Basic Information
| Field | Details |
|---|---|
| English name | Cloud Computing & Benefits of AWS Cloud |
| Full name | Cloud Computing and Benefits of the AWS Cloud |
| Chinese description | 云计算与 AWS 云优势 |
| Japanese description | クラウドコンピューティングと AWS クラウドの利点 |
| Exam frequency | ⭐⭐⭐⭐⭐ |
| Often confused with | Scalability / Elasticity / High Availability / Agility |
In one sentence
Cloud computing provides on-demand IT resources with usage-based pricing instead of fixed upfront capacity.
Key points
- Provision resources quickly and replace capital expense with variable expense.
- Benefit from economies of scale, global reach, elasticity, and faster experimentation.
- Stop guessing capacity by scaling resources with demand.
- On premises requires procurement and fixed capacity; cloud resources can be created through Console, CLI, SDK, or IaC.
- On-demand means obtaining resources when needed, scalability means handling growth, elasticity means matching capacity to demand, and agility means faster experimentation.
- Pay-as-you-go is not automatically cheap: idle resources, data transfer, licensing, and commitments still need management.
Common traps
Elasticity is not high availability, managed services do not remove customer responsibility, and “on demand” is a broader cloud principle than the EC2 On-Demand purchase option.
Exam takeaway
On-demand addresses acquisition speed, scalability addresses growth, elasticity addresses changing load, and high availability addresses service continuity during failure.