Alibaba ACA-Cloud1 Exam Practice Test Instant Access

Question 1

Which of the following statements is wrong when comparing RDS with self-built database?

ARDS features a high availability of 99.95% while self-built database requires you to implement data protection, primary-standby replication, and RAID all by yourself.

BRDS provides automatic backup while self-built database requires you to prepare storage space for backup copies and regularly verify that these copies can be restored.

CSelf-built database supports quick deployment and elastic scaling.

DRDS requires no O&M while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.

Answer : C

ApsaraDB RDS is a cloud-based relational database service that provides secure, cost-effective, and scalable database solutions for various applications. RDS has many advantages over self-built databases, such as high availability, automatic backup, and easy O&M. One of the statements that is wrong when comparing RDS with self-built database is that self-built database supports quick deployment and elastic scaling. This is not true, because self-built database requires users to purchase, install, and configure hardware and software by themselves, which can be time-consuming and complex. Moreover, self-built database cannot easily adjust the computing and storage resources according to the business needs, which can lead to over-provisioning or under-provisioning. RDS, on the other hand, supports quick deployment and elastic scaling, because users can create, modify, or delete RDS instances in minutes through the console or API. Users can also scale up or down the RDS instance specifications, storage capacity, or network bandwidth without affecting the business continuity.

ApsaraDB RDS

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Which of the following statements is NOT correct, when comparing RDS ...

Question 2

Which of the following scenarios is applicable to use RDS read-only instances?

AReduces the write pressure on the RDS primary instance.

BReduces the read pressure on the RDS primary instance.

CImplements data backtracking for the last two days.

DImproves RDS storage capabilities.

Answer : B

ApsaraDB RDS for MySQL is a cloud-based relational database service that provides secure, cost-effective, and scalable database solutions for various applications. RDS for MySQL supports creating read-only instances that are synchronized with the primary instance in real time. Read-only instances can handle read requests from applications and reduce the read pressure on the primary instance. This can improve the performance and availability of the database system. Read-only instances can also be used for scenarios such as report analysis, data backup, and disaster recovery.

Overview of read-only ApsaraDB RDS for MySQL instances

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Alibaba Cloud Computing Exam Question 2022

Question 3

Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. Which of the following is not the feature supported by Alibaba Cloud Auto Scaling?

AElastic Scale-Out

BElastic Scale-In

CElastic Self-Health

DElastic Self-Diagnostic

Answer : D

Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies.Auto Scaling supports the following features12:

Elastic Scale-Out: Automatically adds ECS instances to handle increased workloads.

Elastic Scale-In: Automatically removes ECS instances to reduce costs when workloads decrease.

Elastic Self-Health: Automatically replaces unhealthy ECS instances to ensure high availability and reliability.

Scheduled Scaling: Automatically adds or removes ECS instances based on predefined schedules.

Predictive Scaling: Automatically predicts future workloads and adjusts ECS instances accordingly.

Elastic Self-Diagnostic is not a feature supported by Alibaba Cloud Auto Scaling.It is a fictitious term that does not exist in the Alibaba Cloud documentation or course materials.Reference:1: Auto Scaling: Automatically Adjusts Computing Resources - Alibaba Cloud2: Auto Scaling:What is Auto Scaling? - Alibaba Cloud

Question 4

You can an ECS instance's configuration. (Choose two.)

Aupgraded

Bdowngraded

Cdownloaded

Duploaded

Answer : A, B

You can upgrade or downgrade an ECS instance's configuration to meet your business needs. Upgrading an instance's configuration means increasing the vCPUs, memory, bandwidth, or disk capacity of the instance. Downgrading an instance's configuration means decreasing the vCPUs, memory, bandwidth, or disk capacity of the instance.You can change the configuration of an ECS instance by using one of the following methods1:

Change the instance type: You can change the instance type of an ECS instance to adjust the vCPUs and memory of the instance.You can change the instance type of an ECS instance in the following scenarios2:

The instance is in theStoppedstate and uses apay-as-you-gobilling method.

The instance is in theRunningstate and uses asubscriptionbilling method, and the new instance type belongs to the same instance family as the original instance type.

Change the bandwidth configuration: You can change the bandwidth configuration of an ECS instance to adjust the network performance of the instance.You can change the bandwidth configuration of an ECS instance in the following scenarios3:

The instance is in theStoppedstate and uses apay-as-you-gobilling method, and the instance is not associated with an EIP.

