Google Updated Professional-Cloud-Architect Exam Questions and Answers by nikola

According to Google Cloud Architecture Framework and Cloud KMS documentation , when a customer requires direct control and auditability over the encryption keys used for data at rest, Customer-Managed Encryption Keys (CMEK) is the recommended path.

While Google Cloud encrypts all data at rest by default using Google-managed keys (Option B), Altostrat specifically requires control and auditability . By using CMEK through Cloud Key Management Service (Cloud KMS) , Altostrat can manage the key rotation schedules, revoke access to keys immediately to " kill " access to the data, and view detailed logs in Cloud Audit Logs every time the key is used to encrypt or decrypt a media asset.

Option D is superior to Option C because client-side encryption with a self-managed HashiCorp Vault adds significant operational overhead and complexity, contradicting the business requirement to " Simplify infrastructure management . " CMEK integrates natively with Cloud Storage, allowing for a seamless experience while meeting the strict security requirements for sensitive documentaries and interviews. Furthermore, the use of IAM roles and groups for fine-grained access control aligns with the principle of least privilege, ensuring that only authorized service accounts and users can access the sensitive buckets and the keys required to decrypt them.

According to the Google Cloud Architecture Framework: Software Development and Delivery section, unit testing is the foundational practice for verifying the smallest parts of an application—such as functions, classes, or individual microservices—in complete isolation . The requirement specifically asks for a method to ensure services function correctly " in isolation, " which is the primary definition of a unit test.

In Altostrat’s modernized CI/CD environment, unit tests are executed early in the pipeline (the " left " side of DevSecOps). They typically use " mocks " or " stubs " to simulate external dependencies like BigQuery, Cloud Storage, or other microservices. This ensures that the internal logic of a specific service—for instance, the metadata extraction logic or the pricing algorithm—is mathematically and logically sound before it interacts with the rest of the system.

While Integration testing (Option D) is vital for ensuring services talk to each other correctly, it does not test them " in isolation. " End-to-end testing (Option C) validates the entire user journey but is slow and complex to debug. Load testing (Option B) focuses on performance under stress rather than functional correctness. To meet the technical requirement of " Modernize CI/CD for containerized deployments, " Altostrat must prioritize a robust suite of unit tests to provide developers with rapid feedback and ensure the high reliability of their operational workflows.

According to the Google Cloud Architecture Framework and Google Cloud Armor documentation , Google Cloud Armor is the enterprise-grade solution for protecting applications and services against Distributed Denial of Service (DDoS) attacks and web-based exploits. Altostrat requires a solution that addresses " multi-vector " attacks at " various layers, " specifically the Network/Transport layers ( L3/L4 ) and the Application layer ( L7 ).

Google Cloud Armor provides built-in, always-on protection against L3 and L4 volumetric attacks at the edge of Google’s network, preventing malicious traffic from reaching the backend GKE clusters or Cloud Run functions. For L7 (Application Layer) protection, Cloud Armor offers Web Application Firewall (WAF) capabilities, including pre-configured rule sets (based on OWASP Top 10 ), rate limiting, and Adaptive Protection . The latter uses machine learning to detect anomalies in traffic patterns specific to Altostrat’s applications, automatically suggesting rules to block sophisticated botnets or application-layer floods.

While Cloud NGFW (Option B) provides essential network filtering, it lacks the native L7 inspection and global DDoS scrubbing capabilities inherent to Cloud Armor. VPC Service Controls (Option A) focus on data exfiltration and API security perimeters, and Security Command Center (Option D) is a posture management and threat detection tool rather than an active traffic mitigation service. Deploying Cloud Armor at the global load balancing tier ensures Altostrat maintains the high availability and reliability required for its global media streaming audience.

https://cloud.google.com/blog/products/databases/getting-started-with-time-series-trend-predic tions-using-gcp