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AWS-Certified-Developer-Associate AWS Certified Developer Associate Exam (DVA-C02) is now Stable and With Pass Result | Test Your Knowledge for Free

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AWS Certified Developer Associate Exam (DVA-C02)

Last Update 5 days ago
Total Questions : 368

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Question # 41

A company is building a stock trading application that requires sub-millisecond latency in processing trading requests. Amazon DynamoDB is used to store all the trading data that is used to process each request. After load testing the application, the development team found that due to data retrieval times, the latency requirement is not satisfied. Because of sudden high spikes in the number of requests, DynamoDB read

capacity has to be significantly over-provisioned to avoid throttling.

What steps should be taken to meet latency requirements and reduce the cost of running the application?

Options:

A.  

Add Global Secondary Indexes for trading data.

B.  

Store trading data in Amazon S3 and use Transfer Acceleration.

C.  

Add retries with exponential back-off for DynamoDB queries

D.  

Use DynamoDB Accelerator to cache trading data.

Discussion 0
Question # 42

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

Options:

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

Discussion 0
Question # 43

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?

Options:

A.  

1 write capacity unit

B.  

10 write capacity units

C.  

60 write capacity units

D.  

600 write capacity units

E.  

3600 write capacity units

Discussion 0
Question # 44

A Development team has pushed out 10 applications running on several Amazon EC2 instances. The Operations team is asking for a graphical representation of one key performance metric for each application. These metrics should be available on one screen for easy monitoring.

Which steps should the Developer take to accomplish this using Amazon CloudWatch?

Options:

A.  

Create a custom namespace with a unique metric name for each application.

B.  

Create a custom dimension with a unique metric name for each application.

C.  

Create a custom event with a unique metric name for each application.

D.  

Create a custom alarm with a unique metric name for each application.

Discussion 0
Question # 45

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

Options:

A.  

Upload an html page named welcome.html to their S3 bucket

B.  

Create a welcome subfolder in their S3 bucket

C.  

Set the Index Document property to welcome.html

D.  

Move the index.html page to a welcome subfolder

E.  

Set the Error Document property to welcome.html

Discussion 0
Question # 46

Company D is running their corporate website on Amazon S3 accessed from http//www.companyd.com. Their marketing team has published new web fonts to a separate S3 bucket accessed by the S3 endpoint https://s3-us-west-1.amazonaws.com/cdfonts. While testing the new web fonts, Company D recognized the web fonts are being blocked by the browser.

What should Company D do to prevent the web fonts from being blocked by the browser?

Options:

A.  

Enable versioning on the cdfonts bucket for each web font

B.  

Create a policy on the cdfonts bucket to enable access to everyone

C.  

Add the Content-MD5 header to the request for webfonts in the cdfonts bucket from the website

D.  

Configure the cdfonts bucket to allow cross-origin requests by creating a CORS configuration

Discussion 0
Question # 47

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 two approaches can satisfy the objectives? Choose 2 answers

Options:

A.  

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.

B.  

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 appropriate S3 bucket.

C.  

The application authenticates against IAM Security Token Service using the LDAP credentials. The application uses those temporary AWS security credentials to access the appropriate S3 bucket.

D.  

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 bucket.

E.  

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 appropriate S3 bucket.

Discussion 0
Question # 48

Which of the following items are required to allow an application deployed on an EC2 instance to write data to a DynamoDB table?

Assume that no security Keys are allowed to be stored on the EC2 instance. Choose 2 answers

Options:

A.  

Create an IAM User that allows write access to the DynamoDB table.

B.  

Add an IAM Role to a running EC2 instance.

C.  

Add an IAM User to a running EC2 Instance.

D.  

Launch an EC2 Instance with the IAM Role included in the launch configuration.

E.  

Create an IAM Role that allows write access to the DynamoDB table.

F.  

Launch an EC2 Instance with the IAM User included in the launch configuration.

Discussion 0
Question # 49

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?

Options:

A.  

Use Amazon Cognito user pools and a custom authorizer to authenticate and authorize users based on JSON Web Tokens.

B.  

Build a OpenID token broker with Amazon and Facebook. Users will authenticate with these identify providers and pass the JSON Web Token to the API to authenticate each API call.

C.  

Store user credentials in Amazon DynamoDB and have the application retrieve temporary credentials from AWS STS. Make API calls by passing user credentials to the APIs for authentication and authorization.

D.  

Use Amazon RDS to store user credentials and pass them to the APIs for authentications and authorization.

Discussion 0
Question # 50

Which of the following services are key/value stores? Choose 3 answers

Options:

A.  

Amazon ElastiCache

B.  

Simple Notification Service

C.  

DynamoDB

D.  

Simple Workflow Service

E.  

Simple Storage Service

Discussion 0
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