DVA-C01 Exam - AWS Certified Developer Associate Exam

NEW QUESTION 1
A user is planning to host data with RDS. Which of the below mentioned databases is not supported by RDS?

• A. PostgreSQL
• B. SQLDB
• C. Oracle
• D. MS SQL

Answer: B

Explanation:
Amazon Relational Database Service (Amazon RDS) is a web service that makes it easier to set up, operate, and scale a relational database in the cloud. AWS RDS supports popular DBs, such as lV|ySQL, PostgreSQL, MS SQL and Oracle. This means that the code, applications, and tools user is already using with existing databases can be used with Amazon RDS too. In short, it is a managed Relation Database offering from AWS which manages backups, software patching, automatic failure detection, and recovery of Database.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html

NEW QUESTION 2
The user has created multiple AutoScaIing groups. The user is trying to create a new AS group but it fails. How can the user know that he has reached the AS group limit specified by AutoScaIing in that region?

• A. Run the command: as-describe-account-limits
• B. Run the command: as-describe-group-limits
• C. Run the command: as-max-account-limits
• D. Run the command: as-list-account-limits

Answer: A

Explanation:
A user can see the number of AutoScaIing resources currently allowed for the AWS account either by using the as-describe-account-Iimits command or by calling the DescribeAccountLimits action. Reference:http://docs.aws.amazon.com/AutoScaIing/latest/DeveIoperGuide/ts-as-capacity.html

NEW QUESTION 3
Regarding Amazon SNS, when you want to subscribe to a topic and receive notifications to your email, in the Protocol drop-down box, you should select .

• A. Email
• B. Message
• C. SMTP
• D. IMAP

Answer: A

Explanation:
In Amazon SNS, when you want to subscribe to a topic and receive notifications to your email, select Email in the Protocol drop-down box. Enter an email address you can use to receive the notification in the Endpoint field.
Reference: http://docs.aws.amazon.com/sns/latest/dg/SubscribeTopic.html

NEW QUESTION 4
A user has created a queue named "myqueue" with SQS. There are four messages published to queue which are not received by the consumer yet. If the user tries to delete the queue, what will happen?

• A. A user can never delete a queue manuall
• B. AWS deletes it after 30 days of inactMty on queue
• C. It will initiate the delete but wait for four days before deleting until all messages are deleted automatically.
• D. It will ask user to delete the messages first
• E. It will delete the queue

Answer: D

Explanation:
SQS allows the user to move data between distributed components of applications so they can perform different tasks without losing messages or requiring each component to be always available. The user can delete a queue at any time, whether it is empty or not. It is important to note that queues retain
messages for a set period of time. By default, a queue retains messages for four days. Reference:
http://docs.aws.amazon.com/AWSSimpIeQueueService/latest/SQSDeveIoperGuide/SQSConcepts.html

NEW QUESTION 5
In regards to Amazon SQS how many times will you receive each message?

• A. At least twice
• B. Exactly once
• C. As many times as you want
• D. At least once

Answer: D

Explanation:
Amazon SQS is engineered to provide "at least once" delivery of all messages in its queues. Although most of the time, each message will be delivered to your application exactly once, you should design your system so that processing a message more than once does not create any errors or inconsistencies. Reference: https://aws.amazon.com/sqs/faqs/

NEW QUESTION 6
Games-R-Us is launching a new game app for mobile devices. Users will log into the game using their existing Facebook account and the game will record player data and scoring information directly to a DynamoDB table.
What is the most secure approach for signing requests to the DynamoDB API?

• A. Create an IAM user with access credentials that are distributed with the mobile app to sign the requests
• B. Distribute the AWS root account access credentials with the mobile app to sign the requests
• C. Request temporary security credentials using web identity federation to sign the requests
• D. Establish cross account access between the mobile app and the DynamoDB table to sign the requests

Answer: C

NEW QUESTION 7
A user is planning to use the AWS RDS with MySQL. Which of the below mentioned services the user is not going to pay?

• A. Data transfer
• B. RDS Cloudwatch metrics
• C. Data storage
• D. I/O requests per month

Answer: B

Explanation:
RDS charges the user on a pay as you go basis. It charges the user based on the instance type, number of hours that the instance is running, data transfer, storage cost as well for the I/O requests. The monitoring is free of cost.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html

NEW QUESTION 8
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 9
ExamKiIIer (with AWS account ID H1122223333) has created 50 IAM users for its orgAMzation’s employees. ExamKiI|er wants to make the AWS console login URL for all IAM users like: https://examki||er.signin.aws.amazon.com/consoIe/. How can this be configured?

