[2025] Pass Alibaba Cloud ACA-Cloud1 Test Practice Test Questions Exam Dumps
Verified ACA-Cloud1 dumps Q&As - ACA-Cloud1 dumps with Correct Answers
NEW QUESTION # 31
You canan ECS instance's configuration. (Choose two.)
- A. downgraded
- B. upgraded
- C. uploaded
- D. downloaded
Answer: A,B
Explanation:
Explanation
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 the Stopped state and uses a pay-as-you-go billing method.
The instance is in the Running state and uses a subscription billing 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 the Stopped state and uses a pay-as-you-go billing method, and the instance is not associated with an EIP.
The instance is in the Running state and uses a subscription billing 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 the Stopped state and uses a pay-as-you-go billing method, and the disk is not encrypted.
The instance is in the Running state and uses a subscription billing method, and the disk is not encrypted. References: 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.
NEW QUESTION # 32
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. The instance and the scaling group can be in different regions and zones.
- C. The instance and the scaling group must be in the same region and zone.
- D. 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.
Answer: C
NEW QUESTION # 33
__________feature in Server Load Balancer means that it can forward the access requests from a single user to the same ECS instance within a certain period to ensure session continuity.
- A. least connections scheduling
- B. health check
- C. Weighted Round Robin
- D. session persistence
Answer: D
Explanation:
Explanation
Session persistence feature in Server Load Balancer means that it can forward the access requests from a single user to the same ECS instance within a certain period to ensure session continuity. This feature is useful for applications that require users to maintain a stateful connection with the backend servers, such as online shopping or banking. Session persistence can be enabled by configuring a cookie timeout period or a source IP hash method in the Server Load Balancer console. References: ACA Cloud Computing Certification - Alibaba Cloud Academy, Server Load Balancer - Alibaba Cloud Academy, Session Persistence - Alibaba Cloud Documentation Center
NEW QUESTION # 34
Cloud disks are reliable because they use_________to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.
- A. a double copy distributed system
- B. a distributed file management system with 3 redundant copies
- C. a Linux file system
- D. a file system
Answer: B
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 # 35
You can an ECS instance's configuration. (Choose two.)
- A. downgraded
- B. upgraded
- C. uploaded
- D. downloaded
Answer: A,B
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/25437.htm
NEW QUESTION # 36
As a cloud computing service provider, Alibaba Cloud provides security services including. (Choose two.)
- A. Application maintenance in ECS instances.
- B. Security operation for underlying hardware of cloud computing.
- C. Security isolation between cloud computing tenants.
- D. IP white list setting for RDS.
Answer: B,C
Explanation:
Explanation
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
NEW QUESTION # 37
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. 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.
- B. Configure Auto Scaling appropriately to automatically upgrade/downgrade the ECS instances.
- C. Configure Auto Scaling appropriately to automatically add or reduce ECS instances.
- D. 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.
Answer: C
NEW QUESTION # 38
Which of the following scenarios is applicable to use RDS read-only instances?
- A. Improves RDS storage capabilities.
- B. Implements data backtracking for the last two days.
- C. Reduces the write pressure on the RDS primary instance.
- D. Reduces the read pressure on the RDS primary instance.
Answer: D
Explanation:
Explanation
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.
References:
Overview of read-only ApsaraDB RDS for MySQL instances
ACA Cloud Computing Certification Exam Preparation Course
Alibaba Cloud Computing Exam Question 2022
NEW QUESTION # 39
You are developing a highly available web application using stateless web servers. Which services are suitable for the application? (Choose three.)
- A. ECS
- B. RDS
- C. OSS
- D. SLB
- E. MaxCompute
Answer: A,C,D
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 # 40
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. (Choose three.)
- A. Public-read-write
- B. Public-read
- C. Private
- D. Private-read
Answer: A,B,C
NEW QUESTION # 41
Alibaba Cloud relational database service (RDS) is a stable, reliable and elastic online database service. RDS supports below database types _______________? (Choose three.)
- A. Oracle database
- B. PostgreSQL
- C. MySQL
- D. SQL Server
Answer: B,C,D
NEW QUESTION # 42
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?
