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__________feature in Server Load Balancer means that it can forward the access requests from a single user to the same ECS instance within a certain period to ensure session continuity.

A.

session persistence

B.

health check

C.

Weighted Round Robin

D.

least connections scheduling

RDS for MySQL is a PaaS, which means after creating the RDS instance, the user does not need to take care of the underlying OS, runtime environment of software packages. These would be taken care of by Alibaba Cloud.

A.

TRUE

B.

FALSE

is a ready-to-use service that seamlessly integrates with Elastic Compute Service (ECS) to manage varying traffic levels without manual intervention.

A.

Server Load Balancer

B.

OSS

C.

RDS

D.

VPC

Alibaba Cloud OSS is a cloud storage service that features massive capacity, outstanding security, low cost, and high reliability. To control the access to the files stored on OSS, OSS provides multiple access permissions for each bucket. These bucket permissions are. (Choose three.)

A.

Private-read

B.

Public-read-write

C.

Public-read

D.

Private

Company В builds a music download website based on OSS and ECS, and users can download mp3 files

after registering for the website. Recently, the public network traffic to the OSS has doubled but the increase of registered users is less than 10%. After in-depth analysis, engineers find that many user download requests are raised from search engine but not the website itself. In this case, which of the following measures is thought to be able to address this issue.

A.

Migrates music files from the OSS to the data disks for ECS instances.

B.

Changes the website access mode to HTTPS.

C.

Limits access sources by configuring “Anti-leech settings” of OSS bucket attributes.

D.

Introduce SLB for extra protection.

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.

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.

B.

Data Reliability is not less than 99.99999999%. Data is backed up automatically with multiple redundant copies.

C.

Data has to be backed up by customer manually, which is time-consuming and labor-intensive.

D.

The following features are available: Multiple Authentication and Authorization mechanism, Whitelist, Anti- leech URL, and Master-Sub Account

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 main target for DDoS attack is the database.

B.

DDoS attack will try to crack the password through a large number of attempts.

C.

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.

D.

The purpose of DDoS attack is to steal confidential information.

Alibaba Cloud provides powerful security services (the same level of security services used to support Alibaba Group double 11 shopping festival). However, you have to pay first before using any of the security services.

A.

TRUE

B.

FALSE

Which of the following scenarios is applicable to use RDS read-only instances?

A.

Reduces the write pressure on the RDS primary instance.

B.

Reduces the read pressure on the RDS primary instance.

C.

Implements data backtracking for the last two days.

D.

Improves RDS storage capabilities.

You can retrieve data directly from an ECS Image and use it right away.

A.

TRUE

B.

FALSE