ACA-Cloud1 PDF問題集で2025年04月22日最近更新された問題
ACA-Cloud1試験問題有効なACA-Cloud1問題集PDF
質問 # 28
Which of the following is not the database type supported by RDS?
- A. SQL Server
- B. Postgre SQL
- C. MySQL
- D. Oracle database
正解：D
解説：
Reference:
https://aws.amazon.com/rds/features/
質問 # 29
Your friend purchases some Alibaba Cloud resources and uses them to build an online training website. Before the site goes online, your friend wants to perform some performance tests but doesn't know how to do it. In this case, which of the following services can help?
- A. After-Sales Support Service
- B. None Of The Above
- C. Load and Performance Testing Service
- D. Support Ticket Service
正解：A
質問 # 30
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. 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.
- C. 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.
- D. Configure Auto Scaling appropriately to automatically add or reduce ECS instances.
正解：D
解説：
Reference:
https://www.alibabacloud.com/product/auto-scaling
質問 # 31
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.
正解：A、B、D
質問 # 32
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
正解：B
質問 # 33
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. Based on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.
- B. Based on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred 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. 100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.
正解：C
解説：
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
質問 # 34
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. All file uploading method provided by Alibaba Cloud OSS service will support 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. If you need to upload very large file you better use multi-part uploading to get the capability of resuming from break point.
正解：A
質問 # 35
Which of the following statements is wrong when comparing RDS with self-built database?
- A. Self-built database supports quick deployment and elastic scaling.
- B. RDS features a high availability of 99.95% while self-built database requires you to implement data protection, primary-standby replication, and RAID all by yourself.
- C. RDS provides automatic backup while self-built database requires you to prepare storage space for backup copies and regularly verify that these copies can be restored.
- D. RDS requires no O&M while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.
正解：A
解説：
Explanation
ApsaraDB RDS is a cloud-based relational database service that provides secure, cost-effective, and scalable database solutions for various applications. RDS has many advantages over self-built databases, such as high availability, automatic backup, and easy O&M. One of the statements that is wrong when comparing RDS with self-built database is that self-built database supports quick deployment and elastic scaling. This is not true, because self-built database requires users to purchase, install, and configure hardware and software by themselves, which can be time-consuming and complex. Moreover, self-built database cannot easily adjust the computing and storage resources according to the business needs, which can lead to over-provisioning or under-provisioning. RDS, on the other hand, supports quick deployment and elastic scaling, because users can create, modify, or delete RDS instances in minutes through the console or API. Users can also scale up or down the RDS instance specifications, storage capacity, or network bandwidth without affecting the business continuity.
References:
ApsaraDB RDS
ACA Cloud Computing Certification Exam Preparation Course
Which of the following statements is NOT correct, when comparing RDS ...
質問 # 36
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
正解：C
解説：
Reference:
http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNESS1876951_en- US_intl_181115175025_public_176152014821b385708e5290da11a0fe.pdf (14)
質問 # 37
www.company.com is a newly launched social portal for exchanging automotive information. The portal is based on PHP, including 10GB of images, and some JavaScripts files. Currently one single ECS instance is used to host all the application content as well as a MySQL database. With the growing number of users, the portal is getting slower to load images or respond to user requests. Moreover, there will be additional 50GB image content uploaded to the portal every week. Which combination of Alibaba Cloud services below can help resolve the storage and performance issue at the same time?
- A. OSS + ECS combination
- B. OSS + CDN combination
- C. OSS + MTS combination
- D. OSS + RDS combination
正解：B
解説：
Explanation
Object Storage Service (OSS) is a cloud storage service that provides secure, cost-effective, and scalable storage for various data types, such as images, videos, and documents. OSS can store large amounts of data and support concurrent access from multiple users. OSS can also integrate with other Alibaba Cloud services, such as Media Transcoding Service (MTS), Server Load Balancer (SLB), and Elastic Compute Service (ECS).
