N Tier (Multi-Tier), 3-Tier, 2-Tier Architecture - Shikshaglobe

Content Creator: Vijay Kumar

What is N-Tier?

An N-Tier Application program is one that is circulated among at least three separate PCs in a conveyed network.

The most widely recognized type of n-level is the 3-level Application, and it is ordered into three classifications.

N-Tier (Multi-Tier), 3-Tier, and 2-Tier Architectures in Software Development

In software development, architectural design is crucial for structuring and organizing a software application's components and interactions. Different architectures cater to varying complexity and scalability requirements. Three commonly used architectures are N-Tier (Multi-Tier), 3-Tier, and 2-Tier architectures. Let's explore each of them:

1. N-Tier (Multi-Tier) Architecture:

  • Definition: N-Tier architecture, also known as Multi-Tier architecture, is a design pattern where an application is divided into multiple logical layers or tiers, each responsible for specific functions and interactions.
  • Key Characteristics:
    • Scalability: N-Tier architectures are highly scalable, allowing the addition of new layers or components as needed.
    • Separation of Concerns: Each tier has a distinct responsibility, promoting a clean separation of concerns.
    • Flexibility: Changes in one tier don't necessarily impact other tiers, making it adaptable to evolving requirements.
  • Typical Tiers in N-Tier Architecture:
    • Presentation Tier (Client): Handles the user interface and user interaction.
    • Application Tier (Middle Tier): Contains business logic and acts as an intermediary between the presentation and data tiers.
    • Data Tier (Database): Stores and manages data.
  • Use Cases: N-Tier architecture is suitable for large, complex applications that require scalability, maintainability, and a clear separation of responsibilities. It's often seen in enterprise-level web applications.

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2. 3-Tier Architecture:

  • Definition: 3-Tier architecture is a subset of N-Tier architecture, primarily consisting of three layers: presentation, application, and data tiers.
  • Key Characteristics:
    • Simplified Structure: Compared to N-Tier, it has a simpler structure, making it easier to develop and manage.
    • Scalability: Still offers good scalability, especially for medium-sized applications.
    • Moderate Separation of Concerns: While there's a degree of separation, it may not be as strict as N-Tier.
  • Typical Tiers in 3-Tier Architecture:
    • Presentation Tier (Client): Handles user interface and interaction.
    • Application Tier (Middle Tier): Contains business logic and serves as an intermediary.
    • Data Tier (Database): Stores and manages data.
  • Use Cases: 3-Tier architecture is ideal for applications of moderate complexity where a moderate degree of separation of concerns is required. It's commonly used in web applications and smaller enterprise systems.

3. 2-Tier Architecture:

  • Definition: 2-Tier architecture, also known as Client-Server architecture, is a simpler design where the application is divided into two primary layers: the client and the server.
  • Key Characteristics:
    • Basic Structure: It is the simplest of the three, with only a client and a server component.
    • Limited Separation of Concerns: There's minimal separation of concerns, as most of the application logic resides on the server.
  • Typical Tiers in 2-Tier Architecture:
    • Client Tier: Handles the user interface and user input.
    • Server Tier: Contains both the application logic and the data storage, making it responsible for most processing.
  • Use Cases: 2-Tier architecture is suitable for small-scale applications or when rapid development is required. It's commonly used in desktop applications and simple web applications.

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  • N-Tier (Multi-Tier) Architecture: Suitable for large, complex applications with high scalability and clear separation of responsibilities.
  • 3-Tier Architecture: Ideal for medium-sized applications that require a moderate degree of separation of concerns.
  • 2-Tier Architecture: Simplest and suitable for small-scale applications with minimal separation of concerns.

UI programming on the client's PC

The business rationale in a more brought together PC, and

Required information in a PC that deals with a data set.

This design model gives Software Developers the to make Reusable applications/frameworks with the greatest adaptability.

In N-level, "N" alludes to various levels or layers being utilized like - 2-level, 3-level or 4-level, and so on. It is likewise called "Multi-Tier Architecture".

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The n-level engineering is an industry-demonstrated programming design model. It is appropriate to help endeavor-level client-server applications by giving answers for versatility, security, adaptation to internal failure, reusability, and viability. It assists designers with making adaptable and reusable applications.

N-Tier Architecture

A diagrammatic portrayal of an n-level framework portrays here - show, application, and information base layers.

These three layers can be additionally partitioned into various sub-layers relying upon the prerequisites.

A portion of the famous locales who have applied this design is

Deals Force venture application

Indian Railways - IRCTC

Amazon.com, and so on.

A typical term to recall, in order to comprehend the idea all the more plainly.

