Free ACA Alibaba Cloud Products and Services Questions and Answers — Questions and Answers
Question 1: Multiple lower-configuration I/O-optimized ECS instances can be used with ___________ to deliver a high-availability architecture.
- Server Load Balancer (Correct answer)
- RDS
- Auto Scaling
- OSS
Correct answer: Server Load Balancer
Explanation: <br> Server Load Balancer (SLB) distributes incoming traffic across multiple ECS instances to ensure high availability and fault tolerance. By deploying multiple lower-configuration I/O-optimized ECS instances behind an SLB, you can evenly distribute the workload and handle traffic spikes effectively. SLB monitors the health of ECS instances and automatically routes traffic to healthy instances, improving the reliability and availability of your application or service.
Question 2: What is the full name of ECS?
- Elastic Compute Service (Correct answer)
- Elastic Computing Server
- Elastic Cost Server
- Elastic Communication Server
Correct answer: Elastic Compute Service
Explanation: <br> Elastic Compute Service (ECS) is a core computing service offered by Alibaba Cloud, providing scalable and on-demand virtual servers for running applications and hosting websites. ECS allows users to deploy and manage virtual machines (instances) with flexible configurations, enabling them to quickly scale computing resources according to their needs.
Question 3: Alibaba Cloud does not support Intranet communication between products that are not in the same region, which does not mean ______________?
- ECS instances in different regions cannot communicate with each other on the intranet.
- ECS instances and other products in different regions, such as ApsaraDB for RDS and OSS instances, cannot communicate with each other on the intranet. (Correct answer)
- Server Load Balancer cannot be deployed for ECS instances in various regions.
- Server Load Balancer can be deployed for ECS instances in various regions.
Correct answer: ECS instances and other products in different regions, such as ApsaraDB for RDS and OSS instances, cannot communicate with each other on the intranet.
Explanation: <br> Alibaba Cloud does not support intranet communication between products (such as ECS instances, ApsaraDB for RDS, and OSS instances) that are not in the same region. This means that ECS instances and other products in different regions cannot communicate with each other on the intranet.
Question 4: If you are running an online ticket booking service with relatively fixed traffic, then which kind of charging mode is more suitable for you?
- Pay-As-You-Go (Correct answer)
- Prepaid Most Voted
- Paypal-pay
- Bitcoin-pay
Correct answer: Pay-As-You-Go
Explanation: <br> Pay-As-You-Go billing allows users to pay only for the resources they consume, based on usage. For a service with relatively fixed traffic like an online ticket booking service, Pay-As-You-Go billing ensures that costs align closely with actual usage. Since the traffic is relatively fixed, there may not be a need to prepay for resources upfront. Pay-As-You-Go provides flexibility and cost-effectiveness, especially when there are predictable traffic patterns.
Question 5: When we talk about the 'Elastic' feature for ECS product, we are not talking about _____________.
- Elastic Computing
- Elastic Storage
- Elastic Network
- Elastic Administration (Correct answer)
Correct answer: Elastic Administration
Explanation: <br> The term "Elastic" in ECS refers to the ability to dynamically adjust computing resources such as CPU, memory, and storage to accommodate changing workloads and demands. However, there isn't a specific feature called "Elastic Administration" within ECS. The other options, Elastic Computing, Elastic Storage, and Elastic Network, are indeed relevant features offered by ECS, allowing for flexible scaling and management of computing resources, storage capacity, and network configurations.
Question 6: Your website has a 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.
- Server Load Balancer
- Auto Scaling (Correct answer)
- RDS
- VPC
Correct answer: Auto Scaling
Explanation: <br> Auto Scaling automatically adjusts the number of ECS instances based on changes in demand or conditions. During sudden spikes in traffic, Auto Scaling can quickly provision additional instances to handle the increased load. This ensures that the system can efficiently manage traffic peaks and maintain a consistent user experience by dynamically scaling resources up or down as needed.
Question 7: Your website has oscillating traffic peaks that are difficult to predict in advance. In this scenario, it is recommended to use SLB and __________________ together with ECS.
- RDS
- VPC
- MaxCompute
- Auto Scaling (Correct answer)
Correct answer: Auto Scaling
Explanation: <br> SLB (Server Load Balancer) helps distribute incoming traffic across multiple ECS instances, ensuring load balancing and redundancy. Auto Scaling automatically adjusts the number of ECS instances based on fluctuating traffic demands, allowing your system to efficiently handle traffic peaks and troughs. By combining SLB and Auto Scaling, your system can dynamically scale resources up or down in response to traffic changes, maintaining performance and availability even during unpredictable traffic oscillations.
Question 8: ___________________ is a ready-to-use service that seamlessly integrates with Elastic Compute Service (ECS) to manage varying traffic levels without manual intervention.
- Server Load Balancer (Correct answer)
- OSS
- RDS
- VPC
Correct answer: Server Load Balancer
Explanation: <br> Server Load Balancer (SLB) automatically distributes incoming traffic across multiple ECS instances, ensuring that the workload is evenly distributed and each instance can handle its share of the traffic. SLB can detect changes in traffic patterns and adjust routing accordingly, dynamically scaling resources up or down as needed to maintain performance and availability. This helps manage varying traffic levels without the need for manual intervention.
Question 9: 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?
- We do not know the weight settings of the remaining 4 ECS instances, so we cannot tell what would happen. (Correct answer)
- 100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.
- Based on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.
- Based on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1.
Correct answer: We do not know the weight settings of the remaining 4 ECS instances, so we cannot tell what would happen.
Explanation: <br> Without knowing the weight settings of the remaining 4 ECS instances, we cannot determine how the traffic will be distributed among them. The weight setting determines the proportion of traffic that each backend ECS instance receives. Therefore, without this information, we cannot accurately predict the distribution of traffic among the instances.
Question 10: Server Load Balancer can help protect from _________________ attack.
- DDoS (Correct answer)
- Virus
- Ransomware
- SQL injection
Correct answer: DDoS
Explanation: <br> Server Load Balancer (SLB) can help mitigate DDoS attacks by distributing incoming traffic across multiple backend servers, thereby reducing the impact of a large volume of malicious traffic targeting a single server. SLB can detect and filter out abnormal traffic patterns associated with DDoS attacks, helping to ensure the availability and performance of the backend servers even during an attack.
Question 11: Which of the following statements to the OSS bucket is not correct?
- Every user can create more than one bucket
- Bucket name can be changed after the creation (Correct answer)
- Every bucket should have a unique name
- There is no limitation to object number inside one bucket
Correct answer: Bucket name can be changed after the creation
Explanation: <br> In Alibaba Cloud OSS (Object Storage Service), the bucket name cannot be changed after creation. Once a bucket is created, its name is immutable and cannot be modified. This is because the bucket name is used as part of the unique identifier for accessing the bucket's contents, and changing it could potentially disrupt existing applications or workflows that rely on the bucket's name.
Free ACA Alibaba Cloud Products and Services Questions and Answers
Multiple lower-configuration I/O-optimized ECS instances can be used with ___________ to deliver a high-availability architecture.