Layers ?

Hello

There are layers at architecture. I know 3 layers. 1-) Data Access Layer 2-) Stored Procedure 3-) Codes at Cs. is it right ? or am i wrong?

I want to know more about layer. For example i heard security layer and etc. Can you tell me all of layers ? Also Can you give me example link or example codes about layers ?

Note: i know DAL and Stored Procedures. So i dont need example for DAL and Stored Procedures.

Thank you.