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Alibaba ACP-Cloud1 Exam - Topic 8 Question 88 Discussion

Actual exam question for Alibaba's ACP-Cloud1 exam
Question #: 88
Topic #: 8
[All ACP-Cloud1 Questions]

To meet business requirements, a user requires that the backend server of an SLB instance include a primary ECS instance and a secondary ECS instance. When the primary instance is working properly, the traffic is only forwarded to the primary ECS, when the primary instance is down, traffic is switched to the standby instance. In this case, you can create an active/standby server group on the backend of the SLB instance Which kind of listener supports this feature? (Number of correct answers: 2)

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Suggested Answer: A, D

Active/standby server groups are a feature of Server Load Balancer (SLB) that allows you to configure a primary ECS instance and a secondary ECS instance for the backend of an SLB instance1. When the primary instance is working properly, the traffic is only forwarded to the primary ECS. When the primary instance is down, traffic is switched to the standby instance1. This feature is supported by TCP and HTTPS listeners, but not by HTTP and UDP listeners1. TCP and HTTPS listeners support session persistence, which ensures that requests from the same client are always forwarded to the same backend server2. HTTP and UDP listeners do not support session persistence, and they use round-robin or weighted round-robin algorithms to distribute traffic among the backend servers2. Reference: 1: Create an active/standby server group 2: [Configure a listener]


by Isadora at Oct 19, 2025, 02:33 AM

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Lisbeth
1 day ago
I’m leaning towards A and D as well. They support failover.
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Lanie
6 days ago
I feel like B is a safe choice too. HTTP is common.
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Ligia
12 days ago
Definitely A and D. HTTPS and TCP are reliable.
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Martin
17 days ago
Yeah, active/standby setups are usually for TCP/HTTPS!
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Solange
22 days ago
Wait, can UDP really be used for this? Seems odd.
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Kattie
27 days ago
I believe HTTP could work too, but not as reliable.
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Lakeesha
1 month ago
Definitely agree with HTTPS, but not so sure about TCP.
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Elroy
1 month ago
I think both HTTPS and TCP are the right answers.
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Gertude
1 month ago
TCP and HTTP, easy peasy. Though I do enjoy a good UDP joke now and then.
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Carey
2 months ago
I'm going with TCP and UDP, just to be safe.
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Margurite
2 months ago
Definitely TCP, it's the only one that supports active/standby server groups.
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Dolores
2 months ago
TCP and HTTP are the way to go for this use case.
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Lashawn
2 months ago
I'm a bit confused on this one. I'm not sure which listener types would specifically support the active/standby setup they're describing. I'll need to review the differences between the listener options more carefully to determine the correct answer.
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Avery
2 months ago
I think it's either A or B. They handle traffic well.
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Shasta
3 months ago
TCP and HTTP? What is this, a trick question?
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Hassie
3 months ago
I'm pretty confident the answer is TCP and HTTP. Those listener types would allow for the traffic to be routed to the primary instance, and then switched over to the secondary if needed. The other options like HTTPS and UDP don't seem like they'd have the same failover capabilities.
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Maryrose
3 months ago
Okay, let's see. The question mentions HTTP, HTTPS, UDP, and TCP as the possible listener types. I'm guessing either HTTP or TCP would be the ones that support the failover functionality they're looking for.
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Catherin
4 months ago
Hmm, this seems like a tricky one. I'm not totally sure which listener types would support the active/standby setup. I'll need to think through the different options and their capabilities.
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Markus
4 months ago
I think the key here is understanding the requirements for the active/standby server group on the SLB instance. The question mentions that the traffic should only go to the primary instance when it's working, and switch to the secondary when the primary is down. So I'll need to consider which listener types support this failover functionality.
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Nu
2 months ago
Yeah, I agree. HTTP might not be reliable enough for this.
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Dorethea
3 months ago
I believe both HTTPS and TCP listeners can handle that failover.
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Cyril
4 months ago
I definitely remember that HTTP and HTTPS are commonly used for web traffic, so I would lean towards those being the correct answers for the listener types.
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Corrie
4 months ago
I'm a bit confused about the differences between TCP and UDP in this context. I feel like both might be relevant, but I can't recall if UDP supports active/standby.
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Van
4 months ago
I practiced a similar question last week, and I think TCP is also a valid option for this setup. UDP seems less likely since it doesn't maintain a connection.
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Brandee
5 months ago
I remember studying about SLB instances and how they handle traffic. I think both HTTP and HTTPS listeners can support active/standby configurations, but I'm not entirely sure.
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