• A. The user needs to use Route 53 to map the examkiller domain and IAM URL
• B. Create an IAM AWS account alias with the name examkiller
• C. It is not possible to have a personalized IAM login URL
• D. Create an IAM hosted zone Identity for the domain examkiller

Answer: B

Explanation:
If a user wants the URL of the AWS IAM sign-in page to have a company name instead of the AWS account ID, he can create an alias for his AWS account ID.
Reference: http://docs.aws.amazon.com/IAM/latest/UserGuide/AccountAIias.html

NEW QUESTION 10
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 11
In regard to DynamoDB, what is the Global secondary index?

• A. An index with a hash and range key that can be different from those on the table.
• B. An index that has the same range key as the table, but a different hash key
• C. An index that has the same hash key and range key as the table
• D. An index that has the same hash key as the table, but a different range key

Answer: A

Explanation:
Global secondary index - an index with a hash and range key that can be different from those on the table.
Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModel.html

NEW QUESTION 12
After launching an instance that you intend to serve as a NAT (Network Address Translation) device in a public subnet you modify your route tables to have the NAT device be the target of internet bound traffic of your private subnet. When you try and make an outbound connection to the Internet from an instance in the private subnet, you are not successful.
Which of the following steps could resolve the issue?

• A. Attaching a second Elastic Network interface (ENI) to the NAT instance, and placing it in the private subnet
• B. Attaching a second Elastic Network Interface (ENI) to the instance in the private subnet, and placing it in the public subnet
• C. Disabling the Source/Destination Check attribute on the NAT instance
• D. Attaching an Elastic IP address to the instance in the private subnet

Answer: C

NEW QUESTION 13
The AWS console for DynamoDB enables you to do all the following operations, except:

• A. Set up alarms to monitor your tabIe's capacity usage.
• B. Create, update, and delete tables.
• C. Import Data from other databases or from files.
• D. View your tabIe's top monitoring metrics on real-time graphs from CIoudWatc

Answer: C

Explanation:
The AWS console for DynamoDB enables you to do all the above operation but not Importing Data from other databases or from files and it is not possible to do it.
Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ConsoIeDynamoDB.html

NEW QUESTION 14
A user wants to access RDS from an EC2 instance using IP addresses. Both RDS and EC2 are in the same region, but different AZs. Which of the below mentioned options help configure that the instance is accessed faster?

• A. Configure the Private IP of the Instance in RDS security group
• B. Security group of EC2 allowed in the RDS security group
• C. Configuring the elastic IP of the instance in RDS security group
• D. Configure the Public IP of the instance in RDS security group

Answer: A

Explanation:
If the user is going to specify an IP range in RDS security group, AWS recommends using the private IP address of the Amazon EC2 instance. This provides a more direct network route from the Amazon EC2 instance to the Amazon RDS DB instance, and does not incur network charges for the data sent outside of the Amazon network.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithSecurityGroups.html

NEW QUESTION 15
Which EC2 API call would you use to retrieve a list of Amazon Machine Images (AMIs)?

• A. Descnbelnstances
• B. DescribeAMIs
• C. Describelmages
• D. GetAMIs
• E. You cannot retrieve a list of AMIs as there are over 10,000 AMIs

Answer: E

NEW QUESTION 16
In AWS Elastic Beanstalk, you can update your deployed application even while it is part of a running environment. For a Java application, you can also use to update your deployed application.

• A. the AWS Toolkit for Eclipse
• B. the AWS Toolkit for Visual Studio
• C. the AWS Toolkit for JVM
• D. the AWS Toolkit for Netbeans

Answer: A

Explanation:
In AWS Elastic Beanstalk, you can update your deployed application, even while it is part of a running environment. For a Java application, you can also use the AWS Toolkit for Eclipse to update your deployed application.
Reference: http://docs.aws.amazon.com/elasticbeanstaIk/latest/dg/GettingStarted.WaIkthrough.htmI

NEW QUESTION 17
Which of the following programming languages have an officially supported AWS SDK? Choose 2 answers

• A. Perl
• B. PHP
• C. Pascal
• D. Java
• E. SQL

Answer: BD

NEW QUESTION 18
A user has hosted a website on AWS and uses ELB to load balance the multiple instances. The user application does not have any cookie management. How can the user bind the session of the requestor with a particular instance?

• A. Bind the IP address with a sticky cookie
• B. Create a cookie at the application level to set at ELB
• C. Use session synchronization with ELB
• D. Let ELB generate a cookie for a specified duration

Answer: D

Explanation:
The key to manage the sticky session is determining how long the load balancer should route the user's request to the same application instance. If the application has its own session cookie, then the user can set the Elastic Load Balancing to create the session cookie to follow the duration specified by the appIication's session cookie. If the user’s application does not have its own session cookie, then he can set the Elastic Load Balancing to create a session cookie by specifying his own stickiness duration. Reference: http://docs.aws.amazon.com/EIasticLoadBaIancing/latest/DeveIoperGuide/US_StickySessions.html

NEW QUESTION 19
How can you secure data at rest on an EBS volume?

