[2021-New] Amazon AWS-SysOps Dumps With Update Exam Questions (141-150)

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Q1. - (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: D

Q2. - (Topic 3)

An organization has setup Auto Scaling with ELB. Due to some manual error, one of the instances got

rebooted. Thus, it failed the Auto Scaling health check. Auto Scaling has marked it for replacement. How can the system admin ensure that the instance does not get terminated?

A. Update the Auto Scaling group to ignore the instance reboot event

B. It is not possible to change the status once it is marked for replacement

C. Manually add that instance to the Auto Scaling group after reboot to avoid replacement

D. Change the health of the instance to healthy using the Auto Scaling commands

Answer: D

Explanation:

After an instance has been marked unhealthy by Auto Scaling, as a result of an Amazon EC2 or ELB health check, it is almost immediately scheduled for replacement as it will never automatically recover its health. If the user knows that the instance is healthy then he can manually call the SetInstanceHealth action (or the as-setinstance- health command from CLI. to set the instance's health status back to healthy. Auto Scaling will throw an error if the instance is already terminating or else it will mark it healthy.

Q3. - (Topic 2)

A user is trying to delete an Auto Scaling group from CLI. Which of the below mentioned steps are to be performed by the user?

A. Terminate the instances with the ec2-terminate-instance command

B. Terminate the Auto Scaling instances with the as-terminate-instance command

C. Set the minimum size and desired capacity to 0

D. There is no need to change the capacity. Run the as-delete-group command and it will reset all values to 0

Answer: C

Explanation:

If the user wants to delete the Auto Scaling group, the user should manually set the values of the minimum and desired capacity to 0. Otherwise Auto Scaling will not allow for the deletion of the group from CLI. While trying from the AWS console, the user need not set

the values to 0 as the Auto Scaling console will automatically do so.

Q4. - (Topic 3)

A user has launched an EC2 instance store backed instance in the US-East-1a zone. The user created AMI #1 and copied it to the Europe region. After that, the user made a few updates to the application running in the US-East-1a zone. The user makes an AMI#2 after the changes. If the user launches a new instance in Europe from the AMI #1 copy, which of the below mentioned statements is true?

A. The new instance will have the changes made after the AMI copy as AWS just copies the reference of the original AMI during the copying. Thus, the copied AMI will have all the updated data

B. The new instance will have the changes made after the AMI copy since AWS keeps updating the AMI

C. It is not possible to copy the instance store backed AMI from one region to another

D. The new instance in the EU region will not have the changes made after the AMI copy

Answer: D

Explanation:

Within EC2, when the user copies an AMI, the new AMI is fully independent of the source AMI; there is no link to the original (source. AMI. The user can modify the source AMI without affecting the new AMI and vice a versa. Therefore, in this case even if the source AMI is modified, the copied AMI of the EU region will not have the changes. Thus, after copy the user needs to copy the new source AMI to the destination region to get those changes.

Q5. - (Topic 3)

Which of the below mentioned AWS RDS logs cannot be viewed from the console for MySQL?

A. Error Log

B. Slow Query Log

C. Transaction Log

D. General Log

Answer: C

Explanation:

The user can view, download, and watch the database logs using the Amazon RDS console, the Command Line Interface (CLI., or the Amazon RDS API. For the MySQL RDS, the user can view the error log, slow querylog, and general logs. RDS does not support viewing the transaction logs.

Q6. - (Topic 3)

A user has created a public subnet with VPC and launched an EC2 instance within it. The user is trying to

delete the subnet. What will happen in this scenario?

A. It will delete the subnet and make the EC2 instance as a part of the default subnet

B. It will not allow the user to delete the subnet until the instances are terminated

C. It will delete the subnet as well as terminate the instances

D. The subnet can never be deleted independently, but the user has to delete the VPC first

Answer: B

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 that subnet. When an instance is launched it will have a network interface attached with it. The user cannot delete the subnet until he terminates the instance and deletes the network interface.

Q7. - (Topic 3)

A user has launched multiple EC2 instances for the purpose of development and testing in the same region. The user wants to find the separate cost for the production and development instances. How can the user find the cost distribution?

