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Q171. – (Topic 3) 

An organization has created one IAM user and applied the below mentioned policy to the user. What entitlements do the IAM users avail with this policy? 

"Version": "2012-10-17", 

"Statement": [ 

"Effect": "Allow", 

"Action": "ec2:Describe*", 

"Resource": "*" 

}, 

"Effect": "Allow" 

"Action": [ 

"cloudwatch:ListMetrics", 

"cloudwatch:GetMetricStatistics", 

"cloudwatch:Describe*" 

], 

"Resource": "*" 

}, 

"Effect": "Allow", 

"Action": "autoscaling:Describe*", 

"Resource": "*" 

A. The policy will allow the user to perform all read only activities on the EC2 services 

B. The policy will allow the user to list all the EC2 resources except EBS 

C. The policy will allow the user to perform all read and write activities on the EC2 services 

D. The policy will allow the user to perform all read only activities on the EC2 services except load Balancing 

Answer:

Explanation: 

AWS Identity and Access Management is a web service which allows organizations to manage users and user permissions for various AWS services. If an organization wants to setup read only access to EC2 for a particular user, they should mention the action in the IAM policy which entitles the user for Describe rights for EC2, CloudWatch, Auto Scaling and ELB. In the policy shown below, the user will have read only access for EC2 and EBS, CloudWatch and Auto Scaling. Since ELB is not mentioned as a part of the list, the user will not have access to ELB. 

"Version": "2012-10-17", 

"Statement": [ 

"Effect": "Allow", 

"Action": "ec2:Describe*", 

"Resource": "*" 

}, 

"Effect": "Allow", 

"Action": [ 

"cloudwatch:ListMetrics", 

"cloudwatch:GetMetricStatistics", 

"cloudwatch:Describe*" 

], 

"Resource": "*" 

}, 

"Effect": "Allow", 

"Action": "autoscaling:Describe*", 

"Resource": "*" 

Q172. – (Topic 2) 

A user has created a web application with Auto Scaling. The user is regularly monitoring the application and he observed that the traffic is highest on Thursday and Friday between 8 AM to 6 PM. What is the best solution to handle scaling in this case? 

A. Add a new instance manually by 8 AM Thursday and terminate the same by 6 PM Friday 

B. Schedule Auto Scaling to scale up by 8 AM Thursday and scale down after 6 PM on Friday 

C. Schedule a policy which may scale up every day at 8 AM and scales down by 6 PM 

D. Configure a batch process to add a instance by 8 AM and remove it by Friday 6 PM 

Answer:

Explanation: 

Auto Scaling based on a schedule allows the user to scale the application in response to predictable load changes. In this case the load increases by Thursday and decreases by Friday. Thus, the user can setup the scaling activity based on the predictable traffic patterns of the web application using Auto Scaling scale by Schedule. 

Q173. – (Topic 3) 

A user has created a VPC with public and private subnets using the VPC wizard. The VPC has CIDR 

20.0.0.0/16. The private subnet uses CIDR 20.0.0.0/24 . The NAT instance ID is i-a12345. Which of the below mentioned entries are required in the main route table attached with the private subnet to allow instances to connect with the internet? 

A. Destination: 0.0.0.0/0 and Target: i-a12345 

B. Destination: 20.0.0.0/0 and Target: 80 

C. Destination: 20.0.0.0/0 and Target: i-a12345 

D. Destination: 20.0.0.0/24 and Target: i-a12345 

Answer:

Explanation: 

A user can create a subnet with VPC and launch instances inside that subnet. If the user has created a public private subnet, the instances in the public subnet can receive inbound traffic directly from the Internet, whereas the instances in the private subnet cannot. If these subnets are created with Wizard, AWS will create two route tables and attach to the subnets. The main route table will have the entry “Destination: 0.0.0.0/0 and Target: ia12345”, which allows all the instances in the private subnet to connect to the internet using NAT. 

Q174. – (Topic 2) 

A user has created a queue named “myqueue” in US-East region with AWS SQS. The user’s AWS account ID is 123456789012. If the user wants to perform some action on this queue, which of the below Queue URL should he use? 

