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Alibaba ACA-Operator Exam - Topic 6 Question 91 Discussion

In Alibaba Cloud, a developer finds that the ECS instance he created does nothave public IP assigned. The API method used was ''CreateInstance''. Whichof the following is the most likely reason?
A) The developer did not call AllocatePublicIpAdress (an additional API call), which is needed to assign a public IP
B) The CreateSecurityGroup API call was not made
C) The CreateDisk API call was not made
D) The ECS was not restarted after being created

Alibaba ACA-Operator Exam - Topic 6 Question 91 Discussion

Actual exam question for Alibaba's ACA-Operator exam
Question #: 91
Topic #: 6
[All ACA-Operator Questions]

In Alibaba Cloud, a developer finds that the ECS instance he created does not

have public IP assigned. The API method used was ''CreateInstance''. Which

of the following is the most likely reason?

Show Suggested Answer Hide Answer
Suggested Answer: A

https://www.alibabacloud.com/help/doc-detail/25544.htm


by Jacquelyne at Nov 22, 2025, 09:55 PM

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Micaela
2 months ago
A is the right choice. Clear API requirement!
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Dyan
2 months ago
D is unlikely. Restarting wouldn’t assign IP.
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Veronica
2 months ago
Definitely A. I missed that once too.
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Val
2 months ago
B seems off. Security group doesn't affect IP.
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Alfred
2 months ago
Agreed, A makes the most sense.
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Janae
3 months ago
Nah, D isn't it, restarting won't assign a public IP.
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Sophia
3 months ago
Wait, you have to call another API just for the IP? That's surprising!
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Levi
3 months ago
B seems more likely to me, security groups can affect access.
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Latia
3 months ago
I thought it was automatic, but guess not!
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Han
4 months ago
Definitely A, you need to allocate a public IP separately.
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Norah
4 months ago
A) is the way to go. The developer needs to call that extra API to get the public IP. It's not magic, folks!
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Vinnie
4 months ago
Haha, C) Creating a disk? That's like trying to fill up a car with water instead of gas. Totally irrelevant!
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Juliann
4 months ago
B) Creating a security group? What does that have to do with getting a public IP? This question is making my head hurt.
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Claribel
4 months ago
D) Restarting the ECS? Really? That's not how it works. This is Alibaba Cloud, not your grandma's Windows machine.
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Aliza
5 months ago
A) Seems like the most obvious answer. You can't just create an instance and expect it to have a public IP without explicitly requesting one.
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Marnie
5 months ago
I thought the ECS instance would automatically get a public IP, but now I’m confused. Could it really be just about the AllocatePublicIpAddress call?
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Bette
5 months ago
I practiced a similar question where the public IP was mentioned, and it was definitely about allocating it separately. A seems most likely here.
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Lucina
5 months ago
I'm not entirely sure, but I feel like the security group setup could also affect network access. Maybe B is relevant?
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Felton
5 months ago
I feel pretty confident that the answer is A. The developer needs to make that extra API call to actually assign the public IP, even after creating the instance.
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Nichelle
5 months ago
Okay, let me think this through. The question is specifically about the public IP not being assigned, so I think the key is that additional API call needed to allocate the public IP. I'll go with A.
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Glendora
6 months ago
I remember reading that you need to explicitly allocate a public IP after creating an instance. So, I think A might be the right answer.
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Timothy
6 months ago
Hmm, I'm not sure. The question mentions the CreateInstance API, so I don't think the CreateDisk call is relevant. I'd guess it's either A or B.
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Lyla
6 months ago
I think it's A. Public IP needs an extra call.
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Rosendo
6 months ago
I'm a bit confused on this one. Is it possible that the developer didn't create a security group properly? Option B seems like it could be a possibility.
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Elvera
7 months ago
I think the most likely reason is A. The developer probably forgot to call the AllocatePublicIpAdress API to assign a public IP.
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Darrin
29 days ago
Right? It's an easy mistake to make.
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Carey
1 month ago
I think people overlook that step often.
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Sophia
1 month ago
Definitely! Without that, no public IP.
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Krystina
2 months ago
I agree, it has to be A. That API call is crucial.
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Julene
6 months ago
A simple oversight can lead to big issues!
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