CompTIA A+ 220-1201 (4.2 - Cloud Characteristics)

Shared resources

• Internal/private cloud

- Dedicated resources

- Build your own cloud

- Pay for everything up front

- No ongoing costs

• External/public cloud

- Share resources with a public cloud

- Underlying infrastructure owned by a third-party

- Cost may be metered or up-front

Metered and non-metered

• Metered utilization

- You pay for what you use

- Cost to upload - ingress traffic

- Cost to store

- Cost to download - egress traffic

• Non-metered utilization

- You pay for a block of storage

- No cost to upload

- No cost to download

Cloud computing characteristics

• Elasticity

- Seamlessly scale up and scale down as needed

- The cloud enables instant resource provisioning

• Availability

- Systems are always available

- Redundancy provides availability

• File synchronization

- Information can be duplicated across cloud locations

• Multitenancy

- Many different clients are using the same cloud infrastructure

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