There is no technical support commitment provided by Google for products in 'Preview' launch stage.

"At Preview, a product or feature is ready for testing by customers before adopting it for production use at GA. Preview offerings are often publicly announced, but are not necessarily feature-complete, and Google provides no SLAs or technical support commitments for these. Unless stated otherwise by Google, Preview offerings are intended for use in test environments only."

Reference: https://cloud.google.com/support-hub/   &  https://cloud.google.com/products#section-22

A service level agreement (SLA) is a contract between a service provider (either internal or external) and the end user that defines the level of service expected from the service provider. Some common SLA’s are uptime, Response Time, etc. https://csrc.nist.gov/glossary/term/service_level_agreement

A Project facilitates organization of services and objects and also use this method of segmentation for billing and accounting.

Community Cloud – The cloud infrastructure is planned for selective use by a particular community of consumers from organizations that have mutual interests like security needs, policy, and compliance considerations.

By default ,the limit is 5 per project. You can contact support to have this adjusted as needed. The exam has a few trivia around projects and quotas.

gcloud compute project-info describe --project [PROJECT_ID]

Reference: https://cloud.google.com/vpc/docs/using-vpc

Web Security Scanner identifies security vulnerabilities in your App Engine, Google Kubernetes Engine (GKE), and Compute Engine web applications. It crawls your application, following all links within the scope of your starting URLs, and attempts to exercise as many user inputs and event handlers as possible.

Please review this page before the exam !

https://cloud.google.com/security-command-center/docs/concepts-web-security-scanner-overview

Preemptible VM is an instance that you can create and run at a lower cost than normal instances.

However, Compute Engine might stop (pre-empt) these instances if it requires access to those resources for other tasks. Preemptible instances are excess Compute Engine capacity, so their availability varies with usage.

Live at most 24 hours Can be pre-empted with a 30 second notification via API and are Discounted significantly.

Google Cloud Pub/Sub is a scalable, durable event ingestion and delivery system.

Pub/Sub allows services to communicate asynchronously, with latencies on the order of 100 milliseconds.

Pub/Sub is used for streaming analytics and data integration pipelines to ingest and distribute data. It is equally effective as messaging-oriented middleware for service integration or as a queue to parallelize tasks.

Pub/Sub enables you to create systems of event producers and consumers, called publishers and subscribers. Publishers communicate with subscribers asynchronously by broadcasting events, rather than by synchronous remote procedure calls (RPCs).

Reference: https://cloud.google.com/pubsub/docs/overview

Multi-Tenancy: In cloud computing, multitenancy means that multiple customers of a cloud vendor are using the same computing resources. Even though they share resources, cloud customers aren’t aware of each other, and their data is kept totally separate. Multitenancy is a crucial component of cloud computing; without it, cloud services would be far less practical. Multitenant architecture is a feature in many types of public cloud computing, including IaaS, PaaS, SaaS, containers, and serverless computing.

Reference: https://www.cloudflare.com/learning/cloud/what-is-multitenancy/