Question 1

You are parsing a log file that contains three columns: a timestamp, an account number (a string), and a transaction amount (a number). You want to calculate the sum of all transaction amounts for each unique account number efficiently. Which data structure should you use?

Accepted Answer

A hash table is efficient for this task because it allows for quick lookups and updates of transaction sums associated with each unique account number.

Question 2

Your code is running on Cloud Functions in project A. It is supposed to write an object in a Cloud Storage bucket owned by project B. However, the write call is failing with the error "403 Forbidden". What should you do to correct the problem?

Accepted Answer

B

Question 3

You need to copy directory local-scripts and all of its contents from your local workstation to a Compute Engine virtual machine instance. Which command should you use?

Accepted Answer

The `gcloud compute scp` command is used to securely copy files and directories to and from Google Compute Engine instances. The `--recurse` flag allows copying directories and their contents.

Question 4

You have an application deployed in production. When a new version is deployed, some issues don't arise until the application receives traffic from users in production. You want to reduce both the impact and the number of users affected. Which deployment strategy should you use?

Accepted Answer

The answer of You have an application deployed in production....

Question 5

You are building an API that will be used by Android and iOS apps The API must: • Support HTTPs
• Minimize bandwidth cost
• Integrate easily with mobile apps Which API architecture should you use?

Accepted Answer

The answer of You are building an API that will...

Question 6

You plan to make a simple HTML application available on the internet. This site keeps information about FAQs for your application. The application is static and contains images, HTML, CSS, and Javascript. You want to make this application available on the internet with as few steps as possible. What should you do?

Accepted Answer

Uploading your static application to Cloud Storage is the simplest and most straightforward way to host static content like HTML, CSS, JavaScript, and images on the internet.

Question 7

Your company has a BigQuery dataset named "Master" that keeps information about employee travel and expenses. This information is organized by employee department. That means employees should only be able to view information for their department. You want to apply a security framework to enforce this requirement with the minimum number of steps. What should you do?

Accepted Answer

The answer of Your company has a BigQuery dataset named...

Question 8

You have two tables in an ANSI-SQL compliant database with identical columns that you need to quickly combine into a single table, removing duplicate rows from the result set. What should you do?

Accepted Answer

The UNION operator combines the results of two queries and removes duplicate rows, which is required in this scenario.

Question 9

Your teammate has asked you to review the code below. Its purpose is to efficiently add a large number of small rows to a BigQuery table.  Which improvement should you suggest your teammate make?

Accepted Answer

The answer of Your teammate has asked you to review...

Question 10

You want to upload files from an on-premises virtual machine to Google Cloud Storage as part of a data migration. These files will be consumed by Cloud DataProc Hadoop cluster in a GCP environment. Which command should you use?

Accepted Answer

gsutil is the command-line tool for interacting with Cloud Storage. The cp command is used to copy objects to and from Cloud Storage.

Question 11

You are developing an HTTP API hosted on a Compute Engine virtual machine instance that needs to be invoked by multiple clients within the same Virtual Private Cloud (VPC). You want clients to be able to get the IP address of the service. What should you do?

Accepted Answer

The answer of You are developing an HTTP API hosted...

Question 12

You are building a new API. You want to minimize the cost of storing and reduce the latency of serving images. Which architecture should you use?

Accepted Answer

The answer of You are building a new API. You...

Question 13

Your service adds text to images that it reads from Cloud Storage. During busy times of the year, requests to Cloud Storage fail with an HTTP 429 "Too Many Requests" status code. How should you handle this error?

Accepted Answer

Using a truncated exponential backoff strategy is a common method to handle HTTP 429 errors, as it allows the system to retry requests after increasing intervals, reducing the load on the server and increasing the chances of success.

Question 14

You are writing a single-page web application with a user-interface that communicates with a third-party API for content using XMLHttpRequest. The data displayed on the UI by the API results is less critical than other data displayed on the same web page, so it is acceptable for some requests to not have the API data displayed in the UI. However, calls made to the API should not delay rendering of other parts of the user interface. You want your application to perform well when the API response is an error or a timeout. What should you do?

Accepted Answer

The answer of You are writing a single-page web application...

Question 15

You are load testing your server application. During the first 30 seconds, you observe that a previously inactive Cloud Storage bucket is now servicing 2000 write requests per second and 7500 read requests per second. Your application is now receiving intermittent 5xx and 429 HTTP responses from the Cloud Storage JSON API as the demand escalates. You want to decrease the failed responses from the Cloud Storage API. What should you do?

Accepted Answer

Distributing the uploads across multiple storage buckets can help balance the load and reduce the likelihood of hitting rate limits or experiencing throttling, which can lead to 5xx and 429 errors.

Question 16

You are deploying your application to a Compute Engine virtual machine instance. Your application is configured to write its log files to disk. You want to view the logs in Stackdriver Logging without changing the application code. What should you do?

Accepted Answer

Install the Stackdriver Logging Agent and configure it to send the application logs. This allows you to collect and send logs to Stackdriver Logging without modifying the application code.

Question 17

You are deploying your application to a Compute Engine virtual machine instance with the Stackdriver Monitoring Agent installed. Your application is a unix process on the instance. You want to be alerted if the unix process has not run for at least 5 minutes. You are not able to change the application to generate metrics or logs. Which alert condition should you configure?

Accepted Answer

The answer of You are deploying your application to a...

Question 18

You have deployed an HTTP(s) Load Balancer with the gcloud commands shown below.  Health checks to port 80 on the Compute Engine virtual machine instance are failing and no traffic is sent to your instances. You want to resolve the problem. Which commands should you run?

Accepted Answer

The answer of You have deployed an HTTP(s) Load Balancer...

Question 19

You want to notify on-call engineers about a service degradation in production while minimizing development time. What should you do?

Accepted Answer

The answer of You want to notify on-call engineers about...

Question 20

Your application takes an input from a user and publishes it to the user's contacts. This input is stored in a table in Cloud Spanner. Your application is more sensitive to latency and less sensitive to consistency. How should you perform reads from Cloud Spanner for this application?

Accepted Answer

The answer of Your application takes an input from a...

Exam 13: Professional Cloud Developer

You are parsing a log file that contains three columns: a timestamp, an account number (a string) , and a transaction amount (a number) . You want to calculate the sum of all transaction amounts for each unique account number efficiently. Which data structure should you use?