When using Alibaba Cloud SLB, users can enable the Health Check function. Layer-4 SLBs (TCP protocol) determine the availability of ECS instances through _________________.
A.
Whether the 3-way handshake can be established between the backend ECS instance and the SLB.
B.
Special characters contained in the message returned from backend ECS instances.
C.
Status codes returned from backend ECS instances.
D.
Length of the message returned from backend ECS instances.
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.
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