Manage and Operate Auto Scaling – Quiz » Tao Cloud Academy

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Lesson 5: Cloud Computing Fundamentals – Auto Scaling

1. Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. Its key functions are ( ). (Number of correct answers: 3)

Upgrades or downgrades the configuration (including the memory size and CPU) of a single ECS instance based on users’ business needs.

Supports the apsaradb for RDS whitelist to automatically add the IP addresses of ECS instances or remove them from the ApsaraDB for RDS whitelist.

Horizontally adjusts ECS instances based on users’ business needs, namely adds or reduces ECS instances automatically.

Supports configuring slb to automatically add ECS instances or remove them from SLB instances.

2. A customer uses Alibaba Cloud Auto Scaling service and creates a scaling group. He sets the “Minimum number of instances” to 6 and “Maximum number of instances” to 8.
After correctly configuring scaling settings, the customer adds a scaling rule “Adjust to 10 ECS instances”, and creates a scheduled task based on this rule.
And then, the customer checks the scaling group and see it already contains 6 valid ECS instances, he then enables this scaling group immediately.
How many ECS instance are left in the scaling group when the scheduled task is activated once?

Five

Eight

Six

Ten

3. A scaling group in Auto Scaling refers to the collection of ECS instances with the same application scenario. Which of the following must be configured when creating a scaling group? (Number of correct answers: 3)

Cool-down Time

Scaling MaxSize and MinSize

Scheduled/Event-triggered task

region of scaling group

4. Auto Scaling is a management service that can automatically adjusts elastic computing resources based on your business needs and policies. It supports adding existing ECS instances into the scaling group, whose status must be ________.

Running

Created

Preparing

Stopped

5. In Auto Scaling, the cool-down time of a scaling group refers to the lockout period after a scaling activity has been executed successfully. Which of the following statements about cool-down time are true? (Number of correct answers: 3)

During the cool-down time of a scaling group, only the alarms from cloudmonitor can bypass the cool-down time and trigger scaling activities, whereas others will still subject to the cool-down time, such as the manually triggered scaling activities.

During the cool-down time, only the scaling activities in the same scaling group are locked.

When a scaling group meets the cool-down time, you can abort the cool-down time by disabling and then restarting the scaling group.

When multiple ECS instances are added or removed from a scaling group, the cool-down time begins only when the last instance has been added or removed from the scaling group.

6. When using Auto Scaling, you want to execute a task at a specific time such as removing 1 ECS instance every night at 00:00. To achieve this, which of the following operations should be performed? (Number of correct answers: 2)

Create a scaling rule.

Create an event-triggered task.

Manually remove this the ECS instance from console.

Create a scheduled task.

7. Two modes are available for deleting scaling groups in Auto Scaling: ForceDelete mode and non-ForceDelete mode. Which of the following conditions must be met in non-ForceDelete mode? (Number of correct answers: 2)

No ECS instances exist in the scaling group.

The scaling group is not working in conjunction with SLB and ApsaraDB for RDS.

No scaling activities are ongoing in the scaling group.

No scheduled tasks and event-triggered tasks exist in the scaling group.

8. There are scheduled tasks and event-triggered tasks in Auto Scaling. About event-triggered tasks, which of the following metrics are supported for this type of tasks? (Number of correct answers: 4)

Memory utilization rate

Average system workload

Disk IOPS

CPU workload

Inbound and outbound traffic

9. When using Auto Scaling, you have to create scaling group, scaling configuration, scaling rule, scheduled task and event-triggered task. When a task is created, the task will be triggered according to the pre-defined condition. Which of the following conditions can trigger a task? (Number of correct answers: 2)

The average IOPS of all the ECS instances in the scaling group is less than 100.

The maximum CPU utilization rate of all the ECS instances in the scaling group is greater than 60%.

The user-defined activity execution time is met.

More than 50% of the requests responded by all the ECS instances in the scaling group are write requests.

10. A video streaming company uses SLB to distribute user requests to 30 ECS instances (the 30 ECS instances have the same configuration). Yet, the company finds that the service traffic soars dramatically every night from 20:00 to 02:00. According to their calculation, the evening traffic is 100% higher than the traffic in other periods of time. To properly respond to user requests, which of the following methods is most preferred from the perspective of cost and implementation simplicity?

Configure Auto Scaling to automatically upgrade and downgrade the ECS instances.

Create 30 ECS instances based on the custom image and add them to SLB. Then, configure weights for these ECS instances to respond to user requests every night from 20:00 to 02:00, and reset those weights to zero for other periods of time.

Configure Auto Scaling to automatically add or reduce ECS instances.

Manually create 30 ECS instances using the custom image, and then add them to SLB every night before 20:00 and remove them after 02:00.

Manage and Operate Auto Scaling – Quiz

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