Conveyed Network: It is an organization design, where the parts situated at network PCs coordinate and impart their activities exclusively by passing messages. It is an assortment of various frameworks arranged at various hubs however appears to the client as a solitary framework.

It gives a solitary information correspondence network that can be overseen independently by various organizations.

In an illustration of Distributed Network-where various clients are associated inside LAN design on one side and on the opposite side they are associated with high-velocity switches alongside a rack of servers containing administration hubs.

Client-Server Architecture: It is a design model where the client (one program) demands help from a server (another program) for example It is a solicitation reaction administration given over the web or through an intranet.

In this model, the Client will act as one bunch of programs/code which executes a bunch of activities over the organization. While Server, then again, is a bunch of another program, which sends the outcome sets to the client framework as mentioned.

In this, the client PC gives a connection point to an end client to demand help or an asset from a server, and then again server then, at that point, processes the solicitation and presentations the outcome to the end client.

An illustration of a Client-Server Model-an ATM machine. A bank is a server for handling the application inside the huge client data sets and an ATM machine is the client having a UI with some basic application handling.

Stage: In the software engineering or programming industry, a stage is a framework on which application programs can run. It comprises a blend of equipment and programming that have implicit guidance for a processor/chip to perform explicit tasks.

In additional straightforward words, the stage is a framework or a base where any applications can run and execute to get a particular undertaking.

An illustration of Platform - An individual machine stacked with Windows 2000 or Mac OS X as instances of 2 unique stages.

Data set: It is an assortment of data in a coordinated manner with the goal that it tends to be effectively gotten to, overseen, and refreshed.

Instances of Database - MySQL, SQL Server, and Oracle Database are some normal Db's.

Sorts of N-Tier Architectures

There are various sorts of N-Tier architecture, similar to 3-level Architecture, 2-Tier Architecture, and 1-Tier Architecture.

In the first place, we will see 3-level Architecture, which is vital.

3-Tier Architecture

By taking a gander at the underneath chart, you can undoubtedly recognize that 3-level engineering has three distinct layers.

Show layer

Business Logic layer

Data set layer

Here we have taken a straightforward illustration of the understudy structure to see this multitude of three layers. It has data about an understudy like - Name, Address, Email, and Picture.

Code Explanation

The above code characterizes the essential planning of a front-end perspective on applications as well as the calling of the elements of different layers so they can be incorporated with one another.

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Business Access Layer -

This is the capability of the business layer which acknowledges the information from the application layer and passes it to the information layer.

The business rationale goes about as a connection point between the Client layer and Data Access Layer

All business rationale - like approval of information, computations, and information addition/alteration is composed under the business rationale layer.

It makes correspondence quicker and simpler between the client and the information layer

Characterizes a legitimate work process action that is important to get done with a job.

Clarification of code

The code is utilizing the capability of the business layer, which will acknowledge the information for the application layer and pass it to the information layer. The Business layer codes go about as a middle person between the capabilities characterized in the show layer and information layer and calling the capabilities bad habits - versa.

Information Access Layer

This is the information layer capability, which gets the information from the business layer and plays out the vital activity into the data set.

Clarification of code

The code characterizes in the dataset layer above acknowledges the whole solicitation: mentioned by the framework and plays out the necessary activities into the data set.

2-Tier Architecture:

It is like Client-Server design, where correspondence happens between client and server.

In this sort of programming design, the show layer or UI layer runs on the client side while the dataset layer gets executed and put away on the server side.

There is no Business rationale layer or prompt in the middle between client and server.

Single Tier or 1-Tier Architecture:

It is the least difficult one as it is comparable to running the application on the PC. Each of the necessary parts for an application to run are on a solitary application or server.

Show layer, Business rationale layer, and information layer are undeniably situated on a solitary machine.

Consequently, it is a piece of a program that encodes true business issues and decides how information can be refreshed, made, put away, or changed to finish the total undertaking.

N-Tier Architecture Tips and Development

Taking into account that the product experts should have full control of every one of the layers of the engineering, tips on n-level design are given underneath

Attempt to decouple layers from one more layer however much as could be expected by utilizing a strategy like a cleanser XML.

Utilize a few robotized devices to produce planning between a business rationale layer and a social data set layer (information layer). Devices that can help in displaying these planning procedures are - Entity Framework and Hibernate for .Net and so on.

In the client moderator layer, put a typical code for every one of the clients in a different library however much as could be expected. This will boost the code reusability for a wide range of clients.

A reserve layer can be added to a current layer to accelerate the exhibition.


The N-level design assists with dealing with every one of the parts (business layer, show layer, and data set layer) of an application under one rooftop.

Applications that use little quantities of clients in a neighborhood can profit from n-level engineering.

Such building configuration finds out keeping up with, increasing, and sending an application on the Internet effectively.

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