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アリババクラウドACA-Cloud1（ACA Cloud Computing Associate）認定試験は、クラウドコンピューティングに関する個人の知識とスキルをテストするプロフェッショナル認定試験です。この試験は、アリババクラウドサービスを使用してクラウドベースのソリューションを展開、構成、および管理する能力を認定するために設計されています。
この試験では、クラウドコンピューティング、クラウドアーキテクチャ、セキュリティとコンプライアンス、ストレージ、ネットワーキング、データベースの概念の基本など、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カバーしています。この試験は、クラウドリソースを管理および維持する個人の能力、およびさまざまなクラウドサービスの展開と管理方法の理解をテストするように設計されています。
質問 # 41
Cloud disks are reliable because they use __________ to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.
- A. a file system
- B. a distributed file management system with 3 redundant copies
- C. a double copy distributed system
- D. a Linux file system
正解：B
解説：
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.
Reference: http://docs-aliyun.cn-hangzhou.oss.aliyun-inc.com/pdf/ecs-product-introduction-intl-en-2017-03-
24.pdf
質問 # 42
Which of the followings are not the operations that you can do on a cloud disk snapshot? (Choose two.)
- A. snapshot download
- B. snapshot deletion
- C. snapshot duplicate
- D. snapshot rollback
正解：A、C
質問 # 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
正解：A
解説：
Explanation
Manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application with Server Load Balancer.
質問 # 44
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. One
- C. Zero
- D. Five
正解：C
質問 # 45
Which method is not supported by OSS to create a bucket?
- A. through cloud console
- B. through OSS API/SDK
- C. through oss cmd tool
- D. through ECS instance filesystem directory operation
正解：C
質問 # 46
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. Private
- C. Public-read
- D. Private-read
正解：A、B、C
解説：
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/100676.htm
質問 # 47
Server Load Balancer can help protect from attack.
- A. Virus
- B. DDoS
- C. SQL injection
- D. Ransomware
正解：B
解説：
Reference:
https://www.alibabacloud.com/help/doc-detail/27539.htm
質問 # 48
In mainland China, the approval requirements for business record filing vary depending on provincial communication management bureaus.
- A. TRUE
- B. FALSE
正解：A
解説：
Explanation
According to the Alibaba Cloud Academy, business record filing is a process of registering your website information with the provincial communication management bureau where your server is located. The approval requirements for business record filing vary depending on provincial communication management bureaus. Some provinces may require additional materials or procedures for business record filing. Therefore, the statement is true. References: ACA Cloud Computing Exam Preparation Course - Alibaba Cloud, Module
2: Cloud Computing Security, Lesson 2: Business Record Filing, Slide 3.
質問 # 49
Alibaba Cloud provides anti-DDoS products of different levels. If the service availability needs to be kept at
99.9% or higher under DDoS attacks, which of the following is the MOST suitable product?
- A. Anti-DDoS Service Basic
- B. Anti-DDoS Service Pro
- C. Managed Security Service
- D. Situation Awareness
正解：A
質問 # 50
Which three of the following statements about domain name binding to your OSS bucket are correct? (Choose three.)
- A. mapping a domain name to your bucket endpoint is mandatory
- B. Your customized domain name will be audited by Alibaba Cloud
- C. your customized domain name need to be put on record in MIIT (Ministry of Industry and Information Technology)
- D. the number of domain names you bind to one bucket can't exceed 20
正解：A、B、C
質問 # 51
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. OSS
- B. Container Service
- C. CDN
- D. ECS
正解：A
質問 # 52
An enterprise hosts their servers (include both Linux and Windows servers) in a traditional IDC. Every night hackers with IP addresses from many countries try to crack the password of their servers, making the administrator terribly worried about this. However, because of work requirements, the remote management port of these servers must be opened to public network.
The administrator heard that Alibaba Cloud has solutions that can help customers improve the security of their systems. Therefore, he/she wants to migrate the system to Alibaba Cloud. Which of the following functions should the administrator activate in Alibaba Cloud to reduce the possibility of brute force password cracking?
- A. Anti-DDoS Basic Service
- B. CloudMonitor
- C. Situation Awareness
- D. Server Guard
正解：D
質問 # 53
You can __________________ an ECS instance's configuration. (Choose two.)
- A. downgraded
- B. downloaded
- C. upgraded
- D. uploaded
正解：A、C
解説：
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/25437.htm
質問 # 54
When we talk about the 'Elastic' feature for ECS product, we are not talking about _____________.
- A. Elastic Network
- B. Elastic Computing
- C. Elastic Storage
- D. Elastic Administration
正解：D
質問 # 55
Which of the following statements to OSS bucket is not correct?
- A. There is no limitation to objects number inside one bucket
- B. Bucket name can be changed after creation
- C. Every bucket should have a unique name
- D. Every user can create more than one bucket
正解：B
解説：
Reference:
https://www.alibabacloud.com/help/doc-detail/31885.htm?spm=a2c63.p38356.a3.3.43f03bb9a3KjLl
質問 # 56
Cloud disks are reliable because they use_________ to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.
- A. a file system
- B. a distributed file management system with 3 redundant copies
- C. a double copy distributed system
- D. a Linux file system
正解：B
解説：
Explanation
Cloud disks are reliable because they use a distributed file management system with 3 redundant copies to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability. This means that the data stored on cloud disks is automatically replicated across three different physical servers in the same zone.
