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Client Server Architecture


CLIENT SERVER ARCHITECTURE 

Client/server architecture is a computing model in which the server hosts, delivers and manages most of the resources and services to be consumed by the client. This type of architecture has one or more client computers connected to a central server over a network or internet connection. 
Client server application consists of multiple application system combines or divided but interlinked to make various layers or tier

The application logic tier. 
The application logic tier is where all the “thinking” happens, and it knows what is allowed by your application and what is possible, and it makes other decisions.  This logic tier is also the one that writes and reads data into the data tier.

The data tier.
The data tier is where all the data used in your application are stored.  You can securely store data on this tier, do transaction, and even search through volumes and volumes of data in a matter of seconds.

The presentation tier. 
The presentation tier is the user interface.  This is what the software user sees and interacts with.  This is where they enter the needed information.  This tier also acts as a go-between for the data tier and the user, passing on the user’s different actions to the logic tier.

1-tier architecture
The simplest of Architecture are 1 tier where the Client, Server, and Database all reside on the same machine. Anytime you install a DB in your system and access it to practice SQL queries it is 1 tier architecture. But such architecture is rarely used in production.    

2-tier architecture 
2-tier architecture is used to describe client/server systems in which the client requests resources and the server responds directly to the request, using its own resources. This means that the server does not call on another application in order to provide part of the service
2-tier architecture
2-tier architecture 

3-Tier Architecture
In 3-tier architecture, there is an intermediary level, meaning that the architecture is generally split up between: a client,  the application server (also called middleware), whose task it is to provide the requested resources, but by calling on another server; and the data server, which provides the application server with the data that it requires
3-Tier Architecture
3-Tier Architecture

N-tier architecture
N-tier architecture is also called multi-tier architecture because the software is engineered to have the processing, data management, and presentation functions physically and logically separated.  That means that these different functions are hosted on several machines or clusters, ensuring that services are provided without resources being shared and, as such, these services are delivered at top capacity.  



N-tier architecture
N-tier architecture

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