The Cloud model is composed of 5 Essential Characteristics, 3 service models, & 4 deployment models.
A) The 5 essential characteristics are as follows:
- On-demand self-service
- Unlimited network access
- Resource pooling
- Location independence
- Rapid elasticity
- Measured service
B) The 3 service models are as follows:
- Cloud Software as a Service (SaaS) — Use provider’s applications over a network.
- Cloud Platform as a Service (PaaS) — Deploy customer-created applications to a cloud.
- Cloud Infrastructure as a Service (IaaS) —Rent processing, storage,network capacity, and other fundamental computing resources.
C) The 4 deployment models, which can be either internally or externally implemented,are summarised as follows:
- Private cloud-Enterprise owned or leased
- Community cloud-Shared infrastructure for specific community
- Public cloud-Sold to the public, mega-scale infrastructure
- Hybrid cloud-Composition of two or more clouds
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