[Dec-2023 Newly Released] Pass ACA-Cloud1 Exam - Real Questions and Answers
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NEW QUESTION # 22
Which method is not supported by OSS to create a bucket?
- A. through ECS instance filesystem directory operation
- B. through OSS API/SDK
- C. through oss cmd tool
- D. through cloud console
Answer: A
Explanation:
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.
NEW QUESTION # 23
ECS can be used along with_____to store static images, videos, and reducing storage fees.
- A. OSS
- B. VPC
- C. RDS
- D. Server Load Balancer
Answer: A
NEW QUESTION # 24
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. TRUE
- B. FALSE
Answer: A
Explanation:
Explanation
Server Load Balancer (SLB) is a service that distributes traffic among multiple ECS instances to improve the service capabilities of applications. SLB monitors the health of ECS instances in real time and automatically isolates unhealthy instances from the server pool according to the configured health check policy. This ensures that the traffic is only forwarded to healthy instances, thereby improving the availability and fault tolerance of applications. References: ACA Cloud Computing Certification - Alibaba Cloud Academy, E-Learning Courses
- Alibaba Cloud Academy, Server Load Balancer - Alibaba Cloud Documentation Center
NEW QUESTION # 25
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. 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.
- B. Configure Auto Scaling appropriately to automatically upgrade/downgrade the ECS instances.
- C. Configure Auto Scaling appropriately to automatically add or reduce ECS instances.
- D. 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.
Answer: C
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, using Auto Scaling is the most preferred method from the perspective of cost and implementation simplicity, as it can dynamically adjust the number of ECS instances according to the traffic fluctuations, without requiring manual operations or wasting resources. The other methods are either too complex, inefficient, or costly to implement. 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 # 26
Which of the following ECS instance configurations can't be changed if we don't change instance type?
- A. Number of data disk
- B. System disk size
- C. Mem size
- D. Data disk size
Answer: C
Explanation:
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
NEW QUESTION # 27
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. By adding a SLB instance and increase the number of ECS instances to reduce the work load on current ECS instances.
- B. Use content delivery network, CDN, to accelerate the caching of the platform's css, JavaScript files etc.
- C. Import data into OSS to share the storage load of the platform.
- D. 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.
Answer: A,D
NEW QUESTION # 28
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. Data Reliability is not less than 99.99999999%. Data is backed up automatically with multiple redundant copies.
- B. The following features are available: Multiple Authentication and Authorization mechanism, Whitelist, Anti- leech URL, and Master-Sub Account
- C. Data has to be backed up by customer manually, which is time-consuming and labor-intensive.
- D. 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.
Answer: A
NEW QUESTION # 29
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. Based on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.
- B. Based on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1.
- C. We do not know the weight settings of the remaining 4 ECS instances, so we cannot tell what would happen.
- D. 100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.
Answer: C
Explanation:
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
NEW QUESTION # 30
Server Load Balancer can help protect from attack.
- A. Virus
- B. SQL injection
- C. DDoS
- D. Ransomware
Answer: C
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/27539.htm
NEW QUESTION # 31
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. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 32
As a cloud computing service provider, Alibaba Cloud provides security services including________. (Choose two.)
- A. Application maintenance in ECS instances.
- B. Security operation for underlying hardware of cloud computing.
- C. Security isolation between cloud computing tenants.
- D. IP white list setting for RDS.
Answer: B,C
Explanation:
Reference:
https://www.alibabacloud.com/solutions/security
NEW QUESTION # 33
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
Answer: D
NEW QUESTION # 34
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. Prepaid
- B. Pay-As-You-Go
- C. bitcoin-pay
- D. Paypal-pay
Answer: B
NEW QUESTION # 35
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
Answer: A
Explanation:
Explanation
A is the correct answer because Server Load Balancer (SLB) can manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application. SLB distributes network traffic across groups of backend servers to improve the service capability and application availability. It includes Layer 4 Network Load Balancer (NLB), Layer 7 Application Load Balancer (ALB), and Classic Load Balancer (CLB). SLB provides high-performance load balancing services with super four-seven processing capabilities. SLB also provides disaster recovery at four levels for high availability and supports built-in Anti-DDoS services to ensure business security. SLB supports multiple protocols, such as TCP, UDP, HTTP, HTTPS, QUIC, and gRPC. SLB also supports cloud-native networks and is integrated with other cloud-native services, such as Container Service for Kubernetes (ACK), Serverless App Engine (SAE), and Kubernetes123 References: 1: SLB Overview 2: SLB Types & Pricing 3: What is ALB?
Manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application with Server Load Balancer.
NEW QUESTION # 36
Anti-DDoS is one of the major features in Alibaba Cloud Security Service. Many websites have experienced different types of DDoS attacks, an accurate understanding of DDoS is crucial to protecting websites. Which of the following descriptions about DDoS attack is the most accurate one?
- A. The purpose of DDoS attack is to steal confidential information.
- B. The main purpose of DDoS attack is to make the target server unable to provide service normally, which is one of the network attacks that are most difficult to defend.
- C. DDoS attack will try to crack the password through a large number of attempts.
- D. The main target for DDoS attack is the database.
Answer: B
NEW QUESTION # 37
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. simple web applications
- B. Databases
- C. Official corporate websites
- D. large-traffic apps
- E. no limited online storage
Answer: A,B,C,D
Explanation:
Explanation/Reference:
NEW QUESTION # 38
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. Server Load Balancer cannot be deployed for ECS instances in various regions.
- C. Server Load Balancer can be deployed for ECS instances in various regions.
- D. ECS instances in different regions cannot communicate with each other on the intranet.
Answer: A
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/40654.htm
NEW QUESTION # 39
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. simple web applications
- B. Databases
- C. Official corporate websites
- D. large-traffic apps
- E. no limited online storage
Answer: A,B,C,D
NEW QUESTION # 40
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. Situation Awareness
- C. Managed Security Service
- D. Anti-DDoS Service Pro
Answer: A
NEW QUESTION # 41
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. VPC
- C. RDS
- 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 # 42
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. Self-built database supports quick deployment and elastic scaling.
- C. 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.
- D. RDS requires no O&M while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.
Answer: B
NEW QUESTION # 43
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