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These 10 free D-CI-DS-23 questions are organized by exam domain, so you can see how each part of the Dell Cloud Infrastructure Design 2023 blueprint is tested. Reveal the answer and explanation under each question.
Classify this cloud offering: a third party owns and operates the entire environment, including a dedicated control plane, exclusively for one enterprise. Employees provision VMs through a self-service portal and administer the guest operating systems and applications.
Correct answer: B - Private cloud providing IaaS
Twenty API workers serving the same operation receive unequal amounts of traffic. Each reports its own 95th-percentile latency for the same five-minute window. A dashboard averages those values and labels the result 'service p95.' How should this measurement be corrected?
Correct answer: D - Collect compatible latency histograms from all workers and estimate p95 from their combined distribution.
During a sales promotion, runnable work accumulates in a four-vCPU VM while its total CPU use plateaus at 2 GHz. The host has substantial spare CPU, and storage and network latency remain normal. A 2-GHz aggregate CPU limit from load testing is still applied; production policy permits raising it. What adjustment targets the constraint?
Correct answer: C - Raise the VM's CPU limit to its validated production requirement.
A private-cloud cluster must carry a concurrent peak of 160 benchmarked CPU units and 2,200 GiB of RAM after any one host fails. Each identical host provides 48 usable CPU units and 512 GiB of usable RAM after infrastructure overhead. Surviving hosts may use at most 80% of their CPU capacity and 75% of their memory. Workload placement, storage, and networking impose no additional limits. What is the smallest compliant cluster?
Correct answer: B - Seven hosts; the post-failure memory requirement determines the size.
The storage proposal states: 'RAID 10 protects the archive against any two active-drive failures.' Its layout uses two-drive mirror pairs; a RAID 6 alternative meets the same capacity and performance needs. The requirement includes two failures before either drive is rebuilt. How should the reviewer respond?
Correct answer: D - RAID 6 qualifies; RAID 10 can fail if both drives in one mirror pair are lost.
Storage forecasts exceed the physical capacity of a converged platform, while compute capacity remains ample. The existing array supports expansion without moving its volumes, and the expanded array and fabric meet the projected I/O demand. A competing HCI offer adds storage only through fixed-configuration nodes that also add compute. The business wants to avoid both unused compute purchases and data migration. Which proposal fits?
Correct answer: A - Expand the existing storage subsystem while retaining the compute platform.
An intersite network failure partitions a stretched cluster. Its documented policy assigns one fixed vote to each of two data sites and one to an independent witness; a majority permits writes, and the losing site is fenced. Site A can reach the witness, while Site B has only its own vote. Each site holds a full data copy, and Site A has current data and sufficient service capacity. What is the appropriate operational response?
Correct answer: A - Keep Site A writable and Site B fenced until safe reintegration.
A cloud management platform sends an asynchronous VM-creation request. The provider creates the VM, but the response is lost; retrying the workflow creates a second VM. Resource inventory is eventually consistent, so a newly created VM may not appear immediately. The integration must recover automatically from lost responses. What requirement would prevent the duplicate creation?
Correct answer: A - Persist a client-generated ID per VM request; require the provider to deduplicate retries by ID.
A transaction service meets its response-time target when its application tier and database run in a private cloud. During cloud-bursting tests, the public-cloud instances spend most of each request waiting for sequential database exchanges across the WAN. CPU utilization and link utilization remain low. The database must stay private, both sites have enough compute capacity, and the application cannot be changed this quarter. What should the architect recommend for this transaction tier?
Correct answer: D - Keep this tier beside its database in the private cloud.
A blue-green release must support traffic reversal for 30 minutes after cutover, without interrupting service or losing acknowledged writes. The new version stores customer status in a new representation, and its proposed migration drops the column still read by the previous version. What preserves a usable rollback path?
Correct answer: C - Keep both representations consistent and usable throughout the rollback window.
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