DIS Cloud Infrastructure 2 — Questions and Answers
Question 1: Which cloud storage class is most cost-effective for digital imaging archives that are accessed less than once per year?
- Standard storage
- Infrequent Access storage
- Glacier Deep Archive (Correct answer)
- Reduced Redundancy Storage
Correct answer: Glacier Deep Archive
Glacier Deep Archive offers the lowest cost for long-term archival data retrieved rarely, making it ideal for inactive imaging archives.
Question 2: A DIS professional needs to replicate imaging data across two geographic regions for disaster recovery. Which strategy best achieves this?
- Single-region multi-AZ deployment
- Cross-region replication with versioning enabled (Correct answer)
- Local RAID array mirroring
- CDN edge caching
Correct answer: Cross-region replication with versioning enabled
Cross-region replication with versioning ensures data is duplicated to a geographically separate region, protecting against regional outages.
Question 3: When uploading large DICOM imaging files to cloud storage, which transfer method minimizes upload time and reduces failure risk?
- Standard single-part HTTP PUT
- Multipart upload (Correct answer)
- FTP transfer
- Email attachment
Correct answer: Multipart upload
Multipart upload splits large files into chunks uploaded in parallel, improving throughput and allowing resume on partial failure.
Question 4: In a cloud imaging pipeline, what is the primary purpose of an object lifecycle policy?
- To encrypt images at rest
- To automatically transition or delete objects based on age (Correct answer)
- To replicate objects across regions
- To index image metadata for search
Correct answer: To automatically transition or delete objects based on age
Lifecycle policies automate transitioning objects to cheaper storage tiers or deleting them after a defined period, reducing costs.
Question 5: Which network architecture element reduces latency for globally distributed imaging clients retrieving the same radiographic files?
- VPN gateway
- Content Delivery Network (CDN) (Correct answer)
- Network Load Balancer
- VPC peering
Correct answer: Content Delivery Network (CDN)
A CDN caches content at edge locations near users, dramatically reducing retrieval latency for frequently accessed imaging files.
Question 6: A hospital imaging system must ensure that cloud-stored patient images are encrypted with keys the hospital controls. Which approach satisfies this?
- Server-side encryption with provider-managed keys
- Client-side encryption with customer-managed keys (CMK) (Correct answer)
- TLS in transit only
- Password-protected ZIP archives
Correct answer: Client-side encryption with customer-managed keys (CMK)
Customer-managed keys (CMK) give the hospital full control over encryption keys, ensuring they can revoke access independent of the cloud provider.
Question 7: Which cloud service model allows a DIS professional to deploy a custom PACS application without managing the underlying operating system?
- Infrastructure as a Service (IaaS)
- Platform as a Service (PaaS) (Correct answer)
- Software as a Service (SaaS)
- Function as a Service (FaaS)
Correct answer: Platform as a Service (PaaS)
PaaS provides a managed runtime environment where developers deploy applications without patching or maintaining the underlying OS.
DIS Cloud Infrastructure 2
Which cloud storage class is most cost-effective for digital imaging archives that are accessed less than once per year?