If one server fails, the data can still be accessed from the other two servers. Cloud disks also support snapshot backup and recovery, which can help users restore data to a previous point in time in case of accidental deletion or corruption. References: Elastic Compute Service (ECS) - Alibaba Cloud Academy, Cloud Disk - Alibaba Cloud Documentation Center 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.
質問 # 57
You can create a custom image for ECS using which of the followings? (Choose two.)
- A. System disk snapshot
- B. CPU snapshot
- C. Data disk snapshot
- D. Memory snapshot
正解：A、C
質問 # 58
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. simple web applications
- E. no limited online storage
正解：A、B、C、D
解説：
Explanation
A, B, C, and D are the correct answers according to the ACA Cloud Computing by Alibaba Cloud Academy Reference Materials and documents. Comprehensive and Detailed Explanation: = A, B, C, and D are the correct answers because ECS is a highly flexible service that 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:
Official corporate websites: ECS can host official corporate websites that require high performance, stability, reliability, and scalability. ECS can also support various web frameworks and languages, such as PHP, Java, Node.js, Python, and Ruby. ECS can also be integrated with other Alibaba Cloud products, such as SLB, CDN, and WAF, to improve the security, availability, and performance of the websites1 Large-traffic apps: ECS can handle large-traffic apps that require high concurrency, low latency, and high throughput. ECS can also scale up or down based on the real-time traffic demands, and use Auto Scaling to automate the scaling process. 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 apps2 Databases: ECS can run various database systems, such as MySQL, PostgreSQL, MongoDB, and Redis, to provide data storage and processing capabilities for different applications. ECS can also use cloud disks or local disks as the storage media for the databases, and choose different disk types, such as SSD, ESSD, and Ultra Disk, based on the performance and cost requirements. ECS can also use RDS or PolarDB to replace the self-managed databases, and enjoy the benefits of managed database services, such as backup, recovery, monitoring, and maintenance3 Simple web applications: ECS can run simple web applications that do not require complex architectures or high availability. ECS can provide fast memory and the latest CPUs to power the web applications and achieve faster results with low latency. ECS can also use OSS to store static files, such as images, videos, and documents, and reduce the storage cost and load of the ECS instances.
E is an incorrect answer because ECS is not a storage service that provides unlimited online storage. ECS is a compute service that provides virtual machines with limited storage capacity. ECS can use OSS or NAS to expand the storage capacity, but these are separate storage services that have their own pricing and billing methods.
References: 1: Build a Corporate Website 2: Build a Large-Traffic App 3: Build a Database System : [Build a Simple Web Application] : [ECS Overview]
質問 # 59
Which of the following statements about file uploading to OSS strategy is not correct?
- A. If you are uploading some small files (<1m), you can choose using put method to be able finish uploading in one http request.
- B. 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.
- C. If you need to upload very large file you better use multi-part uploading to get the capability of resuming from break point.
- D. All file uploading method provided by Alibaba Cloud OSS service will support resuming from break point.
正解：D
解説：
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
質問 # 60
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
正解：A
解説：
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
質問 # 61
is a ready-to-use service that seamlessly integrates with Elastic Compute Service (ECS) to manage varying traffic levels without manual intervention.
- A. Server Load Balancer
- B. OSS
- C. RDS
- D. VPC
正解：A
質問 # 62
Which 2 OSS object types can be configured as parameter for object lifecycle management? (Choose two.)
- A. Infrequent access
- B. Snapshot
- C. Chunk
- D. Archive
正解：A、D
解説：
Explanation
OSS object types are the storage classes that define the performance and cost of storing objects in OSS. OSS supports four object types: Standard, Infrequent Access (IA), Archive, and Cold Archive1. Each object type has different characteristics and scenarios, such as availability, durability, minimum storage duration, and storage overhead2.
Object lifecycle management is a feature that allows you to manage objects efficiently and minimize costs throughout the lifecycle of the objects in your bucket. Lifecycle settings create a set of rules that help define the actions that an OSS bucket must perform on a group of objects. For example, you can configure lifecycle rules to automatically delete expired objects, or convert the storage class of objects to a lower-cost object type3.
You can configure lifecycle rules based on the object type of the objects in your bucket. You can specify the object type as a parameter for the lifecycle rule, and OSS will apply the rule to the objects that match the object type. For example, you can create a lifecycle rule to convert the object type of objects from Standard to IA after 30 days, and then to Archive after 180 days4.
Therefore, the correct answer is A. Infrequent access and C. Archive, as these are two of the object types that can be configured as parameters for object lifecycle management. B. Snapshot and D. Chunk are not valid object types in OSS. References: 1: Overview of object types - Object Storage Service - Alibaba Cloud Documentation Center2: Object Storage Service (OSS) - Alibaba Cloud3: Manage Your OSS Storage Costs Using Lifecycle Policies - Alibaba Cloud4: Lifecycle rules based on the last modified time - Object Storage Service - Alibaba Cloud Documentation Center.
質問 # 63
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ACA-Cloud1 認定試験に応募するには、クラウドコンピューティングおよび関連技術の基本的な理解が必要です。受験はオンラインで行われ、90分以内に50の多肢選択問題に回答する必要があります。試験の合格スコアは65％です。
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