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A video company uses SLB to distribute user requests to 20 ECS instances with the same configuration to response these requests. As the Spring Festival approaches, service traffic would double during holidays (based on past experience).

Thus, you use Auto Scaling to elastically adjust computing resources. Since the services is online for many years, you have historic records that can help predict the upcoming service traffic and choose the scaling mode freely.

In this scenario, which of the following options are feasible and with minimum operation efforts? (Number of correct answers: 2)

A. Cloud monitor and event-triggered task: Dynamically adds ECS instances during resource shortage and reduces ECS instances during idle hours by monitoring the CPU utilization rate and workload

B. Scheduled task: Increases the number of ECS instances to 40 on the first day of the holidays and reduce the number to 20 after the holidays.

C. Manual mode: Set the minimum number of instances to 40 on the first day of the holidays and change the number to 20 after the holidays.

D. Healthy check mode: Ensures that all the current ECS instances in scaling groups are working correctly to meet user access requests.

A company launched its online service just a year ago. It uses five ECS instances and does not have a full-time system administrator Over the last six months, the company's system has encountered various security problems Several high-risk vulnerabilities were exploited by hackers, leading to leakage of the company's confidential data. Which of the following Alibaba Cloud products can be used to quickly resolve this problem?

A. Managed Security Service

B. Cloud Firewall

C. Anti-DDoS Pro Service

D. Security Center

OSS supports multi-part uploading for large files, namely dividing a large file into multiple parts and uploading them in order. This function is suitable for scenarios such as uploading large files or uploading files with poor connectivity.

After completing all the multi-part uploading tasks, if you forget to invoke the "Complete Multipart Upload" interface, there will be fragment files left in OSS, occupying bucket storage space-To facilitate deleting those files, OSS provides the________function.

A. OpenAPI batch deletion

B. Online batch deletion

C. Bucket clearing

D. Fragment management

The difference between public and private Server Load Balancers (SLBs) is that private SLBs connect to their backend ECS instances using the private network (Intranet) while public SLBs connect to their backend ECS instances using the public network (Internet).

A. True

B. False

When you create an Alibaba Cloud VPC. a VRouter and a route table will be created automatically. Which of the following statements is NOT correct about the route table?

A. Each VRouter may have multiple route tables.

B. When a VPC is deleted, the corresponding route table is also deleted.

C. This route table cannot be deleted

D. The routing entries of the route table can not be modified manually.