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May 19, 2017

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Q41. Is there a limit to how much throughput you can get out of a single table in DynamoDB?

A. Yes, not more than 1,000 writes/second or 1,000 reads/second

B. No

C. Yes, not more than 10,000 writes/second or 10,000 reads/second

D. No, but If you wish to exceed throughput rates of 10,000 writes/second or 10,000 reads/second, you must first contact AWS.

Answer:

Explanation:

In DynamoDB, you can increase the throughput you have provisioned for your table using UpdateTabIe API or in the AWS Management Console. If you wish to exceed throughput rates of 10,000 writes/second or 10,000 reads/second, you must first contact AWS.

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


Q42. A user is planning to use EBS for his DB requirement. The user already has an EC2 instance running in the VPC private subnet. How can the user attach the EBS volume to a running instance?

A. The user must create EBS within the same VPC and then attach it to a running instance.

B. The user can create EBS in the same zone as the subnet of instance and attach that EBS to instance.

C. It is not possible to attach an EBS to an instance running in VPC until the instance is stopped.

D. The user can specify the same subnet while creating EBS and then attach it to a running instance. 

Answer: B

Explanation:

A Virtual Private Cloud (VPC) is a virtual network dedicated to the user’s AWS account. The user can create subnets as per the requirement within a VPC. The VPC is always specific to a region. The user can create a VPC which can span multiple Availability Zones by adding one or more subnets in each Availability Zone.

The instance launched will always be in the same availability zone of the respective subnet. When creating an EBS the user cannot specify the subnet or VPC. However, the user must create the EBS in the same zone as the instance so that it can attach the EBS volume to the running instance.

Reference:        http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.htm|#VPCSubnet


Q43. 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


Q44. A user is planning to host MS SQL on an EBS volume. It was recommended to use the AWS RDS. What advantages will the user have if he uses RDS in comparison to an EBS based DB?

A. Better throughput with PIOPS

B. Automated backup

C. NIS SQL is not supported with RDS

D. High availability with multi AZs 

Answer: B

Explanation:

Comparing with on-premises or EC2 based NIS SQL, RDS provides an automated backup feature. PIOPS is available with both RDS and EBS. However, HA is not available with NIS SQL.

Reference: https://aws.amazon.com/rds/faqs/


Q45. You are using Amazon SQS and are getting a "Queue Deleted RecentIy" error. What is wrong?

A. The message is too big

B. You have incorrect permissions

C. Another user has deleted the queue

D. If you delete a queue, you need to wait for at least 60 seconds before creating a queue with the same name

Answer:

Explanation:

If you delete a queue, you need to wait for at least 60 seconds before creating a queue with the same name. Please note that when you delete a queue, the deletion process takes up to 60 seconds. Requests you send to a recently deleted queue might succeed during the 60-second period. For example, a SendlVIessage request might succeed, but after 60 seconds the queue and that message you sent no longer exists.

Reference: https://aws.amazon.com/items/1343?externaI|D=1343


Q46. AWS Elastic Beanstalk will change the health status of a web server environment tier to gray color when:

A. AWS Elastic Beanstalk detects other problems with the environment that are known to make the application unavailable

B. Your application hasn't responded to the application health check URL within the last one hour.

C. Your application hasn't responded to the application health check URL within the last five minutes.

D. Your appIication's health status is unknown because status is reported when the application is not in the ready state.

Answer:

Explanation:

AWS Elastic Beanstalk will change the health status of a web server environment tier to gray color when your appIication's health status is unknown (because status is reported when the application is not in the ready state).

Reference:        http://docs.aws.amazon.com/elasticbeanstaIk/latest/dg/using-features.heaIthstatus.htmI


Q47. How many types of block devices does Amazon EC2 support?

A. 5

B. 1

C. 2

D. 4

Answer:

Explanation:

Amazon EC2 supports 2 types of block devices. Reference:

http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html


Q48. A user is creating multiple IAM users. What advice should be given to him to enhance the security?

A. Grant least prMleges to the indMdual user

B. Grant all higher prMleges to the group

C. Grant less prMleges for user, but higher prMleges for the group

D. Grant more prMleges to the user, but least prMleges to the group 

Answer: A

Explanation:

It is a recommended rule that the root user should grant the least prMleges to the IAM user or the group. The higher the prMleges, the more problems it can create.

Reference:       http://docs.aws.amazon.com/IAM/latest/UserGuide/IAMBestPractices.htmI


Q49. 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 operations. 

Answer: D

Explanation:

Amazon DynamoDB supports increment and decrement atomic operations.

Reference:        http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/APISummary.html


Q50. Which of the following device names is recommended for an EBS volume that can be attached to an Amazon EC2 Instance running Windows?

A. xvd[a-e]

B. /mnt/sd[b-e]

C. xvd[f-p]

D. /dev/sda1 

Answer: C

Explanation:

The xvd[f-p] is the recommended device name for EBS volumes that can be attached to the Amazon EC2 Instances running on Windows.

Reference:       http://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/device_naming.html



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