ACA-Cloud1 ACA Cloud Computing Associate Questions and Answers

A bucket is a container for objects in Object Storage Service (OSS). Every user can create more than one bucket, but every bucket should have a unique name in OSS. There is no limitation to the number of objects inside one bucket. However, the bucket name cannot be changed after creation.  You cannot customize, change, or request a namespace name change 1 .  If you want to modify an object, you must upload a new object with the same name as the existing one to replace it 2 .  References:   3 : Create a bucket - Object Storage Service - Alibaba Cloud 3   4 : Manage objects in a versioning-enabled bucket - Object Storage Service - Alibaba Cloud 4   1 : Understanding Object Storage Namespaces - Oracle 1   2 : OSS Concepts - Alibaba Object Storage Service Course - Cloud Academy 2

Using a cloud computing service is simple and straightforward. One can choose the instance with desired specification, finish payment and then use it right away. Moreover, the underlying physical machines are managed by cloud service providers and transparent to users.  This is the basic concept of cloud computing, which provides on-demand, scalable, and reliable computing resources and services over the internet 1 2 .  References:   1 : ACA Cloud Computing Exam Preparation Course - Alibaba Cloud 3   2 : What Is Alibaba Cloud Academy Certification? 4

According to the Alibaba Cloud Academy, Alibaba Cloud OSS is a cloud storage service that features massive capacity, outstanding security, low cost, and high reliability. To control the access to the files stored on OSS, OSS provides multiple access permissions for each bucket. These bucket permissions are:

Public-read-write : Anyone, including anonymous users, can perform read and write operations on the objects in the bucket. The owner of the bucket is charged for the requests and traffic generated by these operations. This permission poses a high security risk and is not recommended.

Public-read : Only the owner of the bucket and authorized RAM users can perform write operations on the objects in the bucket. Anyone, including anonymous users, can perform read operations on the objects in the bucket. The owner of the bucket is charged for the requests and traffic generated by these operations.

Private : Only the owner of the bucket and authorized RAM users can perform read and write operations on the objects in the bucket. Other users, including anonymous users, are denied access to the objects in the bucket unless they have been granted temporary access permissions by the bucket owner or authorized RAM users.

Therefore, the options B, C, and D are the correct answers that describe the bucket permissions in OSS.  References:   OSS Security - Alibaba Object Storage Service Course - Cloud Academy ,  OSS Concepts - Alibaba Cloud Documentation Center

Server Load Balancer (SLB) is a ready-to-use service that seamlessly integrates with Elastic Compute Service (ECS) to manage varying traffic levels without manual intervention.  SLB distributes incoming traffic among multiple ECS instances according to the configured forwarding rules, increasing the service capabilities and fault tolerance of your applications 1 .  SLB supports Layer-4 (TCP/UDP) and Layer-7 (HTTP/HTTPS) load balancing, health checks, session persistence, cross-zone disaster recovery, and other advanced features 2 .

References :  1 : Alibaba Cloud Academy, “Server Load Balancer”, https://edu.alibabacloud.com/elearning/lesson/ACA-Cloud-Computing-Certification/lesson-4-server-load-balancer  2 : Alibaba Cloud, “What is Server Load Balancer?”, https://www.alibabacloud.com/help/doc-detail/27539.htm

An ICP license is a permit issued by the Chinese Ministry of Industry and Information Technology (MIIT) that allows websites to operate in China. An ICP license is required for any website that is hosted on a mainland China server, or that wants to use a China-based CDN service to accelerate its access in China. Therefore, you would need to apply an ICP license in the following cases:

Accelerate your Overseas Website in China: If you have a website that is hosted outside of China, but you want to use Alibaba Cloud’s CDN service to improve its performance and user experience in China, you would need to apply an ICP license for your domain name. This is because Alibaba Cloud’s CDN nodes are located in mainland China, and any website that uses them must comply with the Chinese regulations.

Launch your website in China: If you want to host your website on an Alibaba Cloud ECS instance or OSS bucket that is located in mainland China, you would need to apply an ICP license for your domain name. This is because any website that is hosted on a mainland China server must have an ICP license to be accessible and legal in China.

Launch your online shop in China: If you want to run an e-commerce website that sells goods or services to customers in China, you would need to apply an ICP license for your domain name. This is because any website that engages in commercial activities in China must have an ICP license to operate legally and securely in China.

References :  What is an ICP License? - Alibaba Cloud Academy , ICP License Application - Alibaba Cloud Documentation Center

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 features 1 2 :

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.  References:   1 : Auto Scaling: Automatically Adjusts Computing Resources - Alibaba Cloud  2 : Auto Scaling:What is Auto Scaling? - Alibaba Cloud

 Elastic Compute Service (ECS) is an IaaS offering on Alibaba Cloud that provides high-performance, stable, reliable, and scalable compute capacity in the cloud. ECS eliminates your need to invest in hardware up front. You can create as many or as few instances as you need in response to changes in requirements or popularity of your workloads. With an ever-growing selection of instance types, ECS provides broader and deeper choices to match a wide spectrum of computing needs.  References :  What is ECS? - Alibaba Cloud

 You can create a custom image for ECS using data disk snapshots or system disk snapshots. A snapshot is a backup of the data on a disk at a specific point in time. You can use snapshots to create custom images, which are copies of the operating system and applications on a disk.  You can use custom images to create ECS instances that have the same operating system, applications, and data as the original disk 1 2 .

