Each model describes the core of a solution to the problems around us and repeated occurrence of the problem. In this way, you can use the program again and again without having to do repetitive work.
The key is that the pattern repeatability, problems with the repeatability of scene modes bring the solution can be reused.
Web site architecture has some common patterns, through the study of these patterns, can grasp the general ideas and solutions for large sites to guide our architecture design.
2.1 site architecture model
Objective: To achieve high performance sites, highly available, scalable and easy, scalable, security
2.1.1 stratified