ACA-Cloud1 Free Exam Questions and Answers PDF Updated on Apr-2025
Latest ACA-Cloud1 Exam Dumps Recently Updated 74 Questions
NEW QUESTION # 28
Cloud disks are reliable because they use_________to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.
- A. a distributed file management system with 3 redundant copies
- B. a double copy distributed system
- C. a file system
- D. a Linux file system
Answer: A
Explanation:
Explanation
An ECS disk can be used jointly or separately to meet the requirements of different application scenarios. ECS disks are categorized into ephemeral SSD disks and cloud disks. Compared with ephemeral SSD disks, cloud disks are more reliable as they use a triplicate distributed system to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.
NEW QUESTION # 29
When using Alibaba Cloud OSS, you can set access control in 3 different levels, which are (Choose three.)
- A. Object level
- B. Directory level
- C. Bucket level
- D. RAM account level
Answer: A,C,D
Explanation:
Explanation
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. References: Object Storage Service (OSS) - Alibaba Cloud Academy, Access Control - Alibaba Cloud Documentation Center
NEW QUESTION # 30
Alibaba Cloud relational database service (RDS) is a stable, reliable and elastic online database service. RDS supports below database types ? (Choose three.)
- A. PostgreSQL
- B. MySQL
- C. SQL Server
- D. Oracle database
Answer: A,B,C
NEW QUESTION # 31
Some applications may encounter large traffic fluctuations within a short period. When ECS is used with
__________ , the number of ECS instances is automatically adjusted based on traffic.
- A. RDS
- B. Auto Scaling
- C. OSS
- D. Server Load Balancer
Answer: B
Explanation:
Explanation
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. References: 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.
NEW QUESTION # 32
Alibaba Cloud Object Storage Service (OSS) is a massive, highly available, secured and cost effective storage service. OSS is superior than self-built storage in all these aspects. Which of the following advantage relates to the high availability of OSS?
- A. Data Reliability is not less than 99.99999999%. Data is backed up automatically with multiple redundant copies.
- B. Availability actually relies on the underlying hardware, which can break down easily. Once the hard disk malfunctions, it can also lead to permanent data loss.
- C. Data has to be backed up by customer manually, which is time-consuming and labor-intensive.
- D. The following features are available: Multiple Authentication and Authorization mechanism, Whitelist, Anti- leech URL, and Master-Sub Account
Answer: A
Explanation:
Explanation/Reference: https://www.alibabacloud.com/blog/alibaba-cloud-object-storage-vs--ibm-cloud-and-oracle-cloud- equivalent_293464
NEW QUESTION # 33
Server Load Balancer can help protect fromattack.
- A. Virus
- B. Ransomware
- C. DDoS
- D. SQL injection
Answer: C
Explanation:
Explanation
Server Load Balancer (SLB) can help protect from distributed denial-of-service (DDoS) attacks by distributing network traffic across groups of backend servers to improve the service capability and application availability. SLB also supports built-in Anti-DDoS services to ensure business security. Anti-DDoS services can mitigate DDoS attacks at the Tbit/s level and provide multiple defense methods, such as blackhole filtering, traffic scrubbing, and access control1. In addition, you can integrate Application Load Balancer (ALB) with Web Application Firewall (WAF) in the console to ensure security at the application layer and prevent attacks such as SQL injection2. References: 1: Server Load Balancer(SLB) - Alibaba Cloud2: Associate an EIP protected by Anti-DDoS Pro/Premium with an ALB instance - Server Load Balancer - Alibaba Cloud Documentation Center.
NEW QUESTION # 34
ECS is a highly flexible service. It can be used independently as a simple web server, or used with other Alibaba Cloud products, such as OSS and CDN, to provide advanced solutions. ECS can be used in applications such as:. (Choose four.)
- A. Databases
- B. large-traffic apps
- C. Official corporate websites
- D. no limited online storage
- E. simple web applications
Answer: A,B,C,E
NEW QUESTION # 35
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.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 36
RDS provides whitelist access policies. You can set permitted IP addresses and IP network segments to effectively prevent hackers from attacking the server by port scanning.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 37
Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. It supports adding existing ECS instances into the scaling group, whose status however must be________.
- A. Preparing
- B. Stopped
- C. Running
- D. Created
Answer: C
NEW QUESTION # 38
Server Load Balancer can help protect from attack.
- A. Virus
- B. Ransomware
- C. DDoS
- D. SQL injection
Answer: C
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/27539.htm
NEW QUESTION # 39
A customer uses Alibaba Cloud Auto Scaling service and creates a scaling group. He/she 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 "Remove 5 ECS instances", and creates a scheduled task based on this rule.
And then, the customer checks the scaling group and see it already contains 8 valid ECS instances, he/she then enables this scaling group immediately.
How many ECS instances are left in the scaling group when the scheduled task is activated once?
- A. Six
- B. Five
- C. One
- D. Zero
Answer: D
NEW QUESTION # 40
RDS provides whitelist access policies. You can set permitted IP addresses and IP network segments to effectively prevent hackers from attacking the server by port scanning.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
Explanation
A is the correct answer because RDS provides whitelist access policies that allow you to set permitted IP addresses and IP network segments to effectively prevent hackers from attacking the server by port scanning.
