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Q141. – (Topic 2) 

A user has launched an EBS backed EC2 instance. The user has rebooted the instance. Which of the below mentioned statements is not true with respect to the reboot action? 

A. The private and public address remains the same 

B. The Elastic IP remains associated with the instance 

C. The volume is preserved 

D. The instance runs on a new host computer 

Answer:

Explanation: 

A user can reboot an EC2 instance using the AWS console, the Amazon EC2 CLI or the Amazon EC2 API. Rebooting an instance is equivalent to rebooting an operating system. However, it is recommended that the user use the Amazon EC2 to reboot the instance instead of running the operating system reboot command from the instance. The instance remains on the same host computer and maintains its public DNS name, private IP address, and any data on its instance store volumes. It typically takes a few minutes for the reboot to complete, but the time it takes to reboot depends on the instance configuration. 

Q142. – (Topic 3) 

A user has created a VPC with CIDR 20.0.0.0/16. The user has created one subnet with CIDR 20.0.0.0/16 by mistake. The user is trying to create another subnet of CIDR 20.0.0.1/24. How can the user create the second subnet? 

A. There is no need to update the subnet as VPC automatically adjusts the CIDR of the first subnet based on the second subnet’s CIDR 

B. The user can modify the first subnet CIDR from the console 

C. It is not possible to create a second subnet as one subnet with the same CIDR as the VPC has been created 

D. The user can modify the first subnet CIDR with AWS CLI 

Answer:

Explanation: 

A Virtual Private Cloud (VPC. is a virtual network dedicated to the user’s AWS account. A user can create a subnet with VPC and launch instances inside the subnet. The user can create a subnet with the same size of VPC. However, he cannot create any other subnet since the CIDR of the second subnet will conflict with the first subnet. The user cannot modify the CIDR of a subnet once it is created. Thus, in this case if required, the user has to delete the subnet and create new subnets. 

Q143. – (Topic 3) 

How can an EBS volume that is currently attached to an EC2 instance be migrated from one Availability Zone to another? 

A. Simply create a new volume in the other AZ and specify the original volume as the source. 

B. Detach the volume, then use the ec2-migrate-volume command to move it to another AZ. 

C. Create a snapshot of the volume, and create a new volume from the snapshot in the other AZ. 

D. Detach the volume and attach it to another EC2 instance in the other AZ. 

Answer:

Explanation: Reference: 

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumes.html 

Q144. – (Topic 3) 

A user has launched an EBS backed instance with EC2-Classic. The user stops and starts the instance. Which of the below mentioned statements is not true with respect to the stop/start action? 

A. The instance gets new private and public IP addresses 

B. The volume is preserved 

C. The Elastic IP remains associated with the instance 

D. The instance may run on a anew host computer 

Answer:

Explanation: 

A user can always stop/start an EBS backed EC2 instance. When the user stops the instance, it first enters the stopping state, and then the stopped state. AWS does not charge the running cost but charges only for the EBS storage cost. If the instance is running in EC2-Classic, it receives a new private IP address; as the Elastic IP address (EIP. associated with the instance is no longer associated with that instance. 

Q145. – (Topic 1) 

An organization has configured a VPC with an Internet Gateway (IGW). pairs of public and 

private subnets (each with one subnet per Availability Zone), and an Elastic Load Balancer (ELB) configured to use the public subnets The application s web tier leverages the ELB. Auto Scaling and a mum-AZ RDS database instance The organization would like to eliminate any potential single points ft failure in this design. 

What step should you take to achieve this organization's objective? 

A. Nothing, there are no single points of failure in this architecture. 

B. Create and attach a second IGW to provide redundant internet connectivity. 

C. Create and configure a second Elastic Load Balancer to provide a redundant load balancer. 

D. Create a second multi-AZ RDS instance in another Availability Zone and configure replication to provide a redundant database. 

Answer:

Q146. – (Topic 3) 

A user has created a queue named “awsmodule” with SQS. One of the consumers of queue is down for 3 days and then becomes available. Will that component receive message from queue? 

A. Yes, since SQS by default stores message for 4 days 

B. No, since SQS by default stores message for 1 day only 

C. No, since SQS sends message to consumers who are available that time 

D. Yes, since SQS will not delete message until it is delivered to all consumers 

Answer:

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. Queues retain messages for a set period of time. By default, a queue retains messages for four days. However, the user can configure a queue to retain messages for up to 14 days after the message has been sent. 