The instance is in theRunningstate and uses asubscriptionbilling method, and the instance is not associated with an EIP.

Change the system disk or data disk: You can change the system disk or data disk of an ECS instance to adjust the disk capacity or performance of the instance.You can change the system disk or data disk of an ECS instance in the following scenarios4:

The instance is in theStoppedstate and uses apay-as-you-gobilling method, and the disk is not encrypted.

The instance is in theRunningstate and uses asubscriptionbilling method, and the disk is not encrypted.Reference:1:Overview of instance configuration changes - Alibaba Cloud2:Change the instance type of an ECS instance - Alibaba Cloud3:Change the bandwidth configuration of an ECS instance - Alibaba Cloud4:Change the system disk or data disk of an ECS instance - Alibaba Cloud.

Question 5

When using Alibaba Cloud SLB, you can set different weights for backend ECS instances. The higher the weight of a backend ECS instance, the more load will be assigned to it. If an SLB instance has 5 ECS instances in the backend server pool, all of which are healthy. Among these 5 ECS instances, the weight of ecs_inst1 is set to 100. Which of the following statements is correct?

AWe do not know the weight settings of the remaining 4 ECS instances, so we cannot tell what would happen.

B100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.

CBased on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.

DBased on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1.

Answer : A

Alibaba Cloud Server Load Balancer (SLB) is a service that distributes network traffic across multiple ECS instances to improve the service capabilities of applications. SLB supports different load balancing algorithms, such as round robin, weighted round robin, and least connections. When using the weighted round robin algorithm, SLB assigns different weights to backend ECS instances based on their processing capabilities. The higher the weight of a backend ECS instance, the more requests it will receive from SLB. However, the weight of a backend ECS instance is not the only factor that determines the load distribution. The number and the weight of other backend ECS instances in the same server group also affect the load balancing result. Therefore, without knowing the weight settings of the remaining 4 ECS instances, we cannot tell what would happen to the load distribution among the 5 ECS instances. The other statements are incorrect because they assume a fixed or proportional load distribution based on the weight of ecs_inst1, which is not necessarily true.

Alibaba Cloud Server Load Balancer

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Alibaba Cloud Computing Exam Question 2022

Question 6

Alibaba Cloud does not support Intranet communication between products that are not in the same region, which does not mean ?

AECS instances in different regions cannot communicate with each other on the intranet.

BECS instances and other products in different regions, such as ApsaraDB for RDS and OSS instances, cannot communicate with each other on the intranet.

CServer Load Balancer cannot be deployed for ECS instances in various regions.

DServer Load Balancer can be deployed for ECS instances in various regions.

Answer : D

Alibaba Cloud does not support intranet communication between products that are not in the same region, which means that ECS instances in different regions cannot communicate with each other on the intranet, and ECS instances and other products in different regions, such as ApsaraDB for RDS and OSS instances, cannot communicate with each other on the intranet. However, this does not mean that Server Load Balancer cannot be deployed for ECS instances in various regions. Server Load Balancer is a service that distributes traffic among multiple ECS instances according to the configured forwarding rules. It can be used to balance the load and improve the service availability and fault tolerance of applications.Server Load Balancer supports cross-region deployment, which means that it can distribute traffic to ECS instances in different regions12.Reference:1: ACA Cloud Computing Exam Preparation Course - Alibaba Cloud32: Server Load Balancer - Alibaba Cloud Documentation Center4

Question 7

When we talk about the 'Elastic' feature for ECS product, we are not talking about .

AElastic Computing

BElastic Storage

CElastic Network

DElastic Administration

Answer : D

Elastic Computing Service (ECS) is a cloud computing service that provides scalable, on-demand computing resources for cloud applications. ECS offers elastic computing, elastic storage, and elastic network features to meet different business needs. However, ECS does not provide elastic administration, which means that the management and configuration of ECS resources are not automatically adjusted according to the workload or demand. Users need to manually create, modify, or delete ECS instances, disks, snapshots, security groups, and other resources. Users can also use other Alibaba Cloud services, such as Auto Scaling, Server Load Balancer, and Cloud Monitor, to enhance the elasticity and availability of ECS.

[Alibaba Cloud Elastic Compute Service]

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