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Alibaba ACA-Developer Exam - Topic 1 Question 42 Discussion

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)
B) The built-in firewall on ECS-A has rules that prohibit external access to the MySQL service port. and C) No Internet IP address is configured for ECS-A. and D) The bind-address parameter set in the my.ini configuration file of the MySQL service is commented out.
A) The security group for ECS-A does not have the default MySQL service port open.

Alibaba ACA-Developer Exam - Topic 1 Question 42 Discussion

Actual exam question for Alibaba's ACA-Developer exam
Question #: 42
Topic #: 1
[All ACA-Developer Questions]

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)

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Suggested Answer: B, C, D

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

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Dick
10 months ago
Agreed, the security group is usually the culprit in these cases.
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Levi
10 months ago
No Internet IP address isn't the issue here, it's all about VPC.
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Dorathy
10 months ago
Wait, does the bind-address in my.ini really affect this?
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Rebbecca
11 months ago
I think the firewall rules on ECS-A could be blocking it too.
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Craig
11 months ago
Definitely check the security group settings for ECS-A.
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Lura
11 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
11 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
11 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
11 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
11 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
11 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
11 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
11 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
11 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
1 year 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
1 year ago
A: Good point. Those could be causing the connection issue.
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Sherly
1 year 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
1 year 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
1 year 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
1 year 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
1 year 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
1 year ago
C: No Internet IP address is configured for ECS-A.
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Theron
1 year 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
1 year ago
A: The security group for ECS-A does not have the default MySQL service port open.
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Merilyn
1 year 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
1 year ago
C: No Internet IP address is configured for ECS-A.
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Joseph
1 year ago
C: Maybe they should check the firewall rules on ECS-A as well.
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Horace
1 year ago
B: Yeah, that could definitely be causing the issue.
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Brittney
1 year 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
1 year ago
A: The security group for ECS-A does not have the default MySQL service port open.
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Dalene
1 year ago
A: The security group for ECS-A does not have the default MySQL service port open.
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Winfred
1 year 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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Derick
1 year ago
I agree, always double check those settings to make sure the connection can go through.
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Candra
1 year ago
Yeah, you're right. The security group and firewall rules are usually the culprits in these cases.
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Thad
1 year ago
I'm not sure about C, but I think A and D make sense. The security group and configuration file settings are important for connectivity.
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Wilburn
1 year ago
I agree with Emeline. The security group and the bind-address parameter could be causing the issue.
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Emeline
1 year ago
I think A and D could be the reasons.
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Marshall
1 year ago
But what about the bind-address parameter in the my.ini file? Could that also be causing the problem?
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Cristy
1 year ago
I agree with Cherelle, the MySQL service port might not be open in the security group.
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Cherelle
1 year ago
I think the issue might be with the security group on ECS-A.
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