ACA-Cloud1事前に試験練習テストで使おう（最新74問題)
有効なACA-Cloud1試験解答PDF一年無料更新
Alibaba Cloud ACA-Cloud1：ACA Cloud Computing Associate Examは、クラウドコンピューティングの分野での個人の知識とスキルをテストするように設計されています。この試験は、クラウドコンピューティングの専門知識を実証し、認定されたAlibaba Cloud ACA Cloud Computing Associateとして認識を獲得したい専門家を対象としています。この認定プログラムは、クラウドコンピューティングにおける候補者の習熟度の証拠であり、Alibaba Cloud製品を操作する能力を検証します。
質問 # 11
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. We do not know the weight settings of the remaining 4 ECS instances, so we cannot tell what would happen.
- B. Based on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.
- C. Based on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1.
- D. 100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.
正解：A
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 # 12
You can create a custom image for ECS using which of the followings? (Choose two.)
- A. System disk snapshot
- B. Memory snapshot
- C. Data disk snapshot
- D. CPU snapshot
正解：A、C
質問 # 13
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 + CDN combination
- B. OSS + RDS combination
- C. OSS + ECS combination
- D. OSS + MTS combination
正解：A
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 # 14
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. Created
- B. Running
- C. Stopped
- D. Preparing
正解：B
解説：
Explanation
A is the correct answer because Auto Scaling supports adding existing ECS instances into the scaling group, whose status however must be running. Running means that the ECS instance is in a normal state and can provide services. Auto Scaling does not support adding ECS instances that are in other states, such as created, stopped, or preparing. Created means that the ECS instance has been created but has not been started yet.
Stopped means that the ECS instance has been stopped and cannot provide services. Preparing means that the ECS instance is being initialized and cannot provide services12 B, C, and D are incorrect answers because they are not valid states for adding existing ECS instances into the scaling group.
References: 1: Add existing ECS instances to a scaling group 2: ECS instance lifecycle
質問 # 15
Which of the following statements is true for RDS?
- A. Multiple databases can be created in one RDS instance.
- B. Resources are not shared among the databases in the same RDS instance.
- C. None of the above is true.
- D. Databases with the same name are allowed in the same instance.
正解：A
質問 # 16
A company uses Alibaba Cloud SLB and Auto Scaling at the same time, hoping this combination can help save O&M cost and provide a stable and reliable system.
However, because they do not have relevant experience, the company's engineers listed some precautions based on their understanding, and turned the list to you for advice.
As an expert of Alibaba Cloud, you tell them only________is correct.
- A. All backend servers under the same SLB instance must have the same configuration
- B. All ECS instances under the same SLB instance must be running on the same operating system
- C. All backend servers under the same SLB instance must be in the same Scaling Group
- D. SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
正解：D
解説：
Explanation
SLB and Auto Scaling are two Alibaba Cloud services that can work together to provide high availability, scalability, and performance for your applications. SLB is a load balancing service that distributes incoming traffic across multiple ECS instances. Auto Scaling is a service that automatically adjusts the number of ECS instances based on your business needs. When you use SLB and Auto Scaling together, you need to follow some best practices and precautions to ensure the optimal performance and reliability of your system. One of the precautions is that SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling1. Health Check is a feature of SLB that monitors the health status of the backend ECS instances.
If an ECS instance becomes unhealthy or fails, SLB automatically stops sending traffic to that instance and redirects the traffic to other healthy instances. This ensures that your application can continue to serve user requests without interruption. Health Check is also essential for Auto Scaling, because Auto Scaling relies on the health status reported by SLB to decide whether to add or remove ECS instances. If an ECS instance is unhealthy, Auto Scaling will automatically replace it with a new one. If the traffic increases and the average health status of the ECS instances decreases, Auto Scaling will automatically add more instances. If the traffic decreases and the average health status of the ECS instances increases, Auto Scaling will automatically remove some instances. Therefore, Health Check is a prerequisite for using SLB and Auto Scaling together. If you disable Health Check, SLB and Auto Scaling will not be able to communicate with each other and coordinate their actions. This may result in performance degradation, service interruption, or resource waste.
The other options are incorrect, because they are not necessary or relevant for using SLB and Auto Scaling together. The backend ECS instances under the same SLB instance can have different operating systems, configurations, and scaling groups, as long as they can provide the same service and respond to the same requests. SLB and Auto Scaling do not impose any restrictions on these aspects of the ECS instances.
References: Associate SLB instances with or disassociate SLB instances from a scaling group
質問 # 17
Server Load Balancer can manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application.
- A. FALSE
- B. TRUE
正解：B
解説：
Manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application with Server Load Balancer.
Reference:
https://arcelon.co.id/product/server_load_balancer.php
質問 # 18
A large shopping mall deploys a new video surveillance system. The five-floor building in which the mall is located installed 35 HD cameras to monitor the major exits. The surveillance system is deployed on an ECS instance, which has four 2 TB data disks to store video data.
However, video data grows rapidly and the engineers find that the ECS will run out of storage space within 2 weeks.
In this case, _____________ product is thought to be the best solution for addressing the storage challenge while ensuring quick access to historical video data when needed.
- A. CDN
- B. ECS
- C. Container Service
- D. OSS
正解：D
質問 # 19
Which of the following statements to OSS bucket is not correct?
- A. Bucket name can be changed after creation
- B. There is no limitation to objects number inside one bucket
- C. Every bucket should have a unique name
- D. Every user can create more than one bucket
正解：A
解説：
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/31885.htm?spm=a2c63.p38356.a3.3.43f03bb9a3KjLl
質問 # 20
A company uses Alibaba Cloud SLB and Auto Scaling at the same time, hoping this combination can help save O&M cost and provide a stable and reliable system.
