ACA-Cloud1 Exam Questions & Answers

According to the Alibaba Cloud Academy, 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. One of the advantages of OSS is its high availability, which means that the data stored in OSS can be accessed anytime and anywhere with minimal downtime or interruption. OSS achieves high availability by ensuring data reliability of not less than 99.99999999%. Data reliability is the probability that the data stored in OSS is not lost or corrupted. OSS ensures data reliability by automatically backing up data with multiple redundant copies across different devices and facilities. Therefore, the option B is the correct answer that relates to the high availability of OSS.Reference:What is OSS? - Alibaba Object Storage Service Course - Cloud Academy, [Object Storage Service(OSS): Store Data Safely In The Cloud - Alibaba Cloud Blog]

According to the Alibaba Cloud Academy, Alibaba Cloud's object storage service (OSS) is a cloud storage service that enables you to store, backup, and archive any amount of data in the cloud. OSS is a cost-effective, highly secure, and highly reliable cloud storage solution. The capacity of each bucket is unlimited, and there is no limit on the number of files in a single bucket. Therefore, the statement is false.Reference:What is OSS? - Alibaba Object Storage Service Course - Cloud Academy,Object Storage Service(OSS): Store Data Safely In The Cloud - Alibaba Cloud Blog

Alibaba Cloud OSS service provides different methods for file uploading, such as simple upload, multipart upload, append upload, and resumable upload1. However, not all of these methods support resuming from break point, which is a feature that allows you to resume an interrupted upload from where it left off.The only method that supports resuming from break point is resumable upload, which is based on multipart upload and uses a checkpoint file to record the upload progress2. The other methods do not support resuming from break point, and will either overwrite or append to the existing object if the upload is interrupted and retried.

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.

Alibaba Cloud Server Load Balancer

[ACA Cloud Computing Certification Exam Preparation Course]

Alibaba Cloud Computing Exam Question 2022

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.