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Question # 4

Many websites have suffered DDoS attacks of different volumes. Therefore, accurate understanding of DDoS attacks is critical to website security protection. Which of the following statements about DDoS attacks is the MOST accurate?

A.

The purpose of a DDoS attack is to steal confidential information.

B.

The main purpose of a DDoS attack is to prevent the target server from providing normal services. Currently, the DDoS attack is one of the strongest and most indefensible website attacks.

C.

A DDoS attacks crack the server's logon password by means of a massive number of attempts.

D.

DDoS attacks primarily target databases.

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Question # 5

A popular worldwide forum stores static resources in OSS and accelerates access using CON Users find that the speed of downloading files from the forum has been greatly improved, but uploading files is slow due to the long data transmission distance, resulting in a bad access experience In order to improve the speed of uploading files for users in this forum, so that users in different regions can have a good access experience, we recommend that the forum can________.

A.

Activate the PCDN service

B.

Activate OSS in different regions as file storage, and synchronize data between OSS in different regions through cross-region replication

C.

Enable the transmission acceleration service for O: Enable OSS

D.

Enable OSS static website hosting

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Question # 6

Company A constructed a sales management platform using three Elastic Compute Service (ECS) instances. One of the instances runs MySQL, and is used as the database server. The other two instances are used as Web servers After some time, the number of employees in Company A dramatically increases, leading to higher sales volumes At the same time, the platform response speed is gradually decreasing too.

According to the report from CloudMonitor, the average CPU utilization rate of the two Web servers exceeds 70%, and database load

reaches 75% Company A can select Alibaba Cloud_________ services.to cope with the issue and optimize the performance. (Number of correct answers: 2)

A.

Import database data into Object Storage Service (OSS) to share the storage pressure on the platform

B.

Incorporate Server Load Balancer (SLB) and add additional ECS instances to relieve the load on existing ECS instances

C.

Use Content Delivery Network (CDN) to enhance content loading speed

D.

Replace the self-built MySQL database with ApsaraDB for RDS to obtain better database performance, and utilize RDS read-only instances to handle read-only requests

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Question # 7

The Alibaba Cloud CDN can directly accelerate access to the files stored in OSS and reduce OSS traffic costs.

A.

True

B.

False

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Question # 8

Alibaba Cloud Server Load Balancer (SLB) provides services for distributing traffic among multiple ECS instances SLB can expand the application system's service capacity through traffic distribution, and improve the system's availability by eliminating SPoFs (Single Points of Failure). Which of the following statements are correct? (Number of correct answers; 2)

A.

One of SLB's features is the Health Check. If some of the backend ECS instances are down, whereas other backend ECS instances can still provide services, then the system can continue to work normally.

B.

When recreating an SLB instance that has an Internet IP address, a new Internet IP address will be assigned to the SLB instance.

C.

Before using SLB to provide external services, make sure that you have installed and correctly configured the SLB agent on all of the backend ECS instances.

D.

SLB provides a function to automatically synchronize data among backend ECS instances using rsync remote synchronization.

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Question # 9

Many of Alibaba Cloud services provide highly reliable data storage capacity. For example, Object Storage Service (OSS) promises that its data reliability is no less than 99 99999999%. This high data reliability is solely achieved by RAID 0+1 redundancy technology.

A.

True

B.

False

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Question # 10

Alibaba Cloud SLB can distribute user requests to backend ECS instances. These ECS instances must have the same specification (CPU, Memory)

A.

True

B.

False

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