapshot has the modify size attribute set as true

D. No

Answer:

Explanation:

A user can always create a new EBS volume of a higher size than the original snapshot size. The user cannot create a volume of a lower size. When the new volume is created the size in the instance will be shown as the original size. The user needs to change the size of the device with resize2fs or other OS specific commands.

Reference:       http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-expand-volume.htmI

Q26. You have been doing a lot of testing of your VPC Network by deliberately failing EC2 instances to test whether instances are failing over properly. Your customer who will be paying the AWS bill for all this asks you if he being charged for all these instances. You try to explain to him how the billing works on EC2 instances to the best of your knowledge. What would be an appropriate response to give to the customer

in regards to this?

A. Billing commences when Amazon EC2 AMI instance is completely up and billing ends as soon as the instance starts to shutdown.

B. Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance and billing ends when the instance shuts down.

C. Billing only commences only after 1 hour of uptime and billing ends when the instance terminates.

D. Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance and billing ends as soon as the instance starts to shutdown.

Answer:

Explanation:

Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance. Billing ends when the instance shuts down, which could occur through a web services command, by running "shutdown -h", or through instance failure.

Reference: http://aws.amazon.com/ec2/faqs/#BiIIing

Q27. A user is enabling logging on a particular bucket. Which of the below mentioned options may be best suitable to allow access to the log bucket?

A. Create an IAM policy and allow log access

B. It is not possible to enable logging on the S3 bucket

C. Create an IAM Role which has access to the log bucket

D. Provide ACL for the logging group 

Answer: D

Explanation:

The only recommended use case for the S3 bucket ACL is to grant the write permission to the Amazon S3 Log Delivery group to write access log objects to the user’s bucket.

Reference:        http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-alternatives-guidelines.html

Q28. In DynamoDB, could you use IAM to grant access to Amazon DynamoDB resources and API actions?

A. Yes

B. Depended to the type of access

C. In DynamoDB there is no need to grant access

D. No

Answer:

Explanation:

Amazon DynamoDB integrates with AWS Identity and Access Management (IAM). You can use AWS IAM to grant access to Amazon DynamoDB resources and API actions. To do this, you first write an AWS IAM policy, which is a document that explicitly lists the permissions you want to grant. You then attach that  policy to an AWS IAM user or role.

Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/UsingIAMWithDDB.htmI

Q29. A user is trying to share a video file with all his friends. Which of the below mentioned AWS services will be cheapest and easy to use?

A. AWS S3

B. AWS EC2

C. AWS RRS

D. AWS Glacier 

Answer: C

Explanation:

AWS RRS provides the same functionality as AWS S3, but at a cheaper rate. It is ideally suited for non mission critical applications. It provides less durability than S3, but is a cheaper option.

Reference:      http://docs.aws.amazon.com/AmazonS3/Iatest/dev/UsingRRS.htmI

Q30. You want to have multiple versions of your application running at the same time, with all versions launched via AWS Elastic Beanstalk. Is this possible?

A. No. However if you have 2 AWS accounts this can be done

B. No. AWS Elastic Beanstalk is not designed to support multiple running environments

C. Yes. AWS Elastic Beanstalk is designed to support a number of multiple running environments

D. Yes. However AWS Elastic Beanstalk is designed to support only 2 multiple running environments 

Answer: C

Explanation:

AWS Elastic Beanstalk is designed to support multiple running environments. As an example you could have one for integration testing, one for pre-production, and one for production, with each environment independently configured and running on its own separate AWS resources.

Reference: https://aws.amazon.com/elasticbeansta|k/faqs/

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