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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 # 18
Which of the following statements to OSS bucket is not correct?
- A. Every user can create more than one bucket
- B. Bucket name can be changed after creation
- C. Every bucket should have a unique name
- D. There is no limitation to objects number inside 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 # 19
You built an online shop using Alibaba Cloud services (ECS, RDS, ...etc.) and very soon you'll have a campaign that every customer that invites 3 friends will get a 50% off coupon. To avoid HTTP flood attacks and ensure only genuine customers (not bots) joining the event, which security product should you choose?
- A. Anti-DDoS Basic
- B. WAF
- C. Server Guard
- D. Anti-DDoS pro
正解：B
解説：
After adding your website to the WAF protection list, you can enable HTTP Flood protection and select an appropriate protection mode for the website Reference: https://www.alibabacloud.com/help/doc-detail/43443.htm
質問 # 20
Cloud disks are reliable because they use_________to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.
- A. a Linux file system
- B. a double copy distributed system
- C. a distributed file management system with 3 redundant copies
- D. a file system
正解：C
解説：
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.
質問 # 21
Using a cloud computing service is simple and straightforward. One can choose the instance with desired specification, finish payment and then use it right away. Moreover, the underlying physical machines are managed by cloud service providers and transparent to users.
- A. FALSE
- B. TRUE
正解：B
質問 # 22
Which of the following ECS instance configurations can't be changed if we don't change instance type?
- A. Number of data disk
- B. Mem size
- C. System disk size
- D. Data disk size
正解：B
解説：
Explanation
= A is the correct answer because the memory size of an ECS instance is determined by the instance type, and it cannot be changed independently. If you want to change the memory size of an ECS instance, you must change the instance type to another one that has a different memory size12 B, C, and D are incorrect answers because the system disk size, data disk size, and number of data disks of an ECS instance can be changed without changing the instance type. You can use the ECS console or API to resize the system disk or data disks of an ECS instance, or add or remove data disks from an ECS instance3456 References: 1: Overview of instance families 2: Change the instance type 3: Resize disks 4: Resize a disk 5: Attach or detach data disks 6: Attach or detach a data disk
質問 # 23
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. Running
- B. Preparing
- C. Stopped
- D. Created
正解：A
質問 # 24
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. RDS
- B. Auto Scaling
- C. Server Load Balancer
- D. VPC
正解：B
解説：
Reference:
https://www.alibabacloud.com/blog/designing-a-cloud-based-architecture-for-internet-of-vehicles- iov-series-ii_594263
質問 # 25
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. 100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.
- C. Based on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.
- D. Based on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1.
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 # 26
As a cloud computing service provider, Alibaba Cloud provides security services including. (Choose two.)
- A. IP white list setting for RDS.
- B. Security isolation between cloud computing tenants.
- C. Application maintenance in ECS instances.
- D. Security operation for underlying hardware of cloud computing.
正解：B、D
解説：
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
質問 # 27
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
解説：
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
質問 # 28
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. Self-built database supports quick deployment and elastic scaling.
- D. RDS requires no O&M while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.
正解：C
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 # 29
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 "Adjust to 10 ECS instances", and creates a scheduled task based on this rule.
And then, the customer checks the scaling group and see it already contains 6 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. Eight
- B. Five
- C. Ten
- D. Six
正解：B
質問 # 30
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. One
- B. Zero
- C. Five
- D. Six
正解：B
解説：
Explanation
質問 # 31
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. Container Service
- C. ECS
- D. OSS
正解：D
質問 # 32
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. 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.
- B. Data Reliability is not less than 99.99999999%. Data is backed up automatically with multiple redundant copies.
- C. The following features are available: Multiple Authentication and Authorization mechanism, Whitelist, Anti- leech URL, and Master-Sub Account
- D. Data has to be backed up by customer manually, which is time-consuming and labor-intensive.
正解：B
質問 # 33
SQL injection is a common application layer attack, usually through building special input parameters and pass it to web applications to steal or sabotage the application data. Which of the following is the target for SQL injection?
- A. Database
- B. Web application
- C. Pictures on server
- D. Confidential files on the server
正解：A
解説：
Explanation/Reference: https://www.rapid7.com/fundamentals/sql-injection-attacks/
質問 # 34
Which method is not supported by OSS to create a bucket?
