Alibaba Cloud Certified Associate (ACA) Practice Test 2025 - Free ACA Practice Questions and Study Guide

The primary advantage of using an Elastic IP (EIP) within Alibaba Cloud is that it provides a fixed public IP that can be associated with instances. This feature is critical for scenarios where a stable and consistent IP address is necessary for communication with external services or users. Unlike dynamic IP addresses, which can change when an instance is restarted or scaled, an EIP remains static, allowing for persistent connections and easier management of DNS records, reducing the complexity of network configurations.

Additionally, the ability to reassign the EIP between different instances adds flexibility to resource management, facilitating failover solutions or load balancing strategies without the need to change external configurations. This is especially beneficial for applications that require high availability and consistent backend configurations.

Other options, while they might have their own importance in different contexts, do not highlight the primary function of an EIP as effectively as this choice does.