Alibaba Cloud Server Load Balancer (SLB) provides services for distributing traffic among multiple ECS instances SLB can expand the application system's service capacity through traffic distribution, and improve the system's availability by eliminating SPoFs (Single Points of Failure). Which of the following statements are correct? (Number of correct answers; 2)
A. One of SLB's features is the Health Check. If some of the backend ECS instances are down, whereas other backend ECS instances can still provide services, then the system can continue to work normally.
B. When recreating an SLB instance that has an Internet IP address, a new Internet IP address will be assigned to the SLB instance.
C. Before using SLB to provide external services, make sure that you have installed and correctly configured the SLB agent on all of the backend ECS instances.
D. SLB provides a function to automatically synchronize data among backend ECS instances using rsync remote synchronization.
When creating an ECS instance in your Alibaba Cloud VPC, you must specify a VSwitch for that instance at the same time. Otherwise, you will not be able to create this ECS instance.
A. True
B. False
A popular worldwide forum stores static resources in OSS and accelerates access using CON Users find that the speed of downloading files from the forum has been greatly improved, but uploading files is slow due to the long data transmission distance, resulting in a bad access experience In order to improve the speed of uploading files for users in this forum, so that users in different regions can have a good access experience, we recommend that the forum can________.
A. Activate the PCDN service
B. Activate OSS in different regions as file storage, and synchronize data between OSS in different regions through cross-region replication
C. Enable the transmission acceleration service for O: Enable OSS
D. Enable OSS static website hosting
When using Alibaba Cloud SLB, users can enable the health check function If a backend ECS instance A is running abnormally, SLB will isolate it and forward the requests to other ECS instances, and when the backend ECS instance A is back to normal, SLB will again forward requests to it.
A. True
B. False
You need to create a new ECS instance for a 10-data test. Which of the following billing methods is most cost-effective?
A. Pay-AS-You-Go with Savings Plan
B. Preemptible
C. Subscription
D. Pay-As-You-Go
The Alibaba Cloud CDN can directly accelerate access to the files stored in OSS and reduce OSS traffic costs.
A. True
B. False
Alibaba Cloud Object Storage Service (OSS) provides multiple file uploading modes for different scenarios, which are___________. (Number of correct answers: 2)
A. Direct upload from the OSS management console no matter how large the file is
B. Uploading using the API
C. Directly copying to/from OSS using portable disks
D. Upload using the SDK
When using Alibaba Cloud SLB to forward layer 7 (HTTP) service requests. SLB will replace the IP address in the HTTP header file to forward requests.
Therefore the source IP address that can be seen on the backend ECS instance is the IP address of SLB instead of the clients real IP address.
A. True
B. False
The backend server pool of an Alibaba Cloud SLB contains multiple ECS instances, which may have different service capacities. To exploit the different service capacities of backend ECS instances, which of the following statements is correct?
A. Choose Weighted Round Robin mode to set higher weights to ECS instances with higher capacities The higher the weight of the backend ECS instance the higher chance that the instance will receive requests.
B. SLB cannot assign more requests to certain ECS instances.
C. Choose Round-Robin model and ECS instances with higher capacities will surely be assigned with more requests.
D. Choose Weighted Least-Connection mode, and ECS instances with higher capacities will surely be assigned with more requests.
Object Storage Service (OSS) supports sub accounts, and you can allocate access permissions to different buckets for each sub account.
A. True
B. False
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