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NEW QUESTION # 44
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. Paypal-pay
- B. bitcoin-pay
- C. Pay-As-You-Go
- D. Prepaid
Answer: D
Explanation:
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
NEW QUESTION # 45
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 Pro
- B. Anti-DDoS Service Basic
- C. Managed Security Service
- D. Situation Awareness
Answer: B
NEW QUESTION # 46
Server Load Balancer can help protect from ___________________ attack.
- A. Ransomware
- B. Virus
- C. SQL injection
- D. DDoS
Answer: D
Explanation:
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/27539.htm
NEW QUESTION # 47
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. ECS
- C. Container Service
- D. CDN
Answer: A
NEW QUESTION # 48
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. FALSE
- B. TRUE
Answer: A
NEW QUESTION # 49
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. Preparing
- C. Stopped
- D. Running
Answer: D
Explanation:
Explanation/Reference: http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNESS1876951_en- US_intl_181115175025_public_176152014821b385708e5290da11a0fe.pdf (14)
NEW QUESTION # 50
Cloud disks are reliable because they use __________ to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.
- A. a double copy distributed system
- B. a file system
- C. a Linux file system
- D. a distributed file management system with 3 redundant copies
Answer: D
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 # 51
When we talk about the 'Elastic' feature for ECS product, we are not talking about _____________.
- A. Elastic Network
- B. Elastic Computing
- C. Elastic Administration
- D. Elastic Storage
Answer: C
Explanation:
Explanation/Reference:
NEW QUESTION # 52
Server Load Balancer can help protect fromattack.
- A. Ransomware
- B. Virus
- C. SQL injection
- D. DDoS
Answer: D
NEW QUESTION # 53
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 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.
- B. 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.
- C. 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.
- D. 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.
Answer: B,C,D
NEW QUESTION # 54
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. CloudMonitor
- B. Server Guard
- C. Anti-DDoS Basic Service
- D. Situation Awareness
Answer: B
Explanation:
Explanation/Reference: https://www.alibabacloud.com/blog/blogblogalibaba-cloud-server-guard-a-comprehensive- assessment_284390
NEW QUESTION # 55
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 # 56
A company wants to migrate its system to public cloud platform and they choose Alibaba Cloud. The migration process is very important and they want to ensure that everything works right. Which of the following services can the company choose?
- A. Event Management Service
- B. Alibaba Cloud Product Operation Training
- C. Aftersales Support
- D. Alibaba Cloud Architecture Design Training
Answer: D
NEW QUESTION # 57
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. ICP Support
- B. Connect your service with Alibaba Group ecosystem
- C. Office registration support
- D. Web hosting
Answer: D
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 # 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. large-traffic apps
- B. Databases
- C. no limited online storage
- D. Official corporate websites
- E. simple web applications
Answer: A,B,D,E
Explanation:
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]
NEW QUESTION # 59
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. Five
- C. Six
- D. Zero
Answer: D
NEW QUESTION # 60
Multiple lower-configuration I/O-optimized ECS instances can be used with to deliver a high- availability architecture.
- A. RDS
- B. Auto Scaling
- C. OSS
- D. Server Load Balancer
Answer: D
NEW QUESTION # 61
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. Migrates music files from the OSS to the data disks for ECS instances.
- C. Limits access sources by configuring "Anti-leech settings" of OSS bucket attributes.
- D. Changes the website access mode to HTTPS.
Answer: C
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 # 62
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Alibaba Cloud ACA-Cloud1 Exam is a certification exam designed to validate an individual's knowledge and skills in the field of cloud computing. ACA-Cloud1 exam is intended for those who are interested in pursuing a career in cloud computing, or for those who are already working in the field and want to enhance their knowledge and credibility.
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