Professional-Cloud-Security-Engineer Exam Dumps : Google Cloud Certified - Professional Cloud Security Engineer

The requirement is to protect data while in use (meaning data in memory or CPU registers, during processing). This is a concept addressed by Confidential Computing using Trusted Execution Environments (TEEs).

Extracts:

"Confidential VMs are an IaaS solution... Confidential VMs offer: Encryption for 'data in use', including the processor state and the virtual machine's memory." (Source 4.1)

"Confidential computing protects data during processing by isolating workloads inside hardware-based trusted execution environments (TEEs), ensuring even cloud operators cannot access them." (Source 4.3)

"Confidential VMs extend the standard virtual machine concept by adding hardware-enforced confidentiality controls... they ensure data remains encrypted not only at rest and in transit, but also while in use." (Source 4.4)

Options A (CMEK) and B (CSEK) protect data at rest (disk encryption). Option D (Shielded VM) protects integrity and prevents rootkit compromise but does not encrypt memory while the data is actively being processed. Only Confidential VM (or TEE) protects data in use.

MACsec (Media Access Control Security) relies on a shared secret (a pre-shared key, made up of a Connectivity Key Name, CKN, and Connectivity Association Key, CAK) to establish a secure session between the two endpoints. If the session is "operationally down," it indicates a cryptographic mismatch.

Extracts:

"MACsec is operationally down on my Cloud Interconnect connection... The issue could be caused by one of the following: The active keys on your on-premises router and Google's edge routers don't match." (Source 3.1)

The troubleshooting guide further specifies checking that the "active CKN, CAK, and start times on your on-premises router match the values that MACsec for Cloud Interconnect displays." (Source 3.1)

Therefore, the primary and most common step to resolve a "MACsec is operationally down" status is to verify that the cryptographic keys (the pre-shared key) are correctly configured and match on both the on-premises and Google Cloud routers.

Google Cloud customers with additional requirements for encryption of data over WAN can choose to implement further protections for data as it moves from a user to an application, or virtual machine to virtual machine. These protections include IPSec tunnels, Gmail S/MIME, managed SSL certificates, and Istio.