• A. Attach the volume to an instance using EC2's SSL interface.
• B. Write the data randomly instead of sequentially.
• C. Use an encrypted file system on top of the BBS volume.
• D. Encrypt the volume using the S3 server-side encryption service.
• E. Create an IAM policy that restricts read and write access to the volum

Answer: C

NEW QUESTION 20
A user has created a new EBS volume from an existing snapshot. The user mounts the volume on the instance to which it is attached. Which of the below mentioned options is a required step before the user can mount the volume?

• A. Run a cyclic check on the device for data consistency
• B. Create the file system of the volume
• C. Resize the volume as per the original snapshot size
• D. No step is require
• E. The user can directly mount the device

Answer: D

Explanation:
When a user is trying to mount a blank EBS volume, it is required that the user first creates a file system within the volume. If the volume is created from an existing snapshot then the user needs not to create a file system on the volume as it will wipe out the existing data.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-using-volumes.htmI

NEW QUESTION 21
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?

• 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

Answer: B

NEW QUESTION 22
The user has configured AutoScaIing based on the dynamic policy. Which of the following is not the right command to specify a change in capacity as a part of the policy?

• A. "adjustment=-50" (type is PercentChangeInCapacity)
• B. "adjustment=3" (type is ExactCapacity)
• C. "adjustment=-1" (type is ChangeInCapacity)
• D. "adjustment=-8" (type is ExactCapacity)

Answer: D

Explanation:
The user can configure the AutoScaIing group to automatically scale up and then scale down based on the various specified CIoudWatch monitoring conditions. The user needs to provide the adjustment value and the adjustment type. A positive adjustment value increases the current capacity and a negative adjustment value decreases the current capacity. The user can express the change to the current size as an absolute number, an increment or as a percentage of the current group size.
In this option specifying the exact capacity with the adjustment value = -8 will not work as when type is exact capacity the adjustment value cannot be negative.
Reference:
http://docs.aws.amazon.com/AutoScaling/latest/DeveIoperGuide/as-scaIe-based-on-demand.html

NEW QUESTION 23
Which of the following services are included at no additional cost with the use of the AWS platform? Choose 2 answers

• A. Simple Storage Service
• B. Elastic Compute Cloud
• C. Auto Scaling
• D. Elastic Load Balancing
• E. CIoudFormation
• F. Simple Workflow Service

Answer: CE

NEW QUESTION 24
When you create a table with a hash-and-range key, you must define one or more secondary indexes on that table.

• A. False, hash-range key is another name for secondary index
• B. False, it is optional
• C. True
• D. False, when you have Hash-Range key you cannot define Secondary index

Answer: B

Explanation:
When you create a table with a hash-and-range key in DynamoDB, you can also define one or more secondary indexes on that table.
Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LSI.htmI

NEW QUESTION 25
In relation to Amazon SQS, how many queues and messages can you have per queue for each user?

• A. Unlimited
• B. 10
• C. 256
• D. 500

Answer: A

Explanation:
Amazon SQS supports an unlimited number of queues and unlimited number of messages per queue for each user. Please be aware that Amazon SQS automatically deletes messages that have been in the queue for more than 4 days.
Reference: https://aws.amazon.com/items/1343?externaIID=1343

NEW QUESTION 26
What type of block cipher does Amazon S3 offer for server side encryption?

• A. Triple DES
• B. Advanced Encryption Standard
• C. Blowfish
• D. RC5

Answer: B

NEW QUESTION 27
An account owner has created an IAM user with the name examkiller. The account owner wants to give EC2 access of only the US West region to that IAM user. How can the owner configure this?

• A. While creating a policy provide the region as a part of the resources
• B. Create an IAM user in the US West region and give access to EC2
• C. Create an IAM policy and define the region in the condition
• D. It is not possible to provide access based on the region

Answer: C

Explanation:
The IAM policy is never region specific. If the user wants to configure the region specific setting, he needs to provide conditions as part of the policy.
Reference: http://awspolicygen.s3.amazonaws.com/poIicygen.htmI

NEW QUESTION 28
In DynamoDB, to get a detailed listing of secondary indexes on a table, you can use the action.

• A. DescribeTabIe
• B. BatchGetItem
• C. Getltem
• D. TabIeName

Answer: A

Explanation:
In DynamoDB, DescribeTab|e returns information about the table, including the current status ofthe table, when it was created, the primary key schema, and any indexes on the table.
Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Secondarylndexes.htmI

NEW QUESTION 29
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 30
A user has created a MySQL RDS instance. Which of the below mentioned options is mandatory to configure while creating an instance?

• A. MuIti AZ deployment setup
• B. Automated backup window
• C. Availability Zone
• D. Maintenance window

Answer: A

Explanation:
When creating an RDS instance, the user needs to specify whether it is Nlulti AZ or not. If the user does not provide the value for the zone, the maintenance window or automated backup window, RDS will automatically select the value.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.lV|u|tiAZ.htmI

NEW QUESTION 31
......