Huawei Cloud ELB provides traffic distribution services for multiple ECS instances. It has high availability,low cost,Safe and reliable features.
Which of the following descriptions of Huawei Cloud ELB features are correct? (Multiple choice)

• A.Provide free anti-DDoS attack capability above 20G.
• B.No need to purchase expensive load balancing equipment at one time.
• C.Support elastic expansion based on application load.
• D.Support for disaster recovery in the same city

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When a user designs a VPC public network access method on HUAWEI CLOUD, the web server must be accessible by the public network, and it must have a highly available architecture.
In order to achieve this requirement, which of the following configuration ways should be used? (Multiple choice)

• A.Put the web server on the back end of elb, and the domain name resolution IP points to elb
• B.Apply for a public IP for each web server, and the domain name resolution IP points to all public IPs
• C.Configure the CDN to point the original address to the private IP address of the web server.
• D.Configure a NAT proxy in the VPC, point the default routes of all subnets to the NAT proxy, and configure a domain name for the public network P of the NAT proxy

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The following describes the affairs in APM of HUAWEI CLOUD Application Performance Management. Which options are correct? (Multiple choice)

• A.The transaction in APM refers to the http transaction, which is the complete process from " user request > webserver> DB> webserver> user request ".
• B.The url is used as the name of the transaction in the APK, and the transaction name can also be customized. Easy to understand.
• C.When executing a transaction, multiple calls between services may be required to complete the transaction.
• D.In the e-commerce application, a product query is a transaction, and a payment is also a transaction.

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What is the default scheduling mode of Spark Job?

• A.FIFO
• B.Specify at runtime
• C.LIFO
• D.FAIR

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For services with high data consistency requirements, when performing database port switching, which of the following switching strategies should be selected?

• A.Reliability first
• B.Consistency first
• C.Feasibility first
• D.Availability first

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