Which one of the following descriptions about high availability and disaster tolerance of user business systems is correct?

• A.Disaster tolerance mainly deals with the failure of a single component, which causes the load to switch between servers in the cluster.
• B.The scope of high availability is the LAN standard, and the scope of disaster recovery is the WAN standard.
• C.High availability mainly responds to large-scale failures, resulting in load switching between remote data centers.
• D.High availability is a mechanism to ensure business continuity in a cloud environment, and disaster tolerance is a mechanism to ensure business continuity among multiple cloud environments.

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An enterprise user uses a dedicated line to connect the VPC on Huawei Cloud and the IDC network under the cloud. An FTP Server is deployed on the ECS in the VPC. Now the IDC under the cloud needs to access the FTP Server, but the service must pass the specified IP (It is not provided in the 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16 network segment). How does the enterprise administrator need to configure to meet this requirement?

• A.Use the NAT gateway service to convert the ECS IP with FTP Server deployed to the specified IP.
• B.Use the specified IP to configure the sub-interface in the ECS operating system, add a custom routing entry in the VPC, configure the destination address to the specified IP, configure the next hop to the ECS, and turn off the "source/destination check" of the corresponding ECS switch.
• C.Use the specified IP to create EC and deploy FTP-Server in ECS
• D.The demand cannot be met through the existing capabilities of the public cloud.

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In order to collect and analyze a large amount of user data generated by shopping websites, an e-commerce company plans to deploy a mongoDB database on the cloud.
After testing, it is found that the database requires 500w PPS packet sending and receiving capabilities and 20Gbps intranet bandwidth. Among the following ECS elastic cloud servers, which type is most suitable to deploy this database application?

• A.C3 general computing enhanced.
• B.H3 high-performance computing
• C.M3 memory optimized.
• D.I3 super high 10 type

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What levels of high availability does Huawei Cloud RDS cloud database support? (Multiple choice)

• A.VPC level
• B.Region level
• C.AZ level
• D.Server level

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A customer uses the ECS service of HUAWEI CLOUD. In order to share files on the ECS instance with other ECS instances more conveniently, which type of storage service is recommended for tenants?

• A.Cloud hard disk EVS
• B.Exclusive distributed storage service DSS
• C.Resilient File Service SFS
• D.Storage disaster recovery service SDRS

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