difference between 2 tier and 3 tier
What is the difference between tier and layer?
In plain english, the Tier refers to "each in a series of rows or levels of a structure placed one above the other" whereas the Layer refers to "a sheet, quantity, or thickness of material, typically one of several, covering a surface or body".
What do tiers mean?
Specifically, tiers are places where layers are deployed and where layers run. In other words, tiers are the physical deployment of layers. Source: Rockford Lhotka, Should all apps be n-tier? Read Scott Hanselman's post on the issue: A reminder on "Three/Multi Tier/Layer Architecture/Design":
How much does a drug tier cost?
This tier also includes some high-priced generic drugs. For most plans, you'll pay around $37 to $45 for drugs in this tier. These are higher-priced brand-name and generic drugs not in the preferred tier. For most plans, you'll pay around 45% to 50% of the drug cost in this tier. These are the most expensive drugs on the drug list.
What is a physical tier?
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.
Overview
In this article, we’ll see the difference between two prevalent terms in Computer Science that are often mistakenly interchanged: Layers and Tiers. baeldung.com
Layers
The term layer refers to a logical separation of code. In other words, it’s a coherent set of related functionality. Structuring applications in layers is a way to organize our codebase better. For this reason, portability and maintainability are drivers that push us to use this kind of structure. Indeed, we find an application of this concept in v
Tiers
On the other hand, the term tier refers to the physical structure. Tiers define where to deploy the layers, without necessarily a one-to-one mapping. So when we talk of an application’s tiers, we mean its topology. As an example, let’s see how we can physically divide the layered application of the previous paragraph: Above, we see a representation
Conclusion
In this article, we defined the concepts of Layer and Tier and how these map to logical and physical architecture. baeldung.com
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