QUESTION: 69

Auto Scaling can automatically adjust the number of ECS instances based on user-defined scaling rules to meet service needs. If a user cannot predict service changes or does not have enough history data, he/she can still use dynamic scaling mode to automatically add/remove ECS instances based on certain Cloud Monitor performance metrics (such as the CPU utilization rate)

True
False

Answer(s): A

Explanation:

Auto Scaling is a service that automatically adjusts the number of ECS instances based on your business needs and policies. You can use Auto Scaling to cope with unpredictable or periodic workloads. Auto Scaling supports three scaling modes: scheduled, dynamic, and fixed. Dynamic scaling mode allows you to automatically add or remove ECS instances based on CloudMonitor metrics, such as CPU utilization, memory utilization, inbound traffic, and outbound traffic. You can configure scaling rules and scaling policies to define the conditions and actions for dynamic scaling. For example, you can set a scaling rule to add one ECS instance when the average CPU utilization of the scaling group exceeds 80% for five consecutive minutes. Dynamic scaling mode is suitable for scenarios where you cannot predict service changes or do not have enough historical data to set a schedule.

Reference:

1: Auto Scaling overview - Auto Scaling - Alibaba Cloud Documentation Center1

2: Scaling modes - Auto Scaling - Alibaba Cloud Documentation Center2

3: Create a scaling rule - Auto Scaling - Alibaba Cloud Documentation Center3

4: Auto Scaling: Automatically Adjusts Computing Resources - Alibaba Cloud5

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QUESTION: 70

Many of Alibaba Cloud services provide highly reliable data storage capacity. For example, Object Storage Service (OSS) promises that its data reliability is no less than 99 99999999%. This high data reliability is solely achieved by RAID 0+1 redundancy technology.

True
False

Answer(s): B

Explanation:

Alibaba Cloud Object Storage Service (OSS) does not solely rely on RAID 0+1 redundancy technology to achieve high data reliability. OSS uses a distributed system architecture to store data across multiple devices and servers. OSS also supports cross-region replication (CRR) to replicate data across different regions for disaster recovery. OSS is designed for 99.9999999999% (12 9's) data durability and 99.995% service availability.

Reference:

Object Storage Service (OSS) - Alibaba Cloud

What is OSS? - Object Storage Service - Alibaba Cloud Documentation Center

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QUESTION: 71

When you initiate a request via an Open API provided by Alibaba Cloud Elastic Compute Service (ECS), whether the request is initiated successfully or not, the server will return

______________________ as a unique identifier.

Messageld
Requestld
Responseld
Time stamp

Answer(s): B

Explanation:

In Alibaba Cloud ECS, whenever an API request is made, a unique identifier called the RequestId is generated and returned. This ID is generated regardless of the request's success or failure. RequestId serves as a unique identifier for tracking and debugging specific requests within the ECS environment, allowing users to trace and troubleshoot individual API calls. This practice ensures that issues can be resolved more efficiently by tracking the specific request, and it is a common practice across many Alibaba Cloud services.

Reference:

Alibaba Cloud ECS API Documentation

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QUESTION: 72

In some cases, you can purchase Elastic Compute Service (ECS) instances in Pay-As-You-Go mode to meet the demands for requiring additional computing resources in a particular period of time and set an auto-release time to release these Pay-As-You-Go instances later. ___________________ is a correct description of this operation.

You can set the auto-release time only when creating the Elastic Compute Service (ECS) instance
You can set the auto-release time of the ECS instance once
You can set the auto-release time of the ECS instance multiple times
You cannot cancel the set auto-release time of the ECS instance

Answer(s): C

Explanation:

Alibaba Cloud ECS allows users to set an auto-release time for Pay-As-You-Go instances, giving flexibility in handling temporary workloads without manually releasing instances. Notably, the auto- release time can be adjusted multiple times even after the instance has been created, allowing for modifications as business needs change. This feature provides a convenient way to manage costs by automatically releasing instances when they are no longer needed. However, once the auto-release time is set, it must be adjusted or canceled if changes are required.

Reference:

Alibaba Cloud ECS Instance Auto-Release

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QUESTION: 69

Explanation:

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Explanation:

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Explanation:

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QUESTION: 72

Explanation:

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