By using OSS, the portal can offload the storage and delivery of the image content from the ECS instance, which can improve the performance and availability of the application.
Content Delivery Network (CDN) is a distributed network that delivers content to users based on their geographic locations, the origin servers, and the content delivery policies. CDN can accelerate the delivery of static and dynamic content, such as images, videos, and web pages, by caching the content at edge nodes that are closer to the users. CDN can also reduce the network latency and bandwidth consumption, as well as enhance the security and reliability of the content delivery. By using CDN, the portal can speed up the loading of images and improve the user experience.
Therefore, the combination of OSS and CDN can help resolve the storage and performance issue of the portal at the same time. The other combinations are not as effective or suitable for the portal's scenario. OSS + MTS combination can help with the storage and transcoding of media files, but not with the delivery of images. OSS
+ RDS combination can help with the storage and management of relational databases, but not with the loading of images. OSS + ECS combination can help with the storage and computing of data, but not with the acceleration of content delivery.
References:
Alibaba Cloud Object Storage Service
Alibaba Cloud Content Delivery Network
ACA Cloud Computing Certification Exam Preparation Course
質問 # 38
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 target for DDoS attack is the database.
- B. 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.
- C. The purpose of DDoS attack is to steal confidential information.
- D. DDoS attack will try to crack the password through a large number of attempts.
正解：B
解説：
Explanation
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. Comprehensive and Detailed Explanation: A Distributed Denial-of-Service (DDoS) attack is a malicious attempt to disrupt the normal operation of a target server, service, or network by overwhelming it with a flood of internet traffic from multiple sources1. The main purpose of a 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. A DDoS attack can cause serious damage to the availability, performance, and reputation of the target server, service, or network, and result in significant financial losses and customer dissatisfaction2.
The other options are not accurate descriptions of a DDoS attack. The main target for a DDoS attack is not the database, but the server, service, or network that hosts the database or other applications. A DDoS attack will not try to crack the password through a large number of attempts, but rather try to exhaust the resources of the target server, service, or network. The purpose of a DDoS attack is not to steal confidential information, but rather to disrupt the normal operation of the target server, service, or network. References: 1: What is a DDoS Attack?1 2: Anti-DDoS: Intelligent DDoS Protection Service - Alibaba Cloud2
質問 # 39
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
正解：A
解説：
Explanation
According to the Alibaba Cloud Academy, 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.
One of the advantages of OSS is its high availability, which means that the data stored in OSS can be accessed anytime and anywhere with minimal downtime or interruption. OSS achieves high availability by ensuring data reliability of not less than 99.99999999%. Data reliability is the probability that the data stored in OSS is not lost or corrupted. OSS ensures data reliability by automatically backing up data with multiple redundant copies across different devices and facilities. Therefore, the option B is the correct answer that relates to the high availability of OSS. References: What is OSS? - Alibaba Object Storage Service Course - Cloud Academy, [Object Storage Service(OSS): Store Data Safely In The Cloud - Alibaba Cloud Blog]
質問 # 40
is a ready-to-use service that seamlessly integrates with Elastic Compute Service (ECS) to manage varying traffic levels without manual intervention.
- A. RDS
- B. Server Load Balancer
- C. OSS
- D. VPC
正解：B
質問 # 41
You are developing a highly available web application using stateless web servers. Which services are suitable for storing session state data? (Choose two.)
- A. Table Store
- B. OSS
- C. MaxCompute
- D. RDS
正解：B、D
質問 # 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. Based on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.
- B. Based on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred 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. 100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.
正解：C
質問 # 43
Auto Scaling can automatically remove unhealthy ECS instances from the scaling group (this feature is called Elastic Self-Health). Yet, after removal, the user has to manually add equivalent amount of new ECS instances back to the scaling group.
- A. TRUE
- B. FALSE
正解：A
質問 # 44
__________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. Weighted Round Robin
- B. health check
- C. session persistence
- D. least connections scheduling
正解：C
解説：
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
質問 # 45
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