Q147. – (Topic 3) 

A user has created an Auto Scaling group using CLI. The user wants to enable CloudWatch detailed monitoring for that group. How can the user configure this? 

A. When the user sets an alarm on the Auto Scaling group, it automatically enables detail monitoring 

B. By default detailed monitoring is enabled for Auto Scaling 

C. Auto Scaling does not support detailed monitoring 

D. Enable detail monitoring from the AWS console 

Answer:

Explanation: 

CloudWatch is used to monitor AWS as well as the custom services. It provides either basic or detailed monitoring for the supported AWS products. In basic monitoring, a service sends data points to CloudWatch every five minutes, while in detailed monitoring a service sends data points to CloudWatch every minute. To enable detailed instance monitoring for a new Auto Scaling group, the user does not need to take any extra steps. When the user creates an Auto Scaling launch config as the first step for creating an Auto Scaling group, each launch configuration contains a flag named InstanceMonitoring.Enabled. The default value of this flag is true. Thus, the user does not need to set this flag if he wants detailed monitoring. 

Q148. – (Topic 2) 

A user is launching an instance. He is on the “Tag the instance” screen. Which of the below mentioned 

information will not help the user understand the functionality of an AWS tag? 

A. Each tag will have a key and value 

B. The user can apply tags to the S3 bucket 

C. The maximum value of the tag key length is 64 unicode characters 

D. AWS tags are used to find the cost distribution of various resources 

Answer:

Explanation: 

AWS provides cost allocation tags to categorize and track the AWS costs. When the user applies tags to his AWS resources, AWS generates a cost allocation report as a comma-separated value (CSV file. with the usage and costs aggregated by those tags. Each tag will have a key-value and can be applied to services, such as EC2, S3, RDS, EMR, etc. The maximum size of a tag key is 128 unicode characters. 

Q149. – (Topic 2) 

A user has enabled the Multi AZ feature with the MS SQL RDS database server. Which of the below 

mentioned statements will help the user understand the Multi AZ feature better? 

A. In a Multi AZ, AWS runs two DBs in parallel and copies the data asynchronously to the replica copy 

B. In a Multi AZ, AWS runs two DBs in parallel and copies the data synchronously to the replica copy 

C. In a Multi AZ, AWS runs just one DB but copies the data synchronously to the standby replica 

D. AWS MS SQL does not support the Multi AZ feature 

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. The primary DB instance is synchronously replicated across Availability Zones to a standby replica to provide data redundancy, eliminate I/O freezes, and minimize latency spikes during system backups. Running a DB instance with high availability can enhance availability during planned system maintenance, and help protect your databases against DB instance failure and Availability Zone disruption.Note that the high-availability feature is not a scaling solution for read-only scenarios; you cannot use a standby replica to serve read traffic. To service read-only traffic, you should use a read replica. 

Q150. – (Topic 2) 

A user has created a VPC with CIDR 20.0.0.0/24. The user has created a public subnet with CIDR 20.0.0.0/25. The user is trying to create the private subnet with CIDR 20.0.0.128/25. Which of the below mentioned statements is true in this scenario? 

A. It will not allow the user to create the private subnet due to a CIDR overlap 

B. It will allow the user to create a private subnet with CIDR as 20.0.0.128/25 

C. This statement is wrong as AWS does not allow CIDR 20.0.0.0/25 

D. It will not allow the user to create a private subnet due to a wrong CIDR range 

Answer:

Explanation: 

When the user creates a subnet in VPC, he specifies the CIDR block for the subnet. The CIDR block of a subnet can be the same as the CIDR block for the VPC (for a single subnet in the VPC., or a subset (to enable multiple subnets.. If the user creates more than one subnet in a VPC, the CIDR blocks of the subnets must not overlap. Thus, in this case the user has created a VPC with the CIDR block 20.0.0.0/24, which supports 256 IP addresses (20.0.0.0 to 20.0.0.255.. The user can break this CIDR block into two subnets, each supporting 128 IP addresses. One subnet uses the CIDR block 20.0.0.0/25 (for addresses 20.0.0.0 – 20.0.0.127. and the other uses the CIDR block 20.0.0.128/25 (for addresses 20.0.0.128 – 20.0.0.255.. 

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