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Alibaba ACP-Cloud1 Exam - Topic 4 Question 102 Discussion

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.

Alibaba ACP-Cloud1 Exam - Topic 4 Question 102 Discussion

Actual exam question for Alibaba's ACP-Cloud1 exam
Question #: 102
Topic #: 4
[All ACP-Cloud1 Questions]

When using Alibaba Cloud SLB, users can enable the Health Check function. Layer-4 SLBs (TCP protocol) determine the availability of ECS instances through _________________.

Show Suggested Answer Hide Answer
Suggested Answer: A

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.


by Hermila at Aug 12, 2026, 08:32 AM

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Rebbeca
3 days ago
I think it's A. The handshake is crucial for TCP.
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Deeann
8 days ago
C) sounds plausible too, but A) is the way to go!
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Terry
13 days ago
I thought it was B) at first, but A) is definitely right.
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Lacresha
18 days ago
Wait, are we sure about that? I thought it was about status codes.
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Loren
24 days ago
Totally agree, A) makes the most sense.
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Carli
29 days ago
A) is the correct answer! It's all about the handshake.
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Willard
1 month ago
I’m confused about this one; I don’t recall anything about special characters or message length being relevant for health checks.
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Kris
1 month ago
I practiced a similar question, and I think it was about connection establishment, so A sounds right to me.
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Otis
1 month ago
I'm not entirely sure, but I feel like it could also be C because status codes are often used in health checks.
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Art
2 months ago
I think the answer might be A, since I remember something about the 3-way handshake being important for TCP connections.
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