Infrastructure as a Service for A+
Short answer
IaaS gives the customer access to virtualized infrastructure: VMs, block storage, virtual networks. The provider supplies the infrastructure; the customer installs and manages the OS, middleware, applications, and data. At A+ level, the key mental model is "customer has relatively high control over the software stack; provider manages the underlying hardware and virtualization layer."
Why it appears on the exam
- Identify IaaS when scenarios mention virtual machines, raw storage, and customer-managed OS layers. - Distinguish IaaS from PaaS/SaaS by asking what the customer still manages (OS and apps vs provider-managed runtime vs finished app).
Key concepts
Concept 1
Required terms
IaaS: A cloud service model that provides virtualized compute, storage, and networking resources while leaving more system control to the customer.
Example
A technician supports a client who "rents virtual servers and manages the operating systems themselves" -> IaaS.
Concept 2
How Infrastructure as a Service works
IaaS gives the customer access to virtualized infrastructure: VMs, block storage, virtual networks. The provider supplies the infrastructure; the customer installs and manages the OS, middleware, applications, and data. At A+ level, the key mental model is "customer has relatively high control over the software stack; provider manages the underlying hardware and virtualization layer."
Example
A company uses provider block storage volumes attached to VMs they configure -> IaaS.
Concept 3
Common confusion
- If a scenario mentions "managed database service" or "platform for app deployment," it may point toward PaaS rather than IaaS. - If the scenario describes a finished application the user simply accesses, it is SaaS, not IaaS.
Example
A technician supports a client who "rents virtual servers and manages the operating systems themselves" -> IaaS.
Concept 4
Core 1 (220-1201) question cues
Identify IaaS when scenarios mention virtual machines, raw storage, and customer-managed OS layers; Distinguish IaaS from PaaS/SaaS by asking what the customer still manages (OS and apps vs provider-managed runtime vs finished app).
Example
A company uses provider block storage volumes attached to VMs they configure -> IaaS.
Sample questions
Select an answer to reveal the explanation. For tracked practice and weak-area review, use the Cultiv8 app.
Q1.A technician is troubleshooting this situation: A technician supports a client who "rents virtual servers and manages the operating systems themselves" -> IaaS. What should they identify?
Q2.For this A+ objective, the scenario says: A technician supports a client who "rents virtual servers and manages the operating systems themselves" -> IaaS. What is the best match?
Q3.A support scenario about Infrastructure as a Service feels similar to a nearby topic. What is the safest way to choose an answer?
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