When using Alibaba Cloud SLB, a user configures the Health Check as follows: response timeout value set to 5 seconds, Health Check interval set to 2 seconds, unhealthy threshold value set to 3, and healthy threshold value set to 3. That is to say, to confirm a backend ECS instance is healthy, three successive normal responses are required.
If the current status of a backend ECS instance is unhealthy, and you finish the repair work immediately, it will take at least _______________ for SLB Health Check to confirm this instance is healthy again.
To confirm a previously unhealthy instance is now healthy, Alibaba Cloud SLB requires three consecutive successful health checks. With a health check interval of 2 seconds and a response timeout of 5 seconds, each check cycle takes up to 5 seconds. Therefore, three successive health checks would take a minimum of 53=155 \times 3 = 1553=15 seconds in total. However, because the health checks are conducted at 2-second intervals, there's overlap, reducing the actual time to at least 11 seconds for the SLB to mark the instance as healthy.
Company G developed a shopping App. The system is built using Alibaba Cloud products, including ECS instances and OSS in the North China 1 region, where static web pages and images are stored on OSS.
After the App went online, the access speed in mainland China was acceptable. Recently, the company decided to expand to the U.S. market and requires acceptable access speeds for U.S. users.
To address this requirement, Company G should select Alibaba Cloud _______________ service.
To improve access speeds for U.S. users, Company G can enable OSS with CDN in the West US (Silicon Valley) region. By deploying CDN in a region close to the target audience, the static content stored in OSS can be cached and delivered more efficiently. CDN caches the content at edge locations, reducing latency for users in different geographical areas. This approach is ideal for expanding the application to international markets while maintaining fast access times.
All RDS for MySQL backups are full backups.
RDS for MySQL supports both full backups and incremental backups. A full backup is a complete backup of all data in a database. An incremental backup is a backup of only the data that has changed since the last backup. Incremental backups can reduce the backup time and storage space. You can configure the backup cycle and retention period for both types of backups in the RDS console or by using the API.
Which of the following statements about an OSS bucket is NOT correct?
In Alibaba Cloud Object Storage Service (OSS), once a bucket is created, its name cannot be changed. This rule aligns with OSS's design to ensure global uniqueness and consistency in bucket naming across regions. Users can create multiple buckets, and each bucket can store an unlimited number of objects, provided the bucket name remains unique and immutable after creation.
An enterprise uses a public cloud service to lease several virtual machines and places these virtual machines in an isolated virtual network. They have full control over their virtual network, including choosing their IP address range, specifying the CIDR block, configuring the routing table, and gateway, etc.
In Alibaba Cloud, the _____________ can work as described above.
In Alibaba Cloud, a Virtual Private Cloud (VPC) provides isolated virtual networking environments where users can configure their own IP address ranges, CIDR blocks, routing tables, gateways, and other network elements. This functionality is critical for users who require an isolated, customizable network environment for their virtual machines in the public cloud. SDN (Software-Defined Networking) and NFV (Network Functions Virtualization) are underlying technologies, while VPN offers secure connectivity but not full virtual network management.
