Model Selection & Responsibility for A+
Short answer
Decision logic is a short sequence of checks applied to a 1) Identify whether the scenario emphasizes dedicated resources, provider-hosted shared resources, or shared-by-a-group requirements -> map to private, public, or community. If both on-prem and provider resources are combined, consider hybrid. 2) Identify what the customer is consuming: raw virtual infrastructure (IaaS), a managed platform for deploying code (PaaS), or a finished application (SaaS). 3) Use control and management responsibility cues: more customer management -> IaaS; more provider management -> PaaS or SaaS.
Why it appears on the exam
- Short choose correct deployment model and service type (e.g., "public IaaS", "private SaaS"). - Responsibility judgment: identify who patches or deploys which layer and infer the service model.
Key concepts
Concept 1
Required terms
control: Who manages and configures the layers of the stack (infrastructure, OS, application). management responsibility: The division of tasks between provider and customer (who patches, configures, and maintains which layers).
Example
"Company deploys its own VMs in a provider environment and manages the OS." Decision: IaaS on a public cloud.
Concept 2
How Model Selection & Responsibility works
Decision logic is a short sequence of checks applied to a 1) Identify whether the scenario emphasizes dedicated resources, provider-hosted shared resources, or shared-by-a-group requirements -> map to private, public, or community. If both on-prem and provider resources are combined, consider hybrid. 2) Identify what the customer is consuming: raw virtual infrastructure (IaaS), a managed platform for deploying code (PaaS), or a finished application (SaaS). 3) Use control and management responsibility cues: more customer management -> IaaS; more provider management -> PaaS or SaaS.
Example
"Several hospitals share a compliant cloud for patient records." Decision: community cloud; service type depends on whether they use a packaged app (SaaS) or run their own systems (IaaS/PaaS).
Concept 3
Common confusion
- Over-focusing on a single cue (e.g., location) rather than applying both deployment and service-type checks. Always run both checks.
Example
"A business uses a cloud-hosted CRM application with no deployment responsibility." Decision: SaaS (deployment model likely public unless otherwise specified).
Concept 4
Core 1 (220-1201) question cues
Short choose correct deployment model and service type (e.g., "public IaaS", "private SaaS"); Responsibility judgment: identify who patches or deploys which layer and infer the service model.
Example
"Company deploys its own VMs in a provider environment and manages the OS." Decision: IaaS on a public cloud.
Sample questions
Select an answer to reveal the explanation. For tracked practice and weak-area review, use the Cultiv8 app.
Q1.An A+ support scenario describes this situation: "Company deploys its own VMs in a provider environment and manages the OS." Decision: IaaS on a public cloud. Which answer fits best?
Q2.A technician sees this situation: "Several hospitals share a compliant cloud for patient records." Decision: community cloud; service type depends on whether they use a packaged app (SaaS) or run their own systems (IaaS/PaaS). Which answer should they choose?
Q3.A support scenario about Model Selection & Responsibility feels similar to a nearby topic. What is the safest way to choose an answer?
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