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Alibaba Cloud ACA-Cloud1 (ACA Cloud Computing Associate) Certification Exam is a professional certification offered by Alibaba Cloud to validate the skills and knowledge of individuals in cloud computing. ACA Cloud Computing Associate certification is designed for individuals who are interested in cloud computing and want to develop their skills and knowledge in this area.
Alibaba Cloud ACA-Cloud1 (ACA Cloud Computing Associate) Exam is a certification exam designed for individuals who are interested in validating their knowledge and skills in cloud computing. ACA-Cloud1 exam is designed to test the candidate's understanding of cloud computing concepts, architecture, and technologies. The ACA-Cloud1 exam is an entry-level certification that provides a foundation for individuals who want to pursue a career in cloud computing.
NEW QUESTION # 24
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. You cannot obtain any help from Alibaba Cloud.
- C. Look for answers in Alibaba Cloud forum.
- D. Open a ticket to Alibaba Cloud help desk.
Answer: A,C,D
NEW QUESTION # 25
Company builds a music download website based on OSS and ECS, and users can download mp3 files after registering for the website. Recently, the public network traffic to the OSS has doubled but the increase of registered users is less than 10%. After in-depth analysis, engineers find that many user download requests are raised from search engine but not the website itself. In this case, which of the following measures is thought to be able to address this issue.
- A. Introduce SLB for extra protection.
- B. Limits access sources by configuring "Anti-leech settings" of OSS bucket attributes.
- C. Changes the website access mode to HTTPS.
- D. Migrates music files from the OSS to the data disks for ECS instances.
Answer: B
Explanation:
Explanation
The issue that Company B faces is that their music files stored in OSS are being downloaded by unauthorized users who access them through search engines, rather than through their website. This is called leeching, which is a form of bandwidth theft that consumes the OSS traffic and increases the cost for Company B. To address this issue, Company B can limit the access sources by configuring the "Anti-leech settings" of OSS bucket attributes. Anti-leech settings allow the bucket owner to specify a referer whitelist, which is a list of domain names that are allowed to access the OSS resources. The referer is a part of the HTTP header that indicates the source URL of the request. By setting a referer whitelist, Company B can prevent leeches from accessing their music files directly from search engines or other websites, and only allow access from their own website domain name. This way, Company B can protect their OSS resources from unauthorized access and reduce their OSS traffic costs. The other options are not effective or relevant for addressing the issue.
Migrating music files from OSS to data disks for ECS instances would increase the storage and computing costs for Company B, and also reduce the scalability and availability of their music files. Changing the website access mode to HTTPS would enhance the security and encryption of the website, but it would not prevent leeches from accessing the OSS resources through search engines. Introducing SLB for extra protection would improve the load balancing and high availability of the ECS instances, but it would not affect the access control of the OSS resources. References: OSS Anti-Leech Referer Configuration and Error Elimination
NEW QUESTION # 26
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 double copy distributed system
- C. a distributed file management system with 3 redundant copies
- D. a Linux file system
Answer: C
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.
Reference:
http://docs-aliyun.cn-hangzhou.oss.aliyun-inc.com/pdf/ecs-product-introduction-intl-en-2017-03- 24.pdf
NEW QUESTION # 27
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. mapping a domain name to your bucket endpoint is mandatory
- 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
Answer: A,C,D
Explanation:
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.
NEW QUESTION # 28
You can create a custom image for ECS using which of the followings? (Choose two.)
- A. Data disk snapshot
- B. Memory snapshot
- C. CPU snapshot
- D. System disk snapshot
Answer: A,D
NEW QUESTION # 29
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. VPC
- D. Server Load Balancer
Answer: A
Explanation:
Explanation
Auto Scaling is a service that automatically adjusts computing resources based on your volume of user requests. When the demand for computing resources increases, Auto Scaling automatically adds ECS instances to serve additional user requests, or alternatively removes instances in the case of decreased user requests1. Auto Scaling can help you manage traffic peaks efficiently and maintain a consistent user experience by scaling up or down your ECS instances according to your predefined policies and business needs2. References: 1: Auto Scaling: Automatically Adjusts Computing Resources - Alibaba Cloud2: Overview - Auto Scaling - Alibaba Cloud Documentation Center.
NEW QUESTION # 30
You can an ECS instance's configuration. (Choose two.)
- A. downgraded
- B. downloaded
- C. upgraded
- D. uploaded
Answer: A,C
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/25437.htm
NEW QUESTION # 31
Which of the followings are not the operations that you can do on a cloud disk snapshot? (Choose two.)
- A. snapshot rollback
- B. snapshot deletion
- C. snapshot download
- D. snapshot duplicate
Answer: C,D
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/52045.htm#section-1ff-9s6-3i5
NEW QUESTION # 32
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. Web application
- B. Database
- C. Confidential files on the server
- D. Pictures on server
Answer: B
NEW QUESTION # 33
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. FALSE
- B. TRUE
Answer: A
Explanation:
Explanation
B is the correct answer because Auto Scaling can automatically remove unhealthy ECS instances from the scaling group, and also automatically add equivalent amount of new ECS instances back to the scaling group.
This feature is called Elastic Self-Health, and it can improve the availability and reliability of the scaling group. Elastic Self-Health can be enabled or disabled in the scaling group settings. When Elastic Self-Health is enabled, Auto Scaling monitors the health status of the ECS instances in the scaling group based on the health check results of the Server Load Balancer (SLB) instances that are associated with the scaling group. If an ECS instance is detected as unhealthy by SLB for a specified period of time, Auto Scaling removes the unhealthy ECS instance from the scaling group and releases it. Then, Auto Scaling triggers a scale-out event to add a new ECS instance to the scaling group to maintain the desired capacity12 References: 1: Elastic Self-Health 2: Enable or disable Elastic Self-Health
NEW QUESTION # 34
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. session persistence
- C. health check
- D. Weighted Round Robin
Answer: B
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/55202.htm
NEW QUESTION # 35
You are developing a highly available web application using stateless web servers. Which services are suitable for storing session state data? (Choose two.)
