You work for an organization that manages an ecommerce site. Your application is deployed behind an external Application Load Balancer. You need to test a new product recommendation algorithm. You plan to use A/B testing to determine the new algorithm's effect on sales in a randomized way. How should you test this feature?

• A. Split traffic between versions using weights.
• B. Enable the new recommendation feature flag on a single instance.
• C. Use HTTP header-based routing.
• D. Mirror traffic to the new version of your application.

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?

• A. Grant the [email protected] service account the roles/ storage.objectCreator role for the Cloud Storage bucket.
• B. Enable the Cloud Storage API in project B.
• C. Grant your user account the roles/iam.serviceAccountUser role for the service-PROJECTA@gcf- admin-robot.iam.gserviceaccount.com service account.
• D. Grant your user account the roles/storage.objectCreator role for the Cloud Storage bucket.

Case Study 1 - HipLocal
Company Overview
HipLocal is a community application designed to facilitate communication between people in close proximity. It is used for event planning and organizing sporting events, and for businesses to connect with their local communities. HipLocal launched recently in a few neighborhoods in Dallas and is rapidly growing into a global phenomenon. Its unique style of hyper-local community communication and business outreach is in demand around the world.
Executive Statement
We are the number one local community app; it's time to take our local community services global. Our venture capital investors want to see rapid growth and the same great experience for new local and virtual communities that come online, whether their members are 10 or 10000 miles away from each other.
Solution Concept
HipLocal wants to expand their existing service, with updated functionality, in new regions to better serve their global customers. They want to hire and train a new team to support these regions in their time zones. They will need to ensure that the application scales smoothly and provides clear uptime data.
Existing Technical Environment
HipLocal's environment is a mix of on-premises hardware and infrastructure running in Google Cloud Platform. The HipLocal team understands their application well, but has limited experience in global scale applications. Their existing technical environment is as follows:
* Existing APIs run on Compute Engine virtual machine instances hosted in GCP.
* State is stored in a single instance MySQL database in GCP.
* Data is exported to an on-premises Teradata/Vertica data warehouse.
* Data analytics is performed in an on-premises Hadoop environment.
* The application has no logging.
* There are basic indicators of uptime; alerts are frequently fired when the APIs are unresponsive.
Business Requirements
HipLocal's investors want to expand their footprint and support the increase in demand they are seeing. Their requirements are:
* Expand availability of the application to new regions.
* Increase the number of concurrent users that can be supported.
* Ensure a consistent experience for users when they travel to different regions.
* Obtain user activity metrics to better understand how to monetize their product.
* Ensure compliance with regulations in the new regions (for example, GDPR).
* Reduce infrastructure management time and cost.
* Adopt the Google-recommended practices for cloud computing.
Technical Requirements
* The application and backend must provide usage metrics and monitoring.
* APIs require strong authentication and authorization.
* Logging must be increased, and data should be stored in a cloud analytics platform.
* Move to serverless architecture to facilitate elastic scaling.
* Provide authorized access to internal apps in a secure manner.
HipLocal wants to improve the resilience of their MySQL deployment, while also meeting their business and technical requirements.
Which configuration should they choose?

• A. Use the current single instance MySQL on Compute Engine and several read-only MySQL servers on Compute Engine.
• B. Replace the current single instance MySQL instance with Cloud SQL, and Google provides redundancy without further configuration.
• C. Replace the current single instance MySQL instance with Cloud SQL, and configure high availability.
• D. Use the current single instance MySQL on Compute Engine, and replicate the data to Cloud SQL in an external master configuration.

You developed a Python script that retrieves information from files that are uploaded to Cloud Storage and writes the information to Bigtable. You have completed testing on your local environment and created the python-script service account with the Bigtable User IAM role. You want to deploy the code with the appropriate authentication while following Google-recommended practices. What should you do?

• A. 1. Deploy your image to Cloud Run. Create a trigger in Cloud Scheduler that triggers the service every minute.
  2. Configure IAM binding for authentication.
• B. 1. Deploy your code to Cloud Run functions. Create a Cloud Storage trigger.
  2. Create a service account key for authentication
• C. 1. Deploy your code to Cloud Run functions. Create a Cloud Storage trigger.
  2. Configure IAM binding for authentication.
• D. 1. Deploy your image to Cloud Run. Create a trigger in Cloud Scheduler that triggers the service every minute.
  2. Create a service account key for authentication.

Your team has created an application that is hosted on a Google Kubemetes Engine (GKE) cluster. You need to connect the application to a legacy REST service that is deployed in two GKE clusters in two different regions. You want to connect your application to the legacy service in a way that is resilient and requires the fewest number of steps. You also want to be able to run probe-based health checks on the legacy service on a separate port. How should you set up the connection? (Choose two.)

• A. Configure the legacy service's firewall to allow health checks originating from the application.
• B. Use Traffic Director with a sidecar proxy to connect the application to the service.
• C. Set up a proxyless Traffic Director configuration for the application.
• D. Configure the legacy service's firewall to allow health checks originating from the sidecar proxy.
• E. Configure the legacy service's firewall to allow health checks originating from the Traffic Director control plane.