Differ three layer architecture and three tier architecture ? (.net)

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Logical layers are merely a way of organizing your code. Typical layers include Presentation, Business and Data -- the same as the traditional 3-tier model. But when we’re talking about layers, we’re only talking about logical organization of code. In no way is it implied that these layers might...
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Logical layers are merely a way of organizing your code. Typical layers include Presentation, Business and Data – the same as the traditional 3-tier model. But when we’re talking about layers, we’re only talking about logical organization of code. In no way is it implied that these layers might run on different computers or in different processes on a single computer or even in a single process on a single computer. All we are doing is discussing a way of organizing a code into a set of layers defined by specific function. Physical tiers however, are only about where the code runs. Specifically, tiers are places where layers are deployed and where layers run. In other words, tiers are the physical deployment of layers. read less
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Tier indicates a physical separation of components, which may mean different assemblies such as DLL, EXE, etc. on the same server or multiple servers. Layer indicates logical separation of components, such as having distinct namespaces and classes for the Database Access Layer, Business Logic Layer...
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Tier indicates a physical separation of components, which may mean different assemblies such as DLL, EXE, etc. on the same server or multiple servers. Layer indicates logical separation of components, such as having distinct namespaces and classes for the Database Access Layer, Business Logic Layer and User Interface Layer. read less
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Layers refer to logical separation of code. Logical layers help you organise your code better. For example an application can have the following layers. 1)Presentation Layer or UI Layer 2)Business Layer or Business Logic Layer 3)Data Access Layer or Data Layer The above 3 layers reside...
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Layers refer to logical separation of code. Logical layers help you organise your code better. For example an application can have the following layers. 1)Presentation Layer or UI Layer 2)Business Layer or Business Logic Layer 3)Data Access Layer or Data Layer The above 3 layers reside in their own projects, may be 3 projects or even more. When we compile the projects we get the respective layer DLL. So we have 3 DLL's now. Depending upon how we deploy our application, we may have 1 to 3 tiers. As we now have 3 DLL's, if we deploy all the DLL's on the same machine, then we have only 1 physical tier but 3 logical layers. If we choose to deploy each DLL on a separate machine, then we have 3 tiers and 3 layers. Finally Layers are a logical separation and Tiers are a physical separation. In other words, Tiers are the physical deployment of layers. read less
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In 3 layer architecture, the Database Access Layer (DAL), Business Logic Layer (BLL) and User Interface Layer (UIL) resides as 3 different project and the output of these 3 projects (.dll file) must be together in the same server or on same machine in order for the system to run.However in 3 tier architecture,...
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In 3 layer architecture, the Database Access Layer (DAL), Business Logic Layer (BLL) and User Interface Layer (UIL) resides as 3 different project and the output of these 3 projects (.dll file) must be together in the same server or on same machine in order for the system to run.However in 3 tier architecture, the Database Access Layer (DAL), Business Logic Layer (BLL) and User Interface Layer (UIL) reside as 3 different projects. But each of the projects can be deployed at the different server or at the different machines and distributed functionality is explored. read less
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Difference between Layer architecture and Tier architecture are as - Typical layers include Presentation, Business and Data; we’re only talking about logical organization of code. In no way is it implied that these layers might run on different computers or in different processes on a single computer...
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Difference between Layer architecture and Tier architecture are as - Typical layers include Presentation, Business and Data; we’re only talking about logical organization of code. In no way is it implied that these layers might run on different computers or in different processes on a single computer or even in a single process on a single computer. Physical tiers however, are only about where the code runs. Specifically, tiers are places where layers are deployed and where layers run. In other words, tiers are the physical deployment of layers. read less
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IT Professional Trainer with 15 years of experience in IT Industry

Tier indicates a physical separation of components, which may mean different assemblies such as DLL, EXE, etc. on the same server or multiple servers. While Layer indicates logical separation of components, such as having distinct namespaces and classes for the Database Access Layer, Business Logic Layer...
read more
Tier indicates a physical separation of components, which may mean different assemblies such as DLL, EXE, etc. on the same server or multiple servers. While Layer indicates logical separation of components, such as having distinct namespaces and classes for the Database Access Layer, Business Logic Layer and User Interface Layer. read less
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