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April 21, 2017

Top 10 ebook AWS-SysOps for candidates (151 to 160)

Q151. - (Topic 3) 

Which services allow the customer to retain run administrative privileges or the undertying EC2 instances? Choose 2 answers 

A. AWS Elastic Beanstalk 

B. Amazon Elastic Map Reduce 

C. Elastic Load Balancing 

D. Amazon Relational Database Service 

E. Amazon Elasti Cache 

Answer: A,B 


Q152. - (Topic 3) 

A user has launched an EC2 instance and deployed a production application in it. The user wants to prohibit any mistakes from the production team to avoid accidental termination. 

How can the user achieve this? 

A. The user can the set DisableApiTermination attribute to avoid accidental termination 

B. It is not possible to avoid accidental termination 

C. The user can set the Deletion termination flag to avoid accidental termination 

D. The user can set the InstanceInitiatedShutdownBehavior flag to avoid accidental termination 

Answer:

Explanation: 

It is always possible that someone can terminate an EC2 instance using the Amazon EC2 console, command line interface or API by mistake. If the admin wants to prevent the instance from being accidentally terminated, he can enable termination protection for that instance. The DisableApiTermination attribute controls whether the instance can be terminated using the console, CLI or API. By default, termination protection is disabled for an EC2 instance. When it is set it will not allow the user to terminate the instance from CLI, API or the console. 


Q153. - (Topic 2) 

A user is trying to setup a recurring Auto Scaling process. The user has setup one process to scale up every day at 8 am and scale down at 7 PM. The user is trying to setup another recurring process which scales up on the 1st of every month at 8 AM and scales down the same day at 7 PM. What will Auto Scaling do in this scenario? 

A. Auto Scaling will execute both processes but will add just one instance on the 1st 

B. Auto Scaling will add two instances on the 1st of the month 

C. Auto Scaling will schedule both the processes but execute only one process randomly 

D. Auto Scaling will throw an error since there is a conflict in the schedule of two separate Auto Scaling Processes 

Answer:

Explanation: 

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. As per Auto Scaling, a scheduled action must have a unique time value. If the user attempts to schedule an activity at a time when another existing activity is already scheduled, the call will be rejected with an error message noting the conflict. 


Q154. - (Topic 2) 

A user has recently started using EC2. The user launched one EC2 instance in the default subnet in EC2-VPC Which of the below mentioned options is not attached or available with the EC2 instance when it is launched? 

A. Public IP address 

B. Internet gateway 

C. Elastic IP 

D. Private IP address 

Answer:

Explanation: 

A Virtual Private Cloud (VPC. is a virtual network dedicated to a user’s AWS account. A subnet is a range of IP addresses in the VPC. The user can launch the AWS resources into a subnet. There are two supported platforms into which a user can launch instances: EC2-Classic and EC2-VPC (default subnet.. A default VPC has all the benefits of EC2-VPC and the ease of use of EC2-Classic. Each instance that the user launches into a default subnet has a private IP address and a public IP address. These instances can communicate with the internet through an internet gateway. An internet gateway enables the EC2 instances to connect to the internet through the Amazon EC2 network edge. 


Q155. - (Topic 3) 

A user is configuring a CloudWatch alarm on RDS to receive a notification when the CPU utilization of RDS is higher than 50%. The user has setup an alarm when there is some inactivity on RDS, such as RDS unavailability. How can the user configure this? 

A. Setup the notification when the CPU is more than 75% on RDS 

B. Setup the notification when the state is Insufficient Data 

C. Setup the notification when the CPU utilization is less than 10% 

D. It is not possible to setup the alarm on RDS 

Answer:

Explanation: 

Amazon CloudWatch alarms watch a single metric over a time period that the user specifies and performs one or more actions based on the value of the metric relative to a given threshold over a number of time periods. The alarm has three states: Alarm, OK and Insufficient data. The Alarm will change to Insufficient Data when any of the three situations arise: when the alarm has just started, when the metric is not available or when enough data is not available for the metric to determine the alarm state. If the user wants to find that RDS is not available, he can setup to receive the notification when the state is in Insufficient data. 


Q156. - (Topic 1) 

You have decided to change the Instance type for instances running In your application tier that are using Auto Scaling. 

In which area below would you change the instance type definition? 

A. Auto Scaling launch configuration 

B. Auto Scaling group 

C. Auto Scaling policy 

D. Auto Scaling tags 

Answer:

Explanation: Reference: 

http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/WhatIsAutoScaling.html 


Q157. - (Topic 1) 

Which of the following requires a custom CloudWatch metric to monitor? 

A. Data transfer of an EC2 instance 

B. Disk usage activity of an EC2 instance 

C. Memory Utilization of an EC2 instance 

D. CPU Utilization of an EC2 instance 

Answer:

Explanation: Reference: 

http://aws.amazon.com/cloudwatch/ 


Q158. - (Topic 2) 

A user has launched an EC2 instance. The user is planning to setup the CloudWatch alarm. Which of the 

below mentioned actions is not supported by the CloudWatch alarm? 

A. Notify the Auto Scaling launch config to scale up 

B. Send an SMS using SNS 

C. Notify the Auto Scaling group to scale down 

D. Stop the EC2 instance 

Answer:

Explanation: 

A user can create a CloudWatch alarm that takes various actions when the alarm changes state. An alarm watches a single metric over the time period that the user has specified, and performs one or more actions based on the value of the metric relative to a given threshold over a number of time periods. The actions could be sending a notification to an Amazon Simple Notification Service topic (SMS, Email, and HTTP end point.,notifying the Auto Scaling policy or changing the state of the instance to Stop/Terminate. 


Q159. - (Topic 3) 

A user is displaying the CPU utilization, and Network in and Network out CloudWatch metrics data of a single instance on the same graph. The graph uses one Y-axis for CPU utilization and Network in and another Y-axis for Network out. Since Network in is too high, the CPU utilization data is not visible clearly on graph to the user. How can the data be viewed better on the same graph? 

A. It is not possible to show multiple metrics with the different units on the same graph 

B. Add a third Y-axis with the console to show all the data in proportion 

C. Change the axis of Network by using the Switch command from the graph 

D. Change the units of CPU utilization so it can be shown in proportion with Network 

Answer:

Explanation: 

Amazon CloudWatch provides the functionality to graph the metric data generated either by the AWS services or the custom metric to make it easier for the user to analyse. It is possible to show the multiple metrics with different units on the same graph. If the graph is not plotted properly due to a difference in the unit data over two metrics, the user can change the Y-axis of one of the graph by selecting that graph and clicking on the Switch option. 


Q160. - (Topic 1) 

You are running a database on an EC2 instance, with the data stored on Elastic Block Store (EBS) for persistence At times throughout the day, you are seeing large variance in the response times of the database queries Looking into the instance with the isolate command you see a lot of wait time on the disk volume that the database's data is stored on. 

What two ways can you improve the performance of the database's storage while maintaining the current persistence of the data? 

Choose 2 answers 

A. Move to an SSD backed instance 

B. Move the database to an EBS-Optimized Instance 

C. T Use Provisioned IOPs EBS 

D. Use the ephemeral storage on an m2 4xiarge Instance Instead 

Answer: A,B 



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