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30 multiple-choice questions and 14 flashcards on Core 1 — Virtualization and Cloud Computing, about 6% of the CompTIA A+ bank. Every one carries a written rationale.
Core 1 — Virtualization and Cloud Computing is one of 9 chapters in CoStudy's CompTIA A+ bank, and it holds 30 of the bank's 540 multiple-choice questions — roughly 6% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
10 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
A data center standardizes on hypervisors installed directly on server hardware with no general-purpose operating system beneath them. This design is chosen PRIMARILY because it:
Answer: B — removes a host operating system layer, reducing overhead and attack surface
B) Correct — a bare-metal hypervisor owns the hardware directly, so there is no host operating system consuming resources or presenting extra vulnerabilities. A) Guests still receive virtualized hardware; that abstraction is what makes them portable. C) Suspending to a desktop session describes a hosted hypervisor running on a workstation. D) Memory must still be allocated to each guest regardless of hypervisor type.
A hospital keeps patient records on infrastructure it owns and operates in its own data center, dedicated entirely to itself, while using a provider for public-facing marketing pages. The records environment is BEST characterized as:
Answer: C — a private cloud, because the infrastructure serves a single organization
C) Correct — a private cloud is defined by dedicated use by a single organization, regardless of who operates the hardware. A) A community cloud is shared by several organizations with common requirements, which is not the case for this dedicated environment. B) Internet reachability does not make an environment public; tenancy does. D) The overall posture is hybrid, but the question asks specifically about the records environment, so naming the whole arrangement misses the target.
Which cloud-computing characteristic describes resources scaling automatically with demand?
Answer: A — Rapid elasticity
Rapid elasticity = auto-scale up/down. Measured = metered billing. Self-service = users provision without admin. Pooling = multi-tenant resource sharing. NIST cloud essential characteristics. Trick distractors are also NIST characteristics — easy to swap.
A support team must reproduce a customer bug that only appears on an older operating system version, while keeping their own machines on the current build. The MOST appropriate use of client-side virtualization is to:
Answer: B — run the older version in a guest virtual machine on each technician's workstation
B) Correct — a guest virtual machine gives a faithful older environment on demand without disturbing the technician's primary system. A) Dual booting works but forces a reboot to switch, interrupting the support workflow the team must maintain. C) Dedicated legacy hardware is expensive and idles most of the time. D) Compatibility libraries approximate the old environment and can hide or alter the very bug being reproduced.
Before deploying several guests on a workstation, a technician reviews resource requirements. The item LEAST relevant to whether the guests will run is:
Answer: D — the monitor's native resolution and pixel density
D) Correct — display resolution affects how comfortably a technician views guest consoles but has no bearing on whether the guests can run. A) Virtualization extensions are a baseline requirement for accelerated guests. B) Virtual disks consume real capacity, and running out halts guests. C) Memory is usually the first hard limit on how many guests a workstation can host.
A customer asks why their cloud virtual machine occasionally shows variable disk latency even though nothing changed on their side. The MOST likely explanation rooted in cloud design is:
Answer: A — shared underlying resources being contended by other tenants
A) Correct — pooled hardware means neighboring workloads can contend for the same storage and network paths, producing variability the tenant did not cause. B) Metering records usage; it does not silently throttle a running instance as a matter of course. C) Elasticity adds and removes whole instances rather than shrinking a running machine's disk performance. D) A provider patch reboot would show as an outage and a restart, not as intermittent latency.
An administrator is warned about VM escape. The scenario this term describes is:
Answer: D — code in a guest breaking isolation to reach the hypervisor or other guests
C) Live migration is a normal operational feature and is not an attack.A) CPU starvation is a resource contention problem, serious but not a breach of isolation. B) Runaway snapshot growth is a capacity management failure. D) Correct — VM escape is the failure of the isolation boundary, letting code inside a guest act on the hypervisor or neighboring guests.
A user edits a document in a synchronized cloud folder on a laptop while offline, then opens the same file on a phone. When the laptop reconnects, the service reports a conflict. The BEST explanation is that:
Answer: B — both copies were modified independently and the service cannot merge them
B) Correct — file synchronization propagates changes between endpoints, and when two endpoints change the same file independently the service must surface a conflict rather than guess. A) Conflict reporting is a normal reconciliation outcome and does not imply corruption. C) A storage shortfall produces a sync error about capacity, not a conflicting-versions message. D) Sync services are deliberately cross-platform, so matching operating systems are not required.
An architect must choose between containers and virtual machines for workloads that require different operating system kernels and strong isolation between tenants. The BEST choice and reason is:
Answer: C — virtual machines, because each guest runs its own kernel behind a hypervisor
C) Correct — differing kernels and strong tenant separation are exactly what full virtual machines provide, since each guest has its own kernel isolated by the hypervisor. A) Container isolation is real but is enforced by a shared kernel and is generally weaker than hardware-assisted separation. B) Containers share the host kernel and cannot each load their own kernel, which is the core constraint here. D) Claiming identical separation ignores the shared-kernel boundary that distinguishes the two approaches.
A retailer keeps its order database on private infrastructure for compliance but bursts its web tier into a provider's capacity during holiday peaks, with the two connected and orchestrated together. This is BEST described as:
Answer: A — a hybrid cloud arrangement between the two
A) Correct — combining a private environment with public capacity, joined so workloads move between them, is the definition of hybrid. B) A community cloud implies multiple peer organizations sharing a platform, which is absent here. C) Calling them independent ignores the orchestration that makes bursting possible and is the whole point. D) Reserved capacity is a purchasing arrangement inside a public cloud and does not account for the private compliance tier.
4 cards from the 14 in this chapter.
What is the shared responsibility model?
Cloud provider secures infrastructure (data centers, hypervisors). Customer secures data, identity, configuration, and (for IaaS) OS/apps. Boundary varies by service tier.
Define IaaS, PaaS, and SaaS by what the customer manages in each.
IaaS: the provider supplies virtual compute, storage, and networking and the customer manages the operating system upward. PaaS: the provider also manages the OS and runtime and the customer manages only the application and its data. SaaS: the provider manages everything and the customer manages only data and user access.
What is virtualization?
Running multiple OS instances (VMs) on a single host. A hypervisor abstracts CPU, memory, storage, and network for each VM.
Public vs. private vs. hybrid vs. community cloud?
Public: shared multi-tenant (AWS, Azure). Private: dedicated for one org. Hybrid: blend of public+private. Community: shared by orgs with similar concerns.
These are a sample. The full Core 1 — Virtualization and Cloud Computing chapter runs 44 items with per-chapter progress tracking, on the web and in the iOS app.