- A. MaxCompute
- B. Table Store
- C. RDS
- D. OSS
Answer: C,D
NEW QUESTION # 36
Alibaba Cloud provides powerful security services (the same level of security services used to support Alibaba Group double 11 shopping festival). However, you have to pay first before using any of the security services.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
Explanation
According to the Alibaba Cloud Academy, Alibaba Cloud provides powerful security services that are the same level of security services used to support Alibaba Group's Double 11 Shopping Festival. However, you do not have to pay first before using any of the security services. Alibaba Cloud offers some security services for free, such as Anti-DDoS Basic, Server Guard, and Security Center Basic Edition. Other security services, such as Anti-DDoS Pro, WAF, and Security Center Enterprise Edition, are charged based on different billing methods, such as subscription, pay-as-you-go, or traffic-based. Therefore, the statement is false. References: Alibaba Cloud Security Services - Alibaba Cloud Security Course - Cloud Academy, Alibaba Cloud Security Pricing - Alibaba Cloud
NEW QUESTION # 37
Server Load Balancer supports health checks for ECS instances and allows user to specify the frequency. If an ECS instance does not qualify the health check, traffic will not be forwarded to that instance, thereby ensuring application availability.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
Explanation
NEW QUESTION # 38
Alibaba Cloud China Connect is a service that can help international companies do business in China. Which of the following services is not included in China Connect?
- A. Office registration support
- B. Web hosting
- C. ICP Support
- D. Connect your service with Alibaba Group ecosystem
Answer: B
Explanation:
Explanation
Alibaba Cloud China Connect is a service that can help international companies do business in China by providing them with the necessary infrastructure, compliance, and ecosystem support1. China Connect includes the following services1:
ICP Support: Alibaba Cloud helps you obtain the Internet Content Provider (ICP) license, which is required for any website hosted in mainland China.
Office registration support: Alibaba Cloud helps you register a legal entity in mainland China, which is required for some business scenarios such as e-commerce, online payment, and social media.
Connect your service with Alibaba Group ecosystem: Alibaba Cloud helps you leverage the Alibaba Group ecosystem, which includes platforms such as Taobao, Tmall, Alipay, and DingTalk, to reach millions of potential customers and partners in China.
However, China Connect does not include web hosting, which is a service that allows you to store and deliver your website content on Alibaba Cloud servers. Web hosting is a separate service that you can purchase from Alibaba Cloud, and it is not part of China Connect.
References: 1: Alibaba Cloud, "China Connect", https://www.alibabacloud.com/chinaconnect
NEW QUESTION # 39
Some applications may encounter large traffic fluctuations within a short period. When ECS is used with
__________ , the number of ECS instances is automatically adjusted based on traffic.
- A. OSS
- B. Auto Scaling
- C. RDS
- D. Server Load Balancer
Answer: B
Explanation:
Explanation
According to the Alibaba Cloud Academy, Auto Scaling is a service that automatically creates and releases ECS instances based on pre-defined rules in order to scale services to match demand. Furthermore, it can configure server load balancer and relational database service white lists, without any manual intervention.
Therefore, when ECS is used with Auto Scaling, the number of ECS instances is automatically adjusted based on traffic. References: Introduction to Alibaba Auto Scaling - Cloud Academy, ACA Cloud Computing Exam Preparation Course - Alibaba Cloud, Module 4: Cloud Computing Elasticity, Lesson 1: Auto Scaling, Slide 2.
NEW QUESTION # 40
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 # 41
Which of the following statements is true for RDS?
- A. Databases with the same name are allowed in the same instance.
- B. Resources are not shared among the databases in the same RDS instance.
- C. None of the above is true.
- D. Multiple databases can be created in one RDS instance.
Answer: D
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/26092.htm
NEW QUESTION # 42
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. Private
- B. Public-read-write
- C. Public-read
- D. Private-read
Answer: A,B,C
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/100676.htm
NEW QUESTION # 43
Company A builds a sales management platform based on Alibaba Cloud services, using 3 ECS instances. One of the ECS instance has MySQL installed as the database server of the platform, the other two are used as WEB servers. After some time, due to the rapid increase of employees and sales analysis requests, the performance of the platform is challenged in terms of response time. Through CloudMonitor, it is found that the average CPU usage reaches 70% for the two WEB server ECS instances and the database load reaches 75% for the database server ECS instance. In this situation, company A may choose which Alibaba Cloud services to improve the performance . (Choose two.)
- A. Use content delivery network, CDN, to accelerate the caching of the platform's css, JavaScript files etc.
- B. Use RDS to replace existing self-built database, in order to obtain better database performance; also creating RDS read-only instances to handle read-only requests, hence reduce the work load on master RDS instance.
- C. By adding a SLB instance and increase the number of ECS instances to reduce the work load on current ECS instances.
- D. Import data into OSS to share the storage load of the platform.
Answer: B,C
NEW QUESTION # 44
You can create a custom image for ECS using which of the followings? (Choose two.)
- A. Data disk snapshot
- B. Memory snapshot
- C. CPU snapshot
- D. System disk snapshot
Answer: A,D
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/25460.htm
NEW QUESTION # 45
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