Difference between Layered Architecture and N-Tier Architecture



Layered Architecture vs N-Tier Architecture
Layered Architectural Style
Layers are the separation of code or you can say organize your come.
Layers may be residing in same computer (1 tier) or in separate computer (N- Tier). In the Application each layer communicates with other layer.
For example, normally in the application following layer is defined
·        
      Presentation Layer (UI)
·         Business Layer
·         Data Access Layer

N-Tier Architectural Style 
In the N-Tier each layer can be deployed on separate computer. In N-Tier application is logically separated into minimum three layers. Each layer is responsible for specific functionality.
Example in Web application security is important so the business layer is deployed behind firewall, and presentation layer is on separate network.
Advantages of a layered architecture:

Layered architecture provides flexibility, maintainability, and scalability.
Layered architecture parallel team works on different part of application.
Layered architecture is loosely coupled.        

Disadvantages of a layered architecture:                
      Performance is slower because extra overhead.

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