Free ACA-Cloud1 Exam Study Guide for the NEW [Apr-2025] Dumps Test Engine
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Alibaba Cloud ACA-Cloud1 (ACA Cloud Computing Associate) exam is designed for individuals who want to demonstrate their knowledge and skills in cloud computing. As the demand for cloud computing services continues to grow, more and more companies are looking for professionals who can help them effectively manage their cloud infrastructure. The ACA-Cloud1 exam is an industry-recognized certification that validates the expertise of individuals in cloud computing technologies, including basic concepts, architecture, deployment models, and security.
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NEW QUESTION # 16
A video streaming company uses SLB to distribute user requests to 30 ECS instances (the 30 ECS instances have the same configuration). Yet, the company finds that the service traffic soars dramatically every night from 20:00 to 02:00. According to their calculation, the evening traffic is 100% higher than the traffic in other periods of time. To properly respond to user requests, which of the following methods is most preferred from the perspective of cost and implementation simplicity?
- A. Configure Auto Scaling appropriately to automatically upgrade/downgrade the ECS instances.
- B. Manually create 30 ECS instances using the custom image, and then add them to SLB every night before 20:00 and remove them after 02:00.
- C. Create 30 ECS instances based on the custom image and add them to SLB. Then, configure weights for these ECS instances to respond to user requests every night from 20:00 to 02:00, and reset those weights to zero for other periods of time.
- D. Configure Auto Scaling appropriately to automatically add or reduce ECS instances.
Answer: D
Explanation:
Reference:
https://www.alibabacloud.com/product/auto-scaling
NEW QUESTION # 17
Which of the following statements is true for RDS?
- A. Multiple databases can be created in one RDS instance.
- B. None of the above is true.
- C. Resources are not shared among the databases in the same RDS instance.
- D. Databases with the same name are allowed in the same instance.
Answer: A
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/26092.htm
NEW QUESTION # 18
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
Explanation:
Reference:
https://apsarastackdocument.oss-cn-hangzhou.aliyuncs.com/01_ApsaraStackEnterprise/V3.5.2- intl-en/Alibaba%20Cloud%20Apsara%20Stack%20Enterprise%201808%20Security%20Whitepaper%20-% 2020180831.pdf
NEW QUESTION # 19
You can create a custom image for ECS using which of the followings? (Choose two.)
- A. CPU snapshot
- B. Data disk snapshot
- C. System disk snapshot
- D. Memory snapshot
Answer: B,C
Explanation:
Explanation
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 disk12.
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 image34. References: 1: Create a custom image from a snapshot - Alibaba Cloud1 2: What is a custom image? - Alibaba Cloud2 3: What is a CPU? - Alibaba Cloud3 4: What is memory? - Alibaba Cloud4
NEW QUESTION # 20
A video streaming company uses SLB to distribute user requests to 30 ECS instances (the 30 ECS instances have the same configuration). Yet, the company finds that the service traffic soars dramatically every night from 20:00 to 02:00. According to their calculation, the evening traffic is 100% higher than the traffic in other periods of time. To properly respond to user requests, which of the following methods is most preferred from the perspective of cost and implementation simplicity?
- A. Configure Auto Scaling appropriately to automatically upgrade/downgrade the ECS instances.
- B. Manually create 30 ECS instances using the custom image, and then add them to SLB every night before 20:00 and remove them after 02:00.
- C. Create 30 ECS instances based on the custom image and add them to SLB. Then, configure weights for these ECS instances to respond to user requests every night from 20:00 to 02:00, and reset those weights to zero for other periods of time.
- D. Configure Auto Scaling appropriately to automatically add or reduce ECS instances.
Answer: D
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, using Auto Scaling is the most preferred method from the perspective of cost and implementation simplicity, as it can dynamically adjust the number of ECS instances according to the traffic fluctuations, without requiring manual operations or wasting resources. The other methods are either too complex, inefficient, or costly to implement. 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 # 21
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 leverages RAID0+1 configuration of its underlying physical hard disks. There is no impact even if 2 hard disks were to fail simultaneously.
- C. OSS supports 3 internal data copies, no human intervention is required to recover the data when anything goes wrong.
- D. OSS supports 3 internal data copies, so the data can be manually recovered should there be any problem.
