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You are designing a solution for a startup company, the proposed solution is like this You suggest they use ECS instances to process requests from mobile App clients, and use SLB to distribute data traffic and ensure the load across each backend ECS instance is balanced.

Moreover to deal with volatile fluctuations in business volume (page views are much higher on the weekends), you also suggest they use Auto Scaling to dynamically increase or reduce computing resources.

The company is satisfied with the solution you proposed. However, they have one concern that when removing an idle instance from the scaling group: if Auto Scaling shuts the instance down directly, the service running on that instance will be abruptly terminated, resulting in poor user experience.

In order to eliminate your customer's concern, which of the following solutions should you recommend them?

A.

Find the ECS instance that is going to be removed from the backend server pool of the SLB instancer and automatically set the weight of this ECS instance to 0. This instance will not be assigned with new requests, and will be automatically removed from the backend server pool after existing tasks are completed.

B.

First, insert a script into the image for creating the ECS instance Second, make the script run automatically when the operating system in this ECS instances is about to shut down. This script contains the processing logic that can ensure the instance finish all the remaining tasks before shutting down.

C.

Find the ECS instance that is going to be removed from the backend server pool of the SLB instance, and manually remove this instance from the backend server pool Applications running on this ECS instance will normally return results, but this instance will not be assigned with new requests.

D.

Use the Lifecycle Hook function embedded m Auto Scaling Define a suitable timeout and a web hook to do the necessary work before the instance is removed.

You deployed a MySQL database on an Alibaba Cloud Elastic Compute Service (ECS) instance. Due to increased traffic, there are more and more O&M tasks, such as database backup and Master/Slave database synchronization, and these tasks are becoming overwhelming.

Therefore, you can use Alibaba Cloud ___________ to solve this issue.

A.

Auto Scaling

B.

ApsaraDB for RDS

C.

Object Storage Service

D.

Table Store

To meet business requirements, a user requires that the backend server of an SLB instance include a primary ECS instance and a secondary ECS instance. When the primary instance is working properly, the traffic is only forwarded to the primary ECS, when the primary instance is down, traffic is switched to the standby instance. In this case, you can create an active/standby server group on the backend of the SLB instance Which kind of listener supports this feature? (Number of correct answers: 2)

A.

HTTPS

B.

HTTP

C.

UDP

D.

TCP

Alibaba Cloud Object Storage OSS can upload object files through the console. What is the largest object file that can be uploaded?

A.

1GB

B.

5GB

C.

10GB

D.

1TB

Alibaba Cloud SLB includes components like external service requests, Listeners, Load Balancer, Backend Servers, etc. Which of the following statements is correct about Listeners?

A.

A Listener includes SLB policies and forwarding rules.

B.

A Listener is a collection of ECS instances that provide external services.

C.

A Listener refers to an SLB instance.

D.

By configuring monitoring rules, a Listener can generate monitoring metrics for SLB.

When creating cloud product instances in Alibaba Cloud, you can choose the default VPC and VSwitch. The difference between non-default VPC/VSwitch and default VPC/VSwitch is that default VPC and VSwitch can only be created by Alibaba Cloud. Which of the following statements is incorrect about default VPC?

A.

There is only one default VPC for each region

B.

Default and non-default VPCs have different constraints and operations

C.

Default VPCs are created for you by Alibaba Cloud. Any VPCs you create are non-default VPCs

D.

Default VPCs are not counted in your given VPC quota in Alibaba Cloud

When using Alibaba Cloud SLB, users can enable the Health Check function. Layer-4 SLBs (TCP protocol) determine the availability of ECS instances through _________________.

A.

Whether the 3-way handshake can be established between the backend ECS instance and the SLB.

B.

Special characters contained in the message returned from backend ECS instances.

C.

Status codes returned from backend ECS instances.

D.

Length of the message returned from backend ECS instances.

Alibaba Cloud Content Delivery Network (CDN) is a distributed network that is built and overlaid on the bearer network. It is composed of edge node server clusters distributed across different regions.

The following steps ________________ are required when a user uses Alibaba Cloud CDN. (Choose two.)

A.

Refresh cache manually

B.

Add domain name into "CDN Domain Name List"

C.

Modify domain name resolution and direct it to the given CNAME

D.

Activate CDN resource monitoring

Alibaba Cloud Content Delivery Network (CDN) is a distributed network that is built and overlaid on the bearer network Moreover it is composed of edge node server clusters distributed across different regions. It replaces the traditional data transmission mode, which is centered on Web servers. When using Alibaba Cloud CDN, a user's request wilt first reach the edge node, and then receive data from the origin site by means of back-to-source Moreover, the admin can obtain visitor's real IP on the origin site. Which of the following descriptions relate to "obtaining visitors real IP" are correct? (Number of correct answers: 2)

A.

"Visitor's real IP" is saved in "X-Forwarded-For" header in HTTP protocol. It can be directly obtained in the user-defined LOG of Apache and Nginx.

B.

"Visitor's real IP" can only be obtained by modifying the application

C.

You can one-step activate the "recording visitor's real IP" function in Alibaba Cloud CDN console to directly view the visitor's real IP in the access log.

D.

In Windows, if IIS is used: after installing "F5XForwardedFor" extension module. 'Visitor's real IP" can then be seen in the log.

Which of the following scenarios can be done using Alibaba Cloud Express Connection? (Number of correct answers: 2)

A.

Intranet communication between VPCs and Smart Access Gateway in customers different branch offices

B.

Intranet communication between a VPC and servers in an external IDC

C.

Intranet communication between two VPCs in different accounts and different CIDR Blocks

D.

Intranet communication between two VPCs under the same account in the same region