However, because they do not have relevant experience, the company's engineers listed some precautions based on their understanding, and turned the list to you for advice.
As an expert of Alibaba Cloud, you tell them only is correct.
- A. All backend servers under the same SLB instance must have the same configuration
- B. All ECS instances under the same SLB instance must be running on the same operating system
- C. All backend servers under the same SLB instance must be in the same Scaling Group
- D. SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
正解：D
解説：
Reference:
https://www.alibabacloud.com/blog/comprehensive-upgrade-of-alibaba-cloud-auto-scaling- product_594112
質問 # 21
You canan ECS instance's configuration. (Choose two.)
- A. upgraded
- B. downloaded
- C. downgraded
- D. uploaded
正解：A、C
質問 # 22
Which three of the following statements about domain name binding to your OSS bucket are correct? (Choose three.)
- A. Your customized domain name will be audited by Alibaba Cloud
- B. the number of domain names you bind to one bucket can't exceed 20
- C. your customized domain name need to be put on record in MIIT (Ministry of Industry and Information Technology)
- D. mapping a domain name to your bucket endpoint is mandatory
正解：A、C、D
質問 # 23
Your website has high volume of traffic and sudden spikes for a very short time. In this scenario, can manage traffic peak efficiently and maintain a consistent user experience.
- A. Auto Scaling
- B. RDS
- C. Server Load Balancer
- D. VPC
正解：A
解説：
Reference:
https://www.alibabacloud.com/blog/designing-a-cloud-based-architecture-for-internet-of-vehicles- iov-series-ii_594263
質問 # 24
You can create a custom image for ECS using which of the followings? (Choose two.)
- A. System disk snapshot
- B. Memory snapshot
- C. Data disk snapshot
- D. CPU snapshot
正解：A、C
解説：
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/25460.htm
質問 # 25
A/Anis a copy of data on a disk at a certain point in time.
- A. EIP
- B. snapshot
- C. image
- D. template
正解：B
質問 # 26
As a cloud computing service provider, Alibaba Cloud provides security services including________. (Choose two.)
- A. Security operation for underlying hardware of cloud computing.
- B. IP white list setting for RDS.
- C. Security isolation between cloud computing tenants.
- D. Application maintenance in ECS instances.
正解：A、C
解説：
Reference:
https://www.alibabacloud.com/solutions/security
質問 # 27
Which of the following statements is true for RDS?
- A. Multiple databases can be created in one RDS instance.
- B. Resources are not shared among the databases in the same RDS instance.
- C. None of the above is true.
- D. Databases with the same name are allowed in the same instance.
正解：A
解説：
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/26092.htm
質問 # 28
Alibaba Cloud does not support Intranet communication between products that are not in the same region, which does not mean?
- A. ECS instances and other products in different regions, such as ApsaraDB for RDS and OSS instances, cannot communicate with each other on the intranet.
- B. ECS instances in different regions cannot communicate with each other on the intranet.
- C. Server Load Balancer cannot be deployed for ECS instances in various regions.
- D. Server Load Balancer can be deployed for ECS instances in various regions.
正解：A
質問 # 29
Which of the following statements is wrong when comparing RDS with self-built database?
- A. 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.
- B. 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.
- C. RDS requires no O&M while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.
- D. Self-built database supports quick deployment and elastic scaling.
正解：D
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 # 30
When we talk about the 'Elastic' feature for ECS product, we are not talking about.
- A. Elastic Computing
- B. Elastic Administration
- C. Elastic Storage
- D. Elastic Network
正解：B
質問 # 31
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. least connections scheduling
- C. health check
- D. session persistence
正解：D
解説：
Reference:
https://www.alibabacloud.com/help/doc-detail/55202.htm
質問 # 32
Server Load Balancer supports protocols like . (Choose four.)
- A. MQTT
- B. UDP
- C. HTTPS
- D. MPLS
- E. TCP
- F. HTTP
正解：B、C、E、F
解説：
Comprehensive protocol support - ICMP, TCP, UDP, HTTP, HTTPS,
Reference:
https://www.a10networks.com/resources/articles/server-load-balancing
質問 # 33
If you are running an online ticket booking service with relatively fixed traffic, then which kind of charging mode is more suitable for you?
- A. Pay-As-You-Go
- B. bitcoin-pay
- C. Prepaid
- D. Paypal-pay
正解：C
解説：
Explanation
Prepaid is a charging mode that allows you to pay in advance for a certain amount of resources for a specified period of time. It is also known as subscription or reserved instance. Prepaid is more suitable for scenarios with relatively fixed traffic, such as an online ticket booking service, because it offers lower prices and more stable performance than pay-as-you-go. Pay-as-you-go is a charging mode that allows you to pay only for the resources you actually use on an hourly basis. It is more suitable for scenarios with unpredictable or fluctuating traffic, such as a news website or a social media platform. Paypal-pay and bitcoin-pay are not valid charging modes for Alibaba Cloud Computing products.
References: 1: Alibaba Cloud Academy, "Charging Modes",
https://edu.alibabacloud.com/elearning/lesson/ACA-Cloud-Computing-Certification/lesson-1-charging-modes
質問 # 34
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 Self-Health
- C. Elastic Scale-In
- D. Elastic Scale-Out
正解：A
質問 # 35
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Alibaba Cloud ACA-Cloud1（ACA Cloud Computing Associate）試験は、クラウドコンピューティングに関する知識とスキルを証明するための価値のある認証資格です。この試験は、クラウドコンピューティングに関連する幅広いトピックを扱い、候補者のクラウドコンピューティングのコンセプトを実際のシナリオに適用する能力をテストします。ACA-Cloud1試験に合格することで、クラウドコンピューティングの分野でキャリアの展望を高めることができます。
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