A. The user should download the activity report of the EC2 services as it has the instance ID wise data

B. It is not possible to get the AWS cost usage data of single region instances separately

C. The user should use Cost Distribution Metadata and AWS detailed billing

D. The user should use Cost Allocation Tags and AWS billing reports

Answer: D

Explanation:

AWS provides cost allocation tags to categorize and track the AWS costs. When the user applies tags to his AWS resources (such as Amazon EC2 instances or Amazon S3 buckets., AWS generates a cost allocation report as a comma-separated value (CSV file. with the usage and costs aggregated by those tags. The user can apply tags which represent business categories (such as cost centres, application names, or instance type – Production/Dev. to organize usage costs across multiple services.

Q8. - (Topic 1)

You have an Auto Scaling group associated with an Elastic Load Balancer (ELB). You have noticed that instances launched via the Auto Scaling group are being marked unhealthy due to an ELB health check, but these unhealthy instances are not being terminated

What do you need to do to ensure trial instances marked unhealthy by the ELB will be terminated and replaced?

A. Change the thresholds set on the Auto Scaling group health check

B. Add an Elastic Load Balancing health check to your Auto Scaling group

C. Increase the value for the Health check interval set on the Elastic Load Balancer

D. Change the health check set on the Elastic Load Balancer to use TCP rather than HTTP checks

Answer: B

Explanation: Reference:

http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/as-add-elb-healthcheck.html

Add an Elastic Load Balancing Health Check to your Auto Scaling Group

By default, an Auto Scaling group periodically reviews the results of EC2 instance status to determine the health state of each instance. However, if you have associated your Auto Scaling group with an Elastic Load Balancing load balancer, you can choose to use the Elastic Load Balancing health check. In this case, Auto Scaling determines the health status of your instances by checking the results of both the EC2 instance status check and the Elastic Load Balancing instance health check.

For information about EC2 instance status checks, see.Monitor Instances With Status Checks.in the.Amazon EC2 User Guide for Linux Instances. For information about Elastic Load Balancing health checks, see.Health Check.in the.Elastic Load Balancing Developer Guide.

This topic shows you how to add an Elastic Load Balancing health check to your Auto Scaling group, assuming that you have created a load balancer and have registered the load balancer with your Auto Scaling group. If you have not registered the load balancer with your Auto Scaling group, see.Set Up a Scaled and Load-Balanced Application.

Auto Scaling marks an instance unhealthy if the calls to the Amazon EC2 action.DescribeInstanceStatus.return any state other than.running, the system status shows.impaired, or the calls to Elastic Load Balancing action.DescribeInstanceHealth.returns.OutOfService.in the instance state field.

If there are multiple load balancers associated with your Auto Scaling group, Auto Scaling checks the health state of your EC2 instances by making health check calls to each load balancer. For each call, if the Elastic Load Balancing action returns any state other than.InService, the instance is marked as unhealthy. After Auto Scaling marks an instance as unhealthy, it remains in that state, even if subsequent calls from other load balancers return an.InService.state for the same instance.

Q9. - (Topic 3)

A user is measuring the CPU utilization of a private data centre machine every minute. The machine provides the aggregate of data every hour, such as Sum of data”, “Min value”, “Max value, and “Number of Data points”.

The user wants to send these values to CloudWatch. How can the user achieve this?

A. Send the data using the put-metric-data command with the aggregate-values parameter

B. Send the data using the put-metric-data command with the average-values parameter

C. Send the data using the put-metric-data command with the statistic-values parameter

D. Send the data using the put-metric-data command with the aggregate –data parameter

Answer: C

Explanation:

AWS CloudWatch supports the custom metrics. The user can always capture the custom data and upload the data to CloudWatch using CLI or APIs. The user can publish the data to CloudWatch as single data points or as an aggregated set of data points called a statistic set using the command put-metric-data. When sending the aggregate data, the user needs to send it with the parameter statistic-values: awscloudwatch put-metric-data --metric-name <Name> --namespace <Custom namespace> --timestamp <UTC Format> --statistic-values Sum=XX,Minimum=YY,Maximum=AA,SampleCount=BB --unit Milliseconds

Q10. - (Topic 2)

A user is trying to understand AWS SNS. To which of the below mentioned end points is SNS unable to send a notification?

A. Email JSON

B. HTTP

C. AWS SQS

D. AWS SES

Answer: D

Explanation:

Amazon Simple Notification Service (Amazon SNS. is a fast, flexible, and fully managed push messaging service. Amazon SNS can deliver notifications by SMS text message or email to the Amazon Simple Queue Service (SQS. queues or to any HTTP endpoint. The user can select one the following transports as part of the subscription requests: “HTTP”, “HTTPS”,”Email”, “Email-JSON”, “SQS”, “and SMS”.