- A. 100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.
- B. Based on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.
- C. We do not know the weight settings of the remaining 4 ECS instances, so we cannot tell what would happen.
- D. Based on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1.
Answer: C
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 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.
References:
Alibaba Cloud Server Load Balancer
[ACA Cloud Computing Certification Exam Preparation Course]
Alibaba Cloud Computing Exam Question 2022
NEW QUESTION # 43
You can retrieve data directly from an ECS Image and use it right away.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
Explanation
An ECS image is a copy of data from one or more disks that are attached to an ECS instance. You cannot retrieve data directly from an ECS image and use it right away. You need to create an ECS instance from the image first, and then access the data on the disks of the instance. References: Elastic Compute Service:Image overview
NEW QUESTION # 44
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. The following features are available: Multiple Authentication and Authorization mechanism, Whitelist, Anti- leech URL, and Master-Sub Account
- B. Data Reliability is not less than 99.99999999%. Data is backed up automatically with multiple redundant copies.
- C. Data has to be backed up by customer manually, which is time-consuming and labor-intensive.
- D. 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.
Answer: B
Explanation:
Reference:
https://www.alibabacloud.com/blog/alibaba-cloud-object-storage-vs--ibm-cloud-and-oracle-cloud- equivalent_293464
NEW QUESTION # 45
A company wants to use Alibaba Cloud service to replace their self-built database, which of the following services should it choose?
- A. AsparaDB for RDS
- B. Alibaba Cloud CDN (Content Delivery Network)
- C. Server Load Balancer (SLB)
- D. Deploy more ECS instances
Answer: D
NEW QUESTION # 46
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 purpose of DDoS attack is to steal confidential information.
- B. DDoS attack will try to crack the password through a large number of attempts.
- C. The main target for DDoS attack is the database.
- D. 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.
Answer: D
NEW QUESTION # 47
Multiple lower-configuration I/O-optimized ECS instances can be used withto deliver a high- availability architecture.
- A. RDS
- B. OSS
- C. Auto Scaling
- D. Server Load Balancer
Answer: D
Explanation:
Explanation
Server Load Balancer (SLB) is a service that distributes network traffic across multiple ECS instances to improve the service capabilities of applications. By using SLB, you can increase the availability and fault tolerance of your applications. You can also use SLB with Auto Scaling to dynamically adjust the number of ECS instances based on the traffic load. Multiple lower-configuration I/O-optimized ECS instances can be used with SLB to deliver a high-availability architecture that can handle traffic spikes and reduce costs.
References:
Alibaba Cloud Server Load Balancer
Alibaba Cloud Elastic Compute Service
ACA Cloud Computing Certification Exam Preparation Course
NEW QUESTION # 48
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. Check ECS or CloudMonitor product documents.
- B. Look for answers in Alibaba Cloud forum.
- C. Open a ticket to Alibaba Cloud help desk.
- D. You cannot obtain any help from Alibaba Cloud.
Answer: A,B,C
NEW QUESTION # 49
Which of the following statements about file uploading to OSS strategy is not correct?
- A. If you are using OSS to store some log files which are continuously being updated, you better choose streaming method to be able to append to one existing object instead of overwriting.
- B. If you need to upload very large file you better use multi-part uploading to get the capability of resuming from break point.
- C. If you are uploading some small files (<1m), you can choose using put method to be able finish uploading in one http request.
- D. All file uploading method provided by Alibaba Cloud OSS service will support resuming from break point.
Answer: D
Explanation:
Explanation
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.
References: 1: Alibaba Cloud Academy, "OSS Upload Methods",
https://edu.alibabacloud.com/elearning/lesson/ACA-Cloud-Computing-Certification/lesson-2-oss-upload-method Alibaba Cloud, "Resumable upload", https://www.alibabacloud.com/help/doc-detail/31991.htm
NEW QUESTION # 50
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ACA-Cloud1 certification guide Q&A from Training Expert VCETorrent: https://www.vcetorrent.com/ACA-Cloud1-valid-vce-torrent.html
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