- A. through OSS API/SDK
- B. through ECS instance filesystem directory operation
- C. through oss cmd tool
- D. through cloud console
正解：B
解説：
Explanation
ECS instance filesystem directory operation is not a supported method to create a bucket in OSS. A bucket is a container for objects in OSS, and it is not related to the filesystem of an ECS instance. To create a bucket in OSS, you can use one of the following methods1:
through OSS API/SDK: You can use the OSS API or SDK to call the PutBucket operation to create a bucket. The OSS API and SDK support various programming languages, such as Java, Python, PHP, C#, and Node.js2.
through oss cmd tool: You can use the oss cmd tool, which is a command-line tool based on the OSS SDK for Python, to create a bucket by using the ossutil mb command3.
through cloud console: You can use the Alibaba Cloud console to create a bucket by following the steps in the documentation4. References: 1: Create buckets - Object Storage Service - Alibaba Cloud Documentation Center2: PutBucket - API Reference| Alibaba Cloud Documentation Center3: Create a bucket - OSSUTIL User Guide| Alibaba Cloud Documentation Center4: Create a bucket - Object Storage Service - Alibaba Cloud Documentation Center.
質問 # 35
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. Situation Awareness
- C. Server Guard
- D. CloudMonitor
正解：C
解説：
Explanation
Server Guard is a cloud-based security service that provides real-time protection for servers against intrusion events, such as brute force password cracking. Server Guard consists of a lightweight agent that is installed on the server and a cloud protection center that analyzes and responds to security threats. Server Guard can help the administrator to reduce the possibility of brute force password cracking by providing the following features1:
Password cracking protection: Server Guard can detect and block password cracking attempts on servers, such as SSH brute force attacks on Linux servers and RDP brute force attacks on Windows servers. Server Guard can also alert the administrator of the attack source, time, and frequency, and provide suggestions for password strengthening.
Webshell detection and removal: Server Guard can scan and remove webshells that are maliciously implanted on servers by hackers. Webshells are scripts that allow hackers to remotely execute commands on servers, such as stealing data, uploading files, or launching attacks. Server Guard can identify and delete webshells based on signature matching, behavior analysis, and machine learning.
Anti-virus and anti-ransomware: Server Guard can detect and terminate various types of malware, such as ransomware, mining programs, backdoor programs, worms, and trojans. Server Guard can also prevent the encryption and deletion of files by ransomware, and restore the files to their original state.
Security baseline check: Server Guard can perform security baseline checks on servers to evaluate their security posture and compliance level. Server Guard can check more than 40 security items, such as system configuration, account management, network security, and log audit. Server Guard can also provide security hardening suggestions and one-click fixes for the detected issues.
Security situation awareness: Server Guard can provide a comprehensive and visualized view of the security situation of the servers, such as the number of attacks, the attack sources, the attack types, the attack trends, and the security score. Server Guard can also provide security reports and recommendations for improving the security level of the servers. References: Security Center
質問 # 36
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 add or reduce ECS instances.
- C. Configure Auto Scaling appropriately to automatically upgrade/downgrade the 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.
正解：B
解説：
Reference:
https://www.alibabacloud.com/product/auto-scaling
質問 # 37
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 need to be put on record in MIIT (Ministry of Industry and Information Technology)
- C. Your customized domain name will be audited by Alibaba Cloud
- D. the number of domain names you bind to one bucket can't exceed 20
正解：B、C、D
解説：
Explanation
Domain name binding is a feature that allows you to use your own domain name to access your OSS bucket, instead of using the default OSS domain name. Domain name binding has the following requirements and limitations12:
Your customized domain name will be audited by Alibaba Cloud. You need to submit a domain name binding request and wait for approval before you can use your own domain name to access your OSS bucket.
Your customized domain name need to be put on record in MIIT (Ministry of Industry and Information Technology). This is a mandatory requirement for all websites that are hosted in mainland China. You need to provide your domain name information and relevant documents to MIIT and obtain an ICP filing number before you can use your own domain name to access your OSS bucket.
質問 # 38
SQL injection is a common application layer attack, usually through building special input parameters and pass it to web applications to steal or sabotage the application data. Which of the following is the target for SQL injection?
- A. Database
- B. Web application
- C. Pictures on server
- D. Confidential files on the server
正解：A
質問 # 39
___________ 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/Reference: https://www.alibabacloud.com/help/doc-detail/55202.htm
質問 # 40
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. RDS
- B. Auto Scaling
- C. Server Load Balancer
- D. VPC
正解：B
解説：
Explanation/Reference: https://www.alibabacloud.com/blog/designing-a-cloud-based-architecture-for-internet-of-vehicles- iov-series-ii_594263
質問 # 41
A/Anis a copy of data on a disk at a certain point in time.
- A. template
- B. snapshot
- C. image
- D. EIP
正解：B
質問 # 42
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