A whitelist is a security feature that specifies the IP addresses or CIDR blocks that are allowed to access your RDS instance. By default, the whitelist is empty, which means that no IP address can access your RDS instance. You can add IP addresses or CIDR blocks to the whitelist according to your business needs. You can also create multiple whitelist groups and assign different IP addresses or CIDR blocks to each group. This can help you manage the access permissions of different users or applications12 References: 1: Configure a whitelist 2: ApsaraDB RDS:Configure an IP address whitelist
NEW QUESTION # 41
SQL injection is a common application layer attack, usually through building special input parameters and pass it to web applications to steal or sabotage the application data. Which of the following is the target for SQL injection?
- A. Pictures on server
- B. Database
- C. Web application
- D. Confidential files on the server
Answer: B
Explanation:
Explanation
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 server1. SQL injection can also bypass authentication and authorization mechanisms, and sometimes even impersonate or damage the underlying system2. 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 applications3. References: 1: SQL Injection - OWASP2: SQL Injection - Web Application Firewall - Alibaba Cloud Documentation Center3: Web Application Firewall:What is WAF? - Alibaba Cloud.
NEW QUESTION # 42
A/An _________________ is a copy of data on a disk at a certain point in time.
- A. EIP
- B. image
- C. snapshot
- D. template
Answer: C
NEW QUESTION # 43
Server Load Balancer can manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
Explanation
A is the correct answer because Server Load Balancer (SLB) can manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application. SLB distributes network traffic across groups of backend servers to improve the service capability and application availability. It includes Layer 4 Network Load Balancer (NLB), Layer 7 Application Load Balancer (ALB), and Classic Load Balancer (CLB). SLB provides high-performance load balancing services with super four-seven processing capabilities. SLB also provides disaster recovery at four levels for high availability and supports built-in Anti-DDoS services to ensure business security. SLB supports multiple protocols, such as TCP, UDP, HTTP, HTTPS, QUIC, and gRPC. SLB also supports cloud-native networks and is integrated with other cloud-native services, such as Container Service for Kubernetes (ACK), Serverless App Engine (SAE), and Kubernetes123 References: 1: SLB Overview 2: SLB Types & Pricing 3: What is ALB?
Manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application with Server Load Balancer.
NEW QUESTION # 44
Alibaba Cloud CDN can directly accelerate the access to the files stored in OSS and reduce OSS traffic costs.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
Explanation
Alibaba Cloud CDN can directly accelerate the access to the files stored in OSS and reduce OSS traffic costs.
Alibaba Cloud CDN is a global network of points of presence (POPs) that are distributed across the globe.
Alibaba Cloud CDN serves to reduce back-to-origin traffic. This in turn prevents network congestion and reduces latency. If you use Alibaba Cloud CDN to accelerate access to OSS, you can benefit from the following advantages1:
Improved user experience: Alibaba Cloud CDN caches the files stored in OSS to the POPs that are nearest to the users. This reduces the distance that the files need to travel and improves the access speed and user experience.
Reduced OSS traffic costs: Alibaba Cloud CDN reduces the number of requests that are sent to OSS.
This reduces the OSS traffic costs and the load on the OSS servers.
Enhanced security: Alibaba Cloud CDN supports HTTPS secure acceleration and anti-leech protection.
This ensures the security and integrity of the files stored in OSS. References: Use Alibaba Cloud CDN to accelerate access to OSS
NEW QUESTION # 45
Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. Which of the following application scenarios are suitable for Auto Scaling?
(Choose three.)
- A. You need to flexibly adjust elastic computing resources based on your business needs, and ECS instances will be reduced automatically to save costs when business needs drop.
- B. When an ECS instance reacts abnormally in a scaling group, Auto Scaling will create a new ECS instance to take over the computing tasks conducted by the faulty instance.
- C. You want to flexibly adjust elastic computing resources based on your business needs, and ECS instances will be automatically upgraded (with more Memory, more powerful CPU) when needed.
- D. You need to flexibly adjust elastic computing resources based on your business needs, and ECS instances will be added seamlessly to address traffic peaks and surges.
Answer: A,B,D
Explanation:
Explanation
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 the following protocols for the listener configuration:
HTTP: Hypertext Transfer Protocol, a stateless application-layer protocol that is used to transfer web pages and other resources over the internet.
HTTPS: Hypertext Transfer Protocol Secure, an extension of HTTP that uses SSL/TLS encryption to provide secure communication between the client and the server.
TCP: Transmission Control Protocol, a reliable, connection-oriented transport-layer protocol that provides reliable data delivery and error recovery.
UDP: User Datagram Protocol, a connectionless transport-layer protocol that provides fast and efficient data transmission without guaranteeing reliability or order.
SLB does not support the following protocols:
MPLS: Multiprotocol Label Switching, a data-carrying technique that uses labels to forward packets across a network.
MQTT: Message Queuing Telemetry Transport, a lightweight publish/subscribe messaging protocol that is designed for constrained devices and low-bandwidth networks.