You cannot create a custom image for ECS using CPU snapshots or memory snapshots. These are not valid terms in Alibaba Cloud.  CPU and memory are not persistent storage devices, and they do not store the operating system and applications that are required for creating a custom image 3 4 .  References:   1 : Create a custom image from a snapshot - Alibaba Cloud 1   2 : What is a custom image?  - Alibaba Cloud 2   3 : What is a CPU?  - Alibaba Cloud 3   4 : What is memory?  - Alibaba Cloud 4

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.

References :

[Alibaba Cloud Elastic Compute Service]

ACA Cloud Computing Certification Exam Preparation Course

Alibaba Cloud ACA-Cloud1 ACA Cloud Computing Certification Exam

 B, C, and E are the correct answers according to the ACA Cloud Computing by Alibaba Cloud Academy Reference Materials and documents.  Comprehensive and Detailed Explanation : = B, C, and E are the correct answers because they are suitable services for developing a highly available web application using stateless web servers.

B is correct because Server Load Balancer (SLB) is a service that distributes network traffic across groups of backend servers to improve the service capability and application availability. SLB can handle sudden spikes in traffic, minimize response time, and maintain 99.99% availability of the web application.  SLB also supports health checks, session persistence, and cross-zone load balancing 1

C is correct because Elastic Compute Service (ECS) is a service that provides scalable and high-performance virtual machines for various computing needs. ECS can run stateless web servers that can be easily scaled up or down based on the demand. ECS can also use Auto Scaling to automate the scaling process and Elastic Self-Health to automatically recover from failures.  ECS can also leverage the Alibaba Cloud network infrastructure, such as VPC, Express Connect, and Global Accelerator, to optimize the network connectivity and performance of the web servers 2

E is correct because Object Storage Service (OSS) is a service that provides massive, secure, and cost-effective storage for static files, such as images, videos, and documents. OSS can store the static content of the web application and reduce the load and cost of the ECS instances.  OSS can also integrate with CDN to accelerate the delivery of the static content and improve the user experience and response time of the web application 3

A and D are incorrect answers because they are not suitable services for developing a highly available web application using stateless web servers.

A is incorrect because Relational Database Service (RDS) is a service that provides managed database systems, such as MySQL, SQL Server, PostgreSQL, and PPAS. RDS is not a stateless web server, but a stateful data storage and processing service.  RDS can be used to store the dynamic data of the web application, but it is not suitable for hosting the web application itself 4

D is incorrect because MaxCompute is a service that provides a fast and fully managed big data platform for large-scale data warehousing. MaxCompute is not a stateless web server, but a data analysis and processing service. MaxCompute can be used to perform complex data analytics and machine learning tasks, but it is not suitable for hosting the web application itself.

References :  1 :  SLB Overview   2 :  ECS Overview   3 :  OSS Overview   4 :  RDS Overview  : [MaxCompute Overview]

Alibaba Cloud provides security services for the underlying hardware of cloud computing, such as physical security, network security, host security, and storage security. Alibaba Cloud also provides security isolation between cloud computing tenants, such as virtualization isolation, network isolation, and data isolation. These security services are part of Alibaba Cloud’s shared responsibility model, where Alibaba Cloud is responsible for the security of the cloud infrastructure, while customers are responsible for the security of their applications and data on the cloud.  References :  Alibaba Cloud Security Services ,  Alibaba Cloud Security & Compliance Center , Shared Responsibility Model

SQL injection is a common application layer attack that targets the database of a web application. SQL injection exploits a security vulnerability in the application’s software, such as incorrect filtering of user input, that allows an attacker to send malicious SQL statements to the database.  These statements can then be executed to steal, modify, or delete data, or even execute commands on the server 1 .  SQL injection can also bypass authentication and authorization mechanisms, and sometimes even impersonate or damage the underlying system 2 .  SQL injection is one of the most common and dangerous web attacks, and it can cause serious damage to the confidentiality, integrity, and availability of web applications 3 .  References :  1 :  SQL Injection - OWASP 2 :  SQL Injection - Web Application Firewall - Alibaba Cloud Documentation Center 3 :  Web Application Firewall:What is WAF? - Alibaba Cloud .

