When using Alibaba Cloud SLB, users can enable the Health Check function. Layer-4 SLBs (TCP protocol) determine the availability of ECS instances through _________________.
For Layer-4 SLB using TCP, the health check determines ECS instance availability based on the successful completion of a TCP 3-way handshake. This ensures that the backend server is reachable and can accept connections, which is critical for reliable TCP-based load balancing.
Cloud computing adopts a common model in Distributed Systems. It distributes a computing task to a resource pool (comprised of a large number of computers). Elastic utilization of the resource pool allows applications to obtain computing capacity, storage space, and message services according to needs. Which of the following statements are correct about cloud computing? (Choose four.)
Cloud computing is characterized by large-scale infrastructure, high availability, on-demand service provisioning, and versatility in handling diverse applications and workloads. It supports both multi-tenant and single-tenant configurations, and although containerization is popular, cloud computing is not limited to container-based architectures.
Auto Scaling often works in conjunction with SLB, where scaling groups and SLB must be in the same region.
When using Auto Scaling with Server Load Balancer (SLB), both the scaling group and the SLB instance must reside in the same region. This is because region-specific configurations enable low-latency connections and proper integration between the resources, ensuring the scaling group can register with the SLB instance effectively.
You need to create a new ECS instance for a 10-data test. Which of the following billing methods is most cost-effective?
According to the Alibaba Cloud ECS documentation1, the Pay-As-You-Go billing method is flexible and suitable for short-term or uncertain workloads. However, it is also the most expensive option compared to other billing methods. To reduce the cost of Pay-As-You-Go instances, you can purchase a Savings Plan, which is a discount plan that offers lower prices for a fixed amount of hourly usage. A Savings Plan can be applied to any Pay-As-You-Go instance in the same region, regardless of the instance type, operating system, or zone. Therefore, option A is the most cost-effective billing method for a 10-day test, as it allows you to enjoy the flexibility of Pay-As-You-Go and the savings of a fixed commitment. Reference: Billing methods and Savings Plan.
A customer uses Alibaba Cloud Auto Scaling service and creates a scaling group. They set the "Minimum number of instances" to 6 and the "Maximum number of instances" to 8. After correctly configuring scaling settings, the customer adds a scaling rule ''Adjust to 10 ECS instances'' and creates a scheduled task based on this rule. Then, the customer checks the scaling group and sees it already contains 6 valid ECS instances. They then enable this scaling group immediately. How many ECS instances will be in the scaling group when the scheduled task is activated once?
Even though the scaling rule is set to 'Adjust to 10 ECS instances,' the maximum instance limit set for the scaling group is 8. Thus, when the scheduled task is triggered, Auto Scaling will increase the number of instances up to the maximum allowed, which is 8. Therefore, the scaling group will contain 8 instances, not 10, as it adheres to the defined maximum limit.
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