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Google Professional Cloud Developer Exam - Topic 13 Question 58 Discussion

You are developing an ecommerce web application that uses App Engine standard environment and Memorystore for Redis. When a user logs into the app, the application caches the user's information (e.g., session, name, address, preferences), which is stored for quick retrieval during checkout.While testing your application in a browser, you get a 502 Bad Gateway error. You have determined that the application is not connecting to Memorystore. What is the reason for this error?
A) Your Memorystore for Redis instance was deployed without a public IP address.
B) You configured your Serverless VPC Access connector in a different region than your App Engine instance.
C) The firewall rule allowing a connection between App Engine and Memorystore was removed during an infrastructure update by the DevOps team.
D) You configured your application to use a Serverless VPC Access connector on a different subnet in a different availability zone than your App Engine instance.

Google Professional Cloud Developer Exam - Topic 13 Question 58 Discussion

Actual exam question for Google's Professional Cloud Developer exam
Question #: 58
Topic #: 13
[All Professional Cloud Developer Questions]

You are developing an ecommerce web application that uses App Engine standard environment and Memorystore for Redis. When a user logs into the app, the application caches the user's information (e.g., session, name, address, preferences), which is stored for quick retrieval during checkout.

While testing your application in a browser, you get a 502 Bad Gateway error. You have determined that the application is not connecting to Memorystore. What is the reason for this error?

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Suggested Answer: A

by Rodolfo at Oct 14, 2022, 07:03 PM

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Lucille
6 months ago
I disagree, option D seems more likely with the subnet confusion.
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Maia
6 months ago
Yeah, I had a similar issue once, it was the VPC connector.
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Eric
6 months ago
Wait, can you really have a Redis instance without a public IP? That's surprising!
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Jolene
7 months ago
I think it's definitely the firewall rule, option C makes sense.
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Micah
7 months ago
Sounds like a VPC issue, probably option B.
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Tammara
7 months ago
I've got a good feeling about this one. Based on my understanding of how App Engine and Memorystore work together, I think the answer is pretty straightforward. I'm going to go with my gut on this one.
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Erasmo
7 months ago
Ugh, this question is really making me think. I'm going to have to draw out the architecture and walk through each option to figure out what's going on. Hopefully, I can narrow it down and make an educated guess.
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Roxane
8 months ago
Alright, I think I've got this. The key is to focus on the connectivity between App Engine and Memorystore. I'm going to carefully review the options and try to eliminate the ones that don't make sense.
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Clemencia
8 months ago
Okay, let's see here. I'm pretty sure it has something to do with the Memorystore configuration, but I'm not sure which of these options is the correct answer.
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Estrella
8 months ago
Hmm, this seems like a tricky one. I'll need to carefully consider the different options and think through the potential reasons for the 502 error.
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Alecia
8 months ago
I vaguely remember something about subnets and availability zones, but I'm not confident if that's relevant here.
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Joni
8 months ago
I feel like firewall rules could definitely cause connection issues, especially if there was an update. That sounds familiar.
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Loreta
8 months ago
I think the VPC Access connector needs to be in the same region as the App Engine, but I can't recall the exact implications of that.
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Ma
8 months ago
I remember something about needing a public IP for Memorystore, but I'm not sure if that's the only issue.
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Fairy
8 months ago
Okay, let me see. I think the key is to focus on the specific requirements for an airborne diseases isolation room. Time to put my critical thinking skills to work.
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Edward
8 months ago
Hmm, I'm not sure about this one. I'll have to think it through carefully. The options seem a bit similar, so I want to make sure I understand the differences before answering.
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Carrol
8 months ago
This looks like a tricky MPLS configuration question. I'll need to carefully review the exhibit and options to determine the correct LDP-IGP Sync configuration for R2.
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