What are the types of MS. clustering technology ? what is the difference between them ? when to use each one ?

1. Network Load Balancing: Network Load Balancing acts as a front-end cluster, distributing incoming IP traffic across a cluster of servers, and is ideal for enabling incremental scalability and outstanding availability for e-commerce Web sites

2. Component Load Balancing: Component Load Balancing distributes workload across multiple servers running a site's business logic.

3. Cluster Service: Cluster Service acts as a back-end cluster; it provides high availability for applications such as databases, messaging and file and print services.