Alibaba ACA-Developer Exam - Topic 1 Question 42 Discussion

Actual exam question for Alibaba's ACA-Developer exam

Question #: 42
Topic #: 1

A developer creates a MySQL database service on a Linux ECS instance (ECS-A), and wants to access this database service from another instance (ECS-B) in the same VPC using the private IP address bound to the ECS instance, however, the connection can't be established. What could cause this? (Number of correct answers: 2)

AThe security group for ECS-A does not have the default MySQL service port open.

BThe built-in firewall on ECS-A has rules that prohibit external access to the MySQL service port.

CNo Internet IP address is configured for ECS-A.

DThe bind-address parameter set in the my.ini configuration file of the MySQL service is commented out.

Show Suggested Answer

Suggested Answer: B, C, D

by Cory at May 30, 2023, 11:22 AM

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Dick

5 months ago

Agreed, the security group is usually the culprit in these cases.

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Levi

6 months ago

No Internet IP address isn't the issue here, it's all about VPC.

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Dorathy

6 months ago

Wait, does the bind-address in my.ini really affect this?

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Rebbecca

6 months ago

I think the firewall rules on ECS-A could be blocking it too.

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Craig

6 months ago

Definitely check the security group settings for ECS-A.

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Lura

6 months ago

I vaguely recall something about the bind-address in MySQL configurations. If it's commented out, that could definitely cause issues like in option D.

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Xochitl

6 months ago

I don't think option C is relevant here since they are in the same VPC, right? But I could be wrong.

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Evette

6 months ago

I'm not entirely sure, but I feel like the firewall settings on ECS-A might be blocking the connection. That makes me think of option B.

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Estrella

6 months ago

I remember we discussed security groups in class, so I think option A could be a reason for the connection issue.

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Justa

7 months ago

Okay, let me see here. The difference between the latest and earliest event times... that must be the float, right? I'm pretty sure that's the correct answer.

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Donette

7 months ago

I remember discussing phishing emails, but I'm not entirely sure if the threat actor is the sender or the content itself.

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James

7 months ago

Hmm, I'm a bit unsure about this one. I'll have to think it through carefully. Is it talking about the range where costs don't change, or something else?

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Gennie

7 months ago

This is a tricky one. I'm not sure if SSL certificates are the right solution, since the issue seems to be more about file access than encryption. I'd lean towards either option B or C.

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Tonette

7 months ago

I have a vague recollection that violations can prevent access regardless of the processing order, but that could be just me misremembering.

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Natalie

11 months ago

Maybe the developer should try using a tin can and a string. It's old-school, but you know what they say - if it ain't broke, don't fix it. Or in this case, if it's not working, go back to the basics!

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Merrilee

11 months ago

A: Good point. Those could be causing the connection issue.

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Sherly

11 months ago

B: Yeah, and they should also make sure the bind-address parameter in the my.ini configuration file is not commented out.

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Nina

11 months ago

A: Maybe the developer should check if the security group for ECS-A has the default MySQL service port open.

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Malinda

12 months ago

Ah, the joys of troubleshooting network issues. I bet the developer is cursing the day they decided to become a programmer instead of a professional cat herder. Hang in there, buddy!

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Jaime

12 months ago

No Internet IP address? That's a head-scratcher. I guess the developer was trying to be all fancy with the private IP, but forgot that sometimes you just need that good old public IP to make things work. Gotta love the cloud, am I right?

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Jules

10 months ago

D: The bind-address parameter set in the my.ini configuration file of the MySQL service is commented out.

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Corinne

10 months ago

C: No Internet IP address is configured for ECS-A.

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Theron

10 months ago

B: The built-in firewall on ECS-A has rules that prohibit external access to the MySQL service port.

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Lynelle

10 months ago

A: The security group for ECS-A does not have the default MySQL service port open.

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Merilyn

10 months ago

D: The bind-address parameter set in the my.ini configuration file of the MySQL service is commented out.

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Tish

10 months ago

C: No Internet IP address is configured for ECS-A.

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Joseph

11 months ago

C: Maybe they should check the firewall rules on ECS-A as well.

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Horace

11 months ago

B: Yeah, that could definitely be causing the issue.

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Brittney

11 months ago

B: The built-in firewall on ECS-A has rules that prohibit external access to the MySQL service port.

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Luther

11 months ago

A: The security group for ECS-A does not have the default MySQL service port open.

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Dalene

11 months ago

A: The security group for ECS-A does not have the default MySQL service port open.

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Winfred

12 months ago

The bind-address parameter in the my.ini file? Wow, that's a sneaky one. I bet the developer forgot to check the configuration, or maybe they're just not a MySQL wizard. Either way, it's gonna take some digging to figure this one out.

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Janna

1 year ago

Hmm, I think it's definitely the security group and the firewall rules. Gotta make sure those ports are open, no matter how obvious it seems. Rookie mistake, but we've all been there, right?

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