AWS Certified SysOps Administrator(SOA-C02)

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Topic 1 - Exam A

Question #6 Topic 1

A user has launched an EC2 instance from an instance store backed AMI. If the user restarts the instance, what will happen to the ephemeral storage data?

  • A All the data will be erased but the ephemeral storage will stay connected
  • B All data will be erased and the ephemeral storage is released
  • C It is not possible to restart an instance launched from an instance store backed AMI
  • D The data is preserved
Suggested Answer: D
NOTE: 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 Amazon EC2 to reboot the instance instead of running the operating system reboot command from the instance. When an instance launched from an instance store backed AMI is rebooted all the ephemeral storage data is still preserved.
Question #7 Topic 1

Which of the following is an incorrect statement about Amazon CloudWatch?

  • A You can use CloudWatch to collect and track metrics, which are the variables you want to measure for your resources and applications.
  • B You can set CloudWatch alarms to send notifications or automatically make changes to the resources you are monitoring, based on rules that you define.
  • C You can control and monitor all Security Groups and their related rules.
  • D You gain system-wide visibility into resource utilization, application performance, and operation-al health.
Suggested Answer: C
NOTE: Amazon CloudWatch monitors your Amazon Web Services (AWS) resources and the applications you run on AWS in real-time. You can use CloudWatch to collect and track metrics, which are the variables you want to measure for your resources and applications. CloudWatch alarms send notifications or automatically make changes to the resources you are monitoring based on rules that you define. For example, you can monitor the CPU usage and disk reads and writes of your Amazon Elastic Compute Cloud (Ama-zon EC2) instances and then use this data to determine whether you should launch additional in-stances to handle increased load. You can also use this data to stop under-used instances to save money. In addition to monitoring the built-in metrics that come with AWS, you can monitor your own custom metrics. With CloudWatch, you gain system-wide visibility into resource utilization, application performance, and operational health. Reference: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/WhatIsCloudWatch.html
Question #8 Topic 1

A user is aware that a huge download is occurring on his instance. He has already set the Auto Scal-ing policy to increase the instance count when the network I/ O increases beyond a certain limit. How can the user ensure that this temporary event does not result in scaling?

  • A The policy cannot be set on the network I/O
  • B There is no way the user can stop scaling as it is already configured
  • C The network I/O are not affected during data download
  • D He can suspend scaling temporarily
Suggested Answer: D
NOTE: The user may want to stop the automated scaling processes on the Auto Scaling groups either to perform manual operations or during emergency situations. To perform this, the user can suspend one or more scaling processes at any time. Once it is completed, the user can resume all the suspend-ed processes. Reference: http://docs.aws.amazon.com/autoscaling/latest/userguide/as-suspend-resume-processes.html
Question #9 Topic 1

A system admin wants to add more zones to the existing ELB. The system admin wants to perform this activity from CLI. Which of the below mentioned command helps the system admin to add new zones to the existing ELB?

  • A elb-enable-zones-for-lb
  • B elb-add-zones-for-lb
  • C It is not possible to add more zones to the existing ELB
  • D elb-configure-zones-for-lb
Suggested Answer: A
NOTE: The user has created an Elastic Load Balancer with the availability zone and wants to add more zones to the existing ELB. The user can do so in two ways: 1. From the console or CLI 2. add new zones to ELB
Question #10 Topic 1

When rebalancing, Auto Scaling launches new instances before terminating the old ones, so that re-balancing does not compromise the performance or availability of your application. Because Auto Scaling attempts to launch new instances before terminating the old ones, being at or near the speci-fied maximum capacity could impede or completely halt rebalancing activities. What does Auto Scaling do in order to avoid this problem?

  • A It can temporarily exceed the specified maximum capacity of a group by a 20 percent margin (or by a 2-instance margin, whichever is greater) during a rebalancing activity.
  • B It can add new reserved instances you have defined.
  • C It can temporarily exceed the specified maximum capacity of a group by a 10 percent margin (or by a 1-instance margin, whichever is greater) during a rebalancing activity.
  • D It can temporarily exceed the specified maximum capacity of a group by a 5 percent margin (or by a 1-instance margin, whichever is greater) during a rebalancing activity.
Suggested Answer: C
NOTE: When rebalancing, Auto Scaling launches new instances before terminating the old ones, so that re-balancing does not compromise the performance or availability of your application. Because Auto Scaling attempts to launch new instances before terminating the old ones, being at or near the speci-fied maximum capacity could impede or completely halt rebalancing activities. To avoid this prob-lem, the system can temporarily exceed the specified maximum capacity of a group by a 10 percent margin (or by a 1-instance margin, whichever is greater) during a rebalancing activity. Reference: http://docs.aws.amazon.com/autoscaling/latest/userguide/auto-scaling-benefits.html
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