ECS instance filesystem directory operation is not a supported method to create a bucket in OSS. A bucket is a container for objects in OSS, and it is not related to the filesystem of an ECS instance.  To create a bucket in OSS, you can use one of the following methods 1 :

through OSS API/SDK: You can use the OSS API or SDK to call the PutBucket operation to create a bucket.  The OSS API and SDK support various programming languages, such as Java, Python, PHP, C#, and Node.js 2 .

through oss cmd tool: You can use the oss cmd tool, which is a command-line tool based on the OSS SDK for Python, to create a bucket by using the ossutil mb command 3 .

through cloud console: You can use the Alibaba Cloud console to create a bucket by following the steps in the documentation 4 .  References :  1 :  Create buckets - Object Storage Service - Alibaba Cloud Documentation Center 2 :  PutBucket - API Reference| Alibaba Cloud Documentation Center 3 :  Create a bucket - OSSUTIL User Guide| Alibaba Cloud Documentation Center 4 :  Create a bucket - Object Storage Service - Alibaba Cloud Documentation Center .

A snapshot is a copy of data on a disk at a certain point in time. It is used to back up and restore data, or create custom images.  Snapshots can capture the data of system disks, data disks, and shared block storage devices 1 .

References :  1 : Alibaba Cloud Academy, “Snapshot”, https://edu.alibabacloud.com/elearning/lesson/ACA-Cloud-Computing-Certification/lesson-3-snapshot

 A company wants to use Alibaba Cloud service to replace their self-built database, which of the following services should it choose?  The best answer is ApsaraDB for RDS, which is a stable, reliable, cost-effective, and scalable online database service that supports most mainstream database engines, including MySQL, SQL Server, PostgreSQL, PPAS (highly compatible with Oracle), and MariaDB 1 .  ApsaraDB for RDS is based on the Apsara Distributed File System and high-performance SSDs of Alibaba Cloud, and provides various features such as backup and recovery, performance monitoring, security, and disaster recovery 2 . By using ApsaraDB for RDS, the company can reduce the complexity and cost of database management, and focus on their core business.

The other options are not suitable for replacing a self-built database. Server Load Balancer (SLB) 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 3 . Alibaba Cloud CDN (Content Delivery Network) is a service that delivers content from origin servers to edge nodes, and accelerates the response to user requests.  It can be used to improve the user experience and reduce the bandwidth consumption of origin servers 4 .  Deploying more ECS instances is a way to increase the computing resources and scalability of applications, but it does not provide a database service 5 .  References:   1 : What is ApsaraDB RDS?  - ApsaraDB RDS - Alibaba Cloud 1   2 : ApsaraDB RDS:What is ApsaraDB RDS?  - Alibaba Cloud 2   3 : Server Load Balancer - Alibaba Cloud Documentation Center 3   4 : Alibaba Cloud CDN - Alibaba Cloud 4   5 : Elastic Compute Service (ECS) - Alibaba Cloud 5

Alibaba Cloud Architecture Design Training is a service that provides professional guidance and best practices for designing cloud architectures that meet the business requirements and goals of the company. Alibaba Cloud Architecture Design Training can help the company to understand the cloud migration process, select the appropriate Alibaba Cloud products and services, design a secure, reliable, scalable, and cost-effective cloud architecture, and implement the migration plan with minimal risks and disruptions. Alibaba Cloud Architecture Design Training can also help the company to optimize the performance and efficiency of the cloud system after the migration.

References :

Alibaba Cloud Architecture Design Training

Cloud Migration - Alibaba Cloud Solutions

ACA-Cloud1 Alibaba Exam Questions and Answers - CertLibrary

Auto Scaling is a service that automatically adjusts computing resources based on your volume of user requests.  When the demand for computing resources increases, Auto Scaling automatically adds ECS instances to serve additional user requests, or alternatively removes instances in the case of decreased user requests 1 .  Auto Scaling can help you manage traffic peaks efficiently and maintain a consistent user experience by scaling up or down your ECS instances according to your predefined policies and business needs 2 .  References :  1 :  Auto Scaling: Automatically Adjusts Computing Resources - Alibaba Cloud 2 :  Overview - Auto Scaling - Alibaba Cloud Documentation Center .

Alibaba Cloud relational database service (RDS) is a stable, reliable and elastic online database service that supports various database engines, such as MySQL, SQL Server, PostgreSQL, MariaDB, and PPAS (PostgreSQL with Oracle compatibility) 1 . RDS provides high availability, backup and recovery, security, and monitoring features for your databases.  RDS does not support Oracle database, which is a proprietary database system developed by Oracle Corporation 2 .  If you need to use Oracle database on Alibaba Cloud, you can deploy it on an ECS instance or use the Oracle Database Backup Service 3 .

References :  1 : Alibaba Cloud Academy, “RDS Concepts”, https://edu.alibabacloud.com/elearning/lesson/ACA-Cloud-Computing-Certification/lesson-5-rds-concepts  2 : Oracle, “Oracle Database”, https://www.oracle.com/database/  3 : Alibaba Cloud, “Oracle Database Backup Service”, https://www.alibabacloud.com/product/oracle-database-backup-service