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In three-tiered client-server architectures there are three main layers which are located on three different machines. The three layers of three-tiered client-server architecture would be user machine, middle-tier server and backend server. These three layers are more commonly known as the user-interface, application server and database server. Each of these layers has designated roles which they have to carry out.

The first layer is the user-interface which is the layer where the users would have direct interaction. The user-interface level would present the application to the user. The first layer would also allow thin clients, which new tendency in distributed systems to move the complexity away from the end-user device to the services in the internet. The second layer which is the application logic which is the processing level acts as a bridge to connect the application logic with the data on the database servers. The application server also carries out other tasks such as maintaining security. The third layer which is the data logic or the data level it has the main responsibility of storing all the data in a database server. Since the layers separate the logical elements from the physical servers it would be much easier to be maintained.

The first layer is the user-interface which is the layer where the users would have direct interaction. The user-interface level would present the application to the user. The first layer would also allow thin clients, which new tendency in distributed systems to move the complexity away from the end-user device to the services in the internet. The second layer which is the application logic which is the processing level acts as a bridge to connect the application logic with the data on the database servers. The application server also carries out other tasks such as maintaining security. The third layer which is the data logic or the data level it has the main responsibility of storing all the data in a database server. Since the layers separate the logical elements from the physical servers it would be much easier to be maintained.

The first layer is the user-interface which is the layer where the users would have direct interaction. The user-interface level would present the application to the user. The first layer would also allow thin clients, which new tendency in distributed systems to move the complexity away from the end-user device to the services in the internet. The second layer which is the application logic which is the processing level acts as a bridge to connect the application logic with the data on the database servers. The application server also carries out other tasks such as maintaining security. The third layer which is the data logic or the data level it has the main responsibility of storing all the data in a database server. Since the layers separate the logical elements from the physical servers it would be much easier to be maintained.