C.4.2 Cloud Computing Architecture Notes

Cloud Computing vs. Client-Server Architecture

1. Cloud computing is a model where computing resources (such as servers, storage, and applications) are provided over the internet as a service.
2. In contrast, client-server architecture involves a centralized server that provides resources or services to client devices.

Key Differences

1. Resource Management
   1. Client-Server: Resources are managed and maintained by the server owner.
   2. Cloud Computing: Resources are managed by a third-party provider, reducing the burden on the user.
2. Scalability
   1. Client-Server: Scaling requires adding more hardware or upgrading existing servers.
   2. Cloud Computing: Resources can be scaled up or down dynamically based on demand.
3. Cost Structure
   1. Client-Server: Requires upfront investment in hardware and ongoing maintenance costs.
   2. Cloud Computing: Operates on a pay-as-you-go model, reducing capital expenditure.
4. Accessibility
   1. Client-Server: Access is typically limited to a specific network or requires VPNs for remote access.
   2. Cloud Computing: Resources are accessible from anywhere with an internet connection.
5. Reliability and Redundancy
   1. Client-Server: Reliability depends on the server's hardware and network.
   2. Cloud Computing: Providers offer redundancy and failover mechanisms to ensure high availability.

Advantages of Cloud Computing

1. Flexibility: Users can quickly adapt to changing needs without significant investment.
2. Reduced Maintenance: The provider handles updates, security, and maintenance.
3. Global Reach: Services can be accessed from multiple locations worldwide.

Disadvantages of Cloud Computing

1. Dependency on Internet: Requires a stable internet connection.
2. Security Concerns: Data is stored off-site, raising potential privacy issues.
3. Limited Control: Users have less control over the underlying infrastructure.