Explain the different tiers of 2 tier 3 tier architecture

Question

I am not able to understand which elements are called as first tier  second tier  amp  third tier  amp  where they reside  Can they reside on same machine or different machine  Which tier reside on which machine   How we can identify a particular application as a 2 tier application or 3 tier application  Please explain with example

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In a modern two-tier architecture  the server holds both the application and the data  The application resides on the server rather than the client  probably because the server will have more processing power and disk space than the PC   In a three-tier architecture  the data and applications are split onto seperate servers  with the server-side distributed between a database server and an application server  The client is a front end  simply requesting and displaying data  Reason being that each server will be dedicated to processing either data or application requests  hence a more manageable system and less contention for resources will occur   You can refer to Difference between three tier vs  n-tier

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Here is some help for 2Tier and 3Tier difference  please refer below   ANSWER  1  2Tier is Client server architecture and 3Tier is Client  Server and Database architecture  2  3Tier has a Middle stage to communicate client to server  Where as in 2Tier client directly get communication to server  3  3Tier is like a MVC  But having difference in topologies 4  3Tier is linear means in that request flow is Client   Middle Layer SErver application     Databse server and Response is reverse    While in 2Tier it a Triangular View   Controller  Model 5  3Tier is like Website while web browser is Client application middle layer   and ASP PHP language code is server application

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The general explanation is provided in the link from Dan     For specific questions your ask    They can reside on the same machine  even in the same process  JVM for Java   It is a logical distinction  what they do    not a physical one  where they are

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Wikipedia explains it better then I could  From the article - Top is 1st Tier

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First  we must make a distinction between layers and tiers   Layers are the way to logically break code into components and tiers are the physical nodes to place the components on   This question explains it better  What  39 s the difference between  quot Layers quot  and  quot Tiers quot    A two layer architecture is usually just a presentation layer and data store layer   These can be on 1 tier  1 machine  or 2 tiers  2 machines  to achieve better performance by distributing the work load   A three layer architecture usually puts something between the presentation and data store layers such as a business logic layer or service layer   Again  you can put this into 1 2  or 3 tiers depending on how much money you have for hardware and how much load you expect   Putting multiple machines in a tier will help with the robustness of the system by providing redundancy   Below is a good example of a layered architecture     source  microsoft com     A good reference for all of this can be found here on MSDN  http   msdn microsoft com en-us library ms978678 aspx

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Tiers are nothing but the separation of concerns and in general the presentation layer  the forms or pages that is visible to the user  is separated from the data tier  the class or file interact with the database   This separation is done in order to improve the maintainability  scalability  re-usability  flexibility and performance as well   A good explanations with demo code of 3-tier and 4-tier architecture can be read at  http   www dotnetfunda com articles article71 aspx

[architecture] Explain the different tiers of 2 tier & 3 tier architecture?

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