References:
Alibaba Cloud Server Load Balancer
ACA Cloud Computing Certification Exam Preparation Course
Alibaba Cloud Computing Exam Question 2022
NEW QUESTION # 46
Company A builds a sales management platform based on Alibaba Cloud services, using 3 ECS instances. One of the ECS instance has MySQL installed as the database server of the platform, the other two are used as WEB servers. After some time, due to the rapid increase of employees and sales analysis requests, the performance of the platform is challenged in terms of response time. Through CloudMonitor, it is found that the average CPU usage reaches 70% for the two WEB server ECS instances and the database load reaches
75% for the database server ECS instance. In this situation, company A may choose which Alibaba Cloud services to improve the performance. (Choose two.)
- A. Use content delivery network, CDN, to accelerate the caching of the platform's css, JavaScript files etc.
- B. Import data into OSS to share the storage load of the platform.
- C. By adding a SLB instance and increase the number of ECS instances to reduce the work load on current ECS instances.
- D. Use RDS to replace existing self-built database, in order to obtain better database performance; also creating RDS read-only instances to handle read-only requests, hence reduce the work load on master RDS instance.
Answer: A,D
Explanation:
Explanation
A and C are the correct answers because they can improve the performance of the platform by reducing the load on the ECS instances and the database server.
A is correct because using CDN can accelerate the delivery of static content such as CSS and JavaScript files, which can reduce the bandwidth consumption and latency of the ECS instances. CDN can also cache the content in edge nodes closer to the end users, which can improve the user experience and response time of the platform1 C is correct because using RDS can replace the existing self-built database, which can provide better database performance, reliability, security, and scalability. RDS can also handle the backup, recovery, monitoring, and maintenance of the database, which can reduce the management overhead and cost of the platform. Moreover, creating RDS read-only instances can handle read-only requests, which can reduce the workload on the master RDS instance and improve the database availability and performance23 References: 1: CDN Overview 2: RDS Overview 3: RDS Read-only Instances
NEW QUESTION # 47
Your website has oscillating traffic peaks that are difficult to predict in advance. In this scenario, it is recommended to use SLB and together with ECS.
- A. RDS
- B. Auto Scaling
- C. MaxCompute
- D. VPC
Answer: B
NEW QUESTION # 48
SQL injection is a common application layer attack, usually through building special input parameters and pass it to web applications to steal or sabotage the application data. Which of the following is the target for SQL injection?
- A. Pictures on server
- B. Database
- C. Web application
- D. Confidential files on the server
Answer: B
Explanation:
Explanation
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 server1. SQL injection can also bypass authentication and authorization mechanisms, and sometimes even impersonate or damage the underlying system2. 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 applications3. References: 1: SQL Injection - OWASP2: SQL Injection - Web Application Firewall - Alibaba Cloud Documentation Center3: Web Application Firewall:What is WAF? - Alibaba Cloud.
NEW QUESTION # 49
You are developing a highly available web application using stateless web servers. Which services are suitable for the application? (Choose three.)
- A. RDS
- B. OSS
- C. MaxCompute
- D. ECS
- E. SLB
Answer: B,D,E
Explanation:
Explanation
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 balancing1 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 servers2 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 application3 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 itself4 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]
NEW QUESTION # 50
Server Load Balancer supports health checks for ECS instances and allows user to specify the frequency. If an ECS instance does not qualify the health check, traffic will not be forwarded to that instance, thereby ensuring application availability.
- A. TRUE
- B. FALSE
Answer: B
Explanation:
Explanation
NEW QUESTION # 51
Which of the following ECS instance configurations can't be changed if we don't change instance type?
- A. Number of data disk
- B. Mem size
- C. System disk size
- D. Data disk size
Answer: B
Explanation:
Explanation
= A is the correct answer because the memory size of an ECS instance is determined by the instance type, and it cannot be changed independently. If you want to change the memory size of an ECS instance, you must change the instance type to another one that has a different memory size12 B, C, and D are incorrect answers because the system disk size, data disk size, and number of data disks of an ECS instance can be changed without changing the instance type. You can use the ECS console or API to resize the system disk or data disks of an ECS instance, or add or remove data disks from an ECS instance3456 References: 1: Overview of instance families 2: Change the instance type 3: Resize disks 4: Resize a disk 5: Attach or detach data disks 6: Attach or detach a data disk
NEW QUESTION # 52
Alibaba Cloud Object Storage Service (OSS) is a massive, highly available, secured and cost effective storage service. One of the special characteristics of OSS is its superior data reliability, because of its underlying backup technology and policies. Which of the following statement about OSS backup is correct?
- A. Customer has to safeguard their own data. OSS provides various backup interfaces to facilitate offsite backups.
- B. OSS supports 3 internal data copies, no human intervention is required to recover the data when anything goes wrong.
- C. OSS leverages RAID0+1 configuration of its underlying physical hard disks. There is no impact even if 2 hard disks were to fail simultaneously.
- D. OSS supports 3 internal data copies, so the data can be manually recovered should there be any problem.
Answer: A
NEW QUESTION # 53
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