Important Alibaba ACA-Cloud1 Exam Questions

Answer: C

Explanation:

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.Comprehensive and Detailed A Distributed Denial-of-Service (DDoS) attack is a malicious attempt to disrupt the normal operation of a target server, service, or network by overwhelming it with a flood of internet traffic from multiple sources1. The main purpose of a 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.A DDoS attack can cause serious damage to the availability, performance, and reputation of the target server, service, or network, and result in significant financial losses and customer dissatisfaction2.

The other options are not accurate descriptions of a DDoS attack. The main target for a DDoS attack is not the database, but the server, service, or network that hosts the database or other applications. A DDoS attack will not try to crack the password through a large number of attempts, but rather try to exhaust the resources of the target server, service, or network.The purpose of a DDoS attack is not to steal confidential information, but rather to disrupt the normal operation of the target server, service, or network.Reference:1: What is a DDoS Attack?12: Anti-DDoS: Intelligent DDoS Protection Service - Alibaba Cloud2

Answer: A

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 Kubernetes123Reference:1:SLB Overview2:SLB Types & Pricing3:What is ALB?

Manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application with Server Load Balancer.

Answer: D

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.

[Alibaba Cloud Elastic Compute Service]

ACA Cloud Computing Certification Exam Preparation Course

Alibaba Cloud ACA-Cloud1 ACA Cloud Computing Certification Exam

Answer: A

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.Reference:ACA Cloud Computing Certification - Alibaba Cloud Academy,E-Learning Courses - Alibaba Cloud Academy, Server Load Balancer - Alibaba Cloud Documentation Center

Answer: A

Explanation:

RDS allows users to create multiple databases in one RDS instance, as long as the total storage capacity and performance of the instance are not exceeded. This can help users save costs and simplify management. Users can create, delete, and manage databases in the RDS console or by using SQL commands. However, databases with the same name are not allowed in the same instance, and resources are shared among the databases in the same RDS instance, such as CPU, memory, disk, and network bandwidth.Reference:Operate and Manage a Relational Database on the Cloud,Alibaba RDS Course | Cloud Academy,ACA Cloud Computing Certification - Alibaba Cloud Academy