Alibaba ACA Cloud Computing Associate ACA-Cloud1 Exam Questions

Answer : D

Alibaba Cloud provides anti-DDoS products of different levels to protect your applications and data from DDoS attacks. Among them, Anti-DDoS Service Pro is the most suitable product for ensuring high service availability under DDoS attacks.Anti-DDoS Service Pro is a proxy-based mitigation service that diverts network traffic to the Alibaba Cloud global anti-DDoS network through DNS resolution, mitigates volumetric DDoS attacks and resource exhaustion DDoS attacks, and ensures the stability and availability of your origin servers1.Anti-DDoS Service Pro provides the following features and benefits2:

Over 10 Tbit/s mitigation capacity: Anti-DDoS Service Pro can defend against large-scale DDoS attacks at the Tbit/s level and ensure high service availability.

AI-enabled for mitigating sophisticated attacks: Anti-DDoS Service Pro can automatically detect and mitigate sophisticated DDoS attacks, such as HTTP flood, HTTPS flood, and DNS flood, and quickly adjust protection policies based on the attack characteristics.

Hiding origin server IPs: Anti-DDoS Service Pro can hide the IP addresses of your origin servers and prevent attackers from bypassing the proxy and directly attacking your origin servers.

Multiple protection modes: Anti-DDoS Service Pro supports normal protection mode, emergency protection mode, and always-on protection mode, which can be switched based on your business needs and risk levels.

Comprehensive security reports: Anti-DDoS Service Pro provides comprehensive security reports that display the attack details, protection status, and traffic statistics of your protected domains.Reference:1:Anti-DDoS: Intelligent DDoS Protection Service - Alibaba Cloud2:Anti-DDoS Pro and Anti-DDoS Premium features - Anti-DDoS Pro and Anti-DDoS Premium - Alibaba Cloud Documentation Center.

Answer : A

Alibaba Cloud OSS service provides different methods for file uploading, such as simple upload, multipart upload, append upload, and resumable upload1. However, not all of these methods support resuming from break point, which is a feature that allows you to resume an interrupted upload from where it left off.The only method that supports resuming from break point is resumable upload, which is based on multipart upload and uses a checkpoint file to record the upload progress2. The other methods do not support resuming from break point, and will either overwrite or append to the existing object if the upload is interrupted and retried.

Answer : D

RDS (Relational Database Service) is a fully managed online database service that supports various database engines, such as MySQL, SQL Server, PostgreSQL, MariaDB, and PPAS (PostgreSQL with Oracle compatibility)1.However, RDS does not support Oracle database, which is a proprietary database system developed by Oracle Corporation2.If you need to use Oracle database on Alibaba Cloud, you can deploy it on an ECS instance or use the Oracle Database Backup Service3.

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.

Answer : C

According to the Alibaba Cloud Academy, Auto Scaling is a service that automatically creates and releases ECS instances based on pre-defined rules in order to scale services to match demand. Furthermore, it can configure server load balancer and relational database service white lists, without any manual intervention. Therefore, when ECS is used with Auto Scaling, the number of ECS instances is automatically adjusted based on traffic.Reference:Introduction to Alibaba Auto Scaling - Cloud Academy,ACA Cloud Computing Exam Preparation Course - Alibaba Cloud, Module 4: Cloud Computing Elasticity, Lesson 1: Auto Scaling, Slide 2.

Answer : A, B, C

When using Alibaba Cloud OSS, you can set access control in three different levels, which are bucket level, object level, and RAM account level. Bucket level access control is the highest level of access control, which determines whether a user can access the bucket and its objects. Bucket level access control can be set to public read/write, public read, or private. Object level access control is the second level of access control, which determines whether a user can access a specific object in the bucket. Object level access control can be set to inherit from the bucket, public read/write, public read, or private. RAM account level access control is the lowest level of access control, which determines whether a user can perform certain operations on the bucket or the object. RAM account level access control can be set by using RAM policies, which specify the actions, resources, and conditions for the access.Reference:Object Storage Service (OSS) - Alibaba Cloud Academy,Access Control - Alibaba Cloud Documentation Center

Answer : C

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ACA-Cloud1 Alibaba Exam Questions and Answers - CertLibrary