Answer: A
NEW QUESTION # 22
Anti-DDoS is one of the major features in Alibaba Cloud Security Service. Many websites have experienced different types of DDoS attacks, an accurate understanding of DDoS is crucial to protecting websites. Which of the following descriptions about DDoS attack is the most accurate one?
- A. The main purpose of DDoS attack is to make the target server unable to provide service normally, which is one of the network attacks that are most difficult to defend.
- B. The purpose of DDoS attack is to steal confidential information.
- C. DDoS attack will try to crack the password through a large number of attempts.
- D. The main target for DDoS attack is the database.
Answer: A
NEW QUESTION # 23
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?
- A. Elastic Self-Diagnostic
- B. Elastic Scale-Out
- C. Elastic Self-Health
- D. Elastic Scale-In
Answer: A
Explanation:
Explanation
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. References: 1: Auto Scaling:
Automatically Adjusts Computing Resources - Alibaba Cloud 2: Auto Scaling:What is Auto Scaling? - Alibaba Cloud
NEW QUESTION # 24
When we talk about the 'Elastic' feature for ECS product, we are not talking about.
- A. Elastic Computing
- B. Elastic Storage
- C. Elastic Administration
- D. Elastic Network
Answer: C
Explanation:
Explanation
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
NEW QUESTION # 25
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. FALSE
- B. TRUE
Answer: B
Explanation:
Explanation
Server Load Balancer (SLB) is a service that distributes traffic among multiple ECS instances to improve the service capabilities of applications. SLB monitors the health of ECS instances in real time and automatically isolates unhealthy instances from the server pool according to the configured health check policy. This ensures that the traffic is only forwarded to healthy instances, thereby improving the availability and fault tolerance of applications. References: ACA Cloud Computing Certification - Alibaba Cloud Academy, E-Learning Courses
- Alibaba Cloud Academy, Server Load Balancer - Alibaba Cloud Documentation Center
NEW QUESTION # 26
You can create a custom image for ECS using which of the followings? (Choose two.)
- A. CPU snapshot
- B. Data disk snapshot
- C. System disk snapshot
- D. Memory snapshot
Answer: B,C
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/25460.htm
NEW QUESTION # 27
A/An _________________ is a copy of data on a disk at a certain point in time.
- A. snapshot
- B. template
- C. EIP
- D. image
Answer: A
NEW QUESTION # 28
Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. It supports adding an existing ECS instance into the scaling group but imposes certain requirements on instance region. In this case, which of the following statements is true?
- A. The instance and the scaling group must be in the same region but not necessarily the same zone.
- B. Each scaling group can span up to two regions. After adding the ECS instance, the number of regions of all the ECS instances in the scaling group must be no greater than two.
- C. The instance and the scaling group can be in different regions and zones.
- D. The instance and the scaling group must be in the same region and zone.
Answer: D
NEW QUESTION # 29
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. Auto Scaling
- B. Server Load Balancer
- C. RDS
- D. OSS
Answer: A
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 # 30
Alibaba Cloud CDN can directly accelerate the access to the files stored in OSS and reduce OSS traffic costs.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION # 31
Alibaba Cloud Monitor service stems from years of experience of server monitoring technology in Alibaba group, leveraging the powerful data analysis capability of Alibaba cloud computing platform to provide monitoring service for various clients' applications and servers. A user receives an alert saying that the IOPS utilization rate for an ECS instance exceeds 80%. Yet, he/she is not sure how to handle the situation, the user may obtain help from Alibaba Cloud through the below methods ____________________? (Choose three.)
- A. Open a ticket to Alibaba Cloud help desk.
- B. Look for answers in Alibaba Cloud forum.
- C. You cannot obtain any help from Alibaba Cloud.
- D. Check ECS or CloudMonitor product documents.
Answer: A,B,D
NEW QUESTION # 32
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. large-traffic apps
- B. Official corporate websites
- C. Databases
- D. no limited online storage
- E. simple web applications
Answer: A,B,C,E
NEW QUESTION # 33
RDS for MySQL is a PaaS, which means after creating the RDS instance, the user does not need to take care of the underlying OS, runtime environment of software packages. These would be taken care of by Alibaba Cloud.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 34
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