A. http://sqs.us-east-1.amazonaws.com/123456789012/myqueue 

B. http://sqs.amazonaws.com/123456789012/myqueue 

C. http://sqs. 123456789012.us-east-1.amazonaws.com/myqueue 

D. http:// 123456789012.sqs. us-east-1.amazonaws.com/myqueue 

Answer:

Explanation: 

When creating a new queue in SQS, the user must provide a queue name that is unique within the scope of all queues of user’s account. If the user creates queues using both the latest WSDL and a previous version, he will have a single namespace for all his queues. Amazon SQS assigns each queue created by user an identifier called a queue URL, which includes the queue name and other components that Amazon SQS determines. Whenever the user wants to perform an action on a queue, he must provide its queue URL. The queue URL for the account id 123456789012 & queue name “myqueue” in US-East-1 region will be http:// sqs.us-east-1.amazonaws.com/123456789012/myqueue. 

Q175. – (Topic 3) 

A user is configuring the Multi AZ feature of an RDS DB. The user came to know that this RDS DB does not use the AWS technology, but uses server mirroring to achieve HA. Which DB is the user using right now? 

A. My SQL 

B. Oracle 

C. MS SQL 

D. PostgreSQL 

Answer:

Explanation: 

Amazon RDS provides high availability and failover support for DB instances using Multi AZ deployments. In a Multi AZ deployment, Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. Multi AZ deployments for Oracle, PostgreSQL, and MySQL DB instances use Amazon technology, while SQL Server (MS SQL. DB instances use SQL Server Mirroring. 

Q176. – (Topic 1) 

When creation of an EBS snapshot Is initiated but not completed the EBS volume? 

A. Cannot De detached or attached to an EC2 instance until me snapshot completes 

B. Can be used in read-only mode while me snapshot is in progress 

C. Can be used while me snapshot Is in progress 

D. Cannot be used until the snapshot completes 

Answer:

Explanation: Reference: 

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-copy-snapshot.html 

Q177. – (Topic 3) 

A user runs the command “dd if=/dev/xvdf of=/dev/null bs=1M” on an EBS volume created from a snapshot and attached to a Linux instance. Which of the below mentioned activities is the user performing with the step given above? 

A. Pre warming the EBS volume 

B. Initiating the device to mount on the EBS volume 

C. Formatting the volume 

D. Copying the data from a snapshot to the device 

Answer:

Explanation: 

When the user creates an EBS volume and is trying to access it for the first time it will encounter reduced IOPS due to wiping or initiating of the block storage. To avoid this as well as achieve the best performance it is required to pre warm the EBS volume. For a volume created from a snapshot and attached with a Linux OS, the “dd” command pre warms the existing data on EBS and any restored snapshots of volumes that have been previously fully pre warmed. This command maintains incremental snapshots; however, because this operation is read-only, it does not pre warm unused space that has never been written to on the original volume. In the command “dd if=/dev/xvdf of=/dev/null bs=1M” , the parameter “if=input file” should be set to the drive that the user wishes to warm. The “of=output file” parameter should be set to the Linux null virtual device, /dev/null. The “bs” parameter sets the block size of the read operation; for optimal performance, this should be set to 1 MB. 

Q178. A user is trying to setup a scheduled scaling activity using Auto Scaling. The user wants to setup the recurring schedule. Which of the below mentioned parameters is not required in this case? 

A. Maximum size 

B. Auto Scaling group name 

C. End time 

D. Recurrence value 

Answer:

Auto Scaling based on a schedule allows the user to scale the application in response to predictable load changes. The user can also configure the recurring schedule action which will follow the Linux cron format. If the user is setting a recurring event, it is required that the user specifies the Recurrence value (in a cron format., end time (not compulsory but recurrence will stop after this. and the Auto Scaling group for which the scaling activity is to be scheduled. 

Q179. – (Topic 3) 

In order to optimize performance for a compute cluster that requires low inter-node latency, which feature in the following list should you use? 

A. AWS Direct Connect 

B. Placement Groups 

C. VPC private subnets 

D. EC2 Dedicated Instances 

E. Multiple Availability Zones 

Answer:

Q180. – (Topic 2) 

A sys admin has created a shopping cart application and hosted it on EC2. The EC2 instances are running behind ELB. The admin wants to ensure that the end user request will always go to the EC2 instance where the user session has been created. How can the admin configure this? 

A. Enable ELB cross zone load balancing 

B. Enable ELB cookie setup 

C. Enable ELB sticky session 

D. Enable ELB connection draining 

Answer:

Explanation: 

Generally AWS ELB routes each request to a zone with the minimum load. The Elastic Load Balancer provides a feature called sticky session which binds the user’s session with a specific EC2 instance. If the sticky session is enabled the first request from the user will be redirected to any of the EC2 instances. But, henceforth, all requests from the same user will be redirected to the same EC2 instance. This ensures that all requests coming from the user during the session will be sent to the same application instance. 

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