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The AWS Certified Developer - Associate certification is an excellent way to demonstrate your expertise in AWS development, and enhance your career as an AWS developer. AWS Certified Developer Associate Exam (DVA-C02) certification exam is rigorous and challenging, but with the right preparation and study, you can pass the exam and prove your skills as an AWS developer.

Amazon AWS Certified Developer Associate Exam (DVA-C02) Sample Questions (Q225-Q230):

NEW QUESTION # 225
A developer is testing a RESTful application that is deployed by using Amazon API Gateway and AWS Lambda When the developer tests the user login by using credentials that are not valid, the developer receives an HTTP 405 METHOD_NOT_ALLOWED error The developer has verified that the test is sending the correct request for the resource Which HTTP error should the application return in response to the request?

A. HTTP 401
B. HTTP 505
C. HTTP 503
D. HTTP 404

Answer: A

Explanation:
* HTTP Status Codes: Each HTTP status code has a specific meaning in RESTful APIs.
* HTTP 405 (Method Not Allowed): Indicates that the request method (e.g., POST) is not supported for the specified resource.
* HTTP 401 (Unauthorized): Represents a failure to authenticate, which is the appropriate response for invalid login credentials.
References:
HTTP Status Codes: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status

NEW QUESTION # 226
An e-commerce site allows returning users to log in to display customized web pages. The workflow is shown in the image below:

An application is running on EC2 instances. Amazon RDS is used for the database that stores user accounts and preferences. The website freezes or is slow to load while waiting for the login step to complete. The remaining components of the site are well-optimized.
Which of the following techniques will resolve this issue? (Select Two.)

A. Call the database asynchronously so the code can continue executing.
B. Use Amazon ElastiCache for MemCached to cache user data.
C. Implement the user login page as an asynchronous Lambda function.
D. Use Amazon Application Load Balancer to load balance the traffic to the website.
E. Batch login requests from hundreds of users together as a single read request to the database.

Answer: A,B

NEW QUESTION # 227
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?

A. Use the multi-part upload API for this object
B. Contact support to increase your object size limit
C. None, Simple Storage Service objects are limited to 5 GB
D. Upload to a different region
E. Use the large object upload API for this object

Answer: A

NEW QUESTION # 228
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: B

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/#Billing

NEW QUESTION # 229
In regard to DynamoDB, can I modify the index once it is created?

A. Yes, if it is a Global secondary index
B. Yes, if it is a primary hash key index
C. No
D. Yes, if it is a local secondary index

Answer: C

Explanation:
Currently, in DynamoDB, an index cannot be modified once it is created.
http://aws.amazon.com/dynamodb/faqs/#security_anchor

NEW QUESTION # 230
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