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In 200 words or less explain the differences between a two-tier and multi-tier (n-tier) application model.

Respond to the following

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Two-tier client server architecture uses only two sets of computers, one set of clients and one set of servers. N-tier architecture uses more than two sets of computers. In this case the client is responsible for presentation logic, a database server is responsible for the data access logic and data storage, and the application logic is spread across two or more different set of servers. The primary advantages of an n-tier client-server architecture compared with a two-tier and three-tier is that it separates out the processing that occurs to better balance the load on the different servers; it is more scalable. However, the primary disadvantages to an n-tier architecture compared with two-tier and three-tier architecture, it puts greater load on the network. It generates more difficult to program and test software in n-tier architectures than in two-tier architectures because more devices have to communicate to complete a user's transaction. (Casteel, J. p5-6).

Casteel, J. (2013). Oracle 11g: PL/SQL programming. Boston, MA: Course Technology, Cengage Learning.

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APA Format Cite Work in 200 words or less

Two-tier is fast with more direct communication between the client and server. The multi-layer has an additional layer(s) between the client server and data referred to as the business layer sometimes as it manages business logic. This can be quite complex and so that comes with it's own shortcomings.

Some of the advantages listed include:

1. "High performance, lightweight persistent objects

2. Scalability - Each tier can scale horizontally

3. Performance - Because the Presentation tier can cache requests, network utilization is minimized, and the load is reduced on the Application and Data tiers.

4. High degree of flexibility in deployment platform and configuration

5. Better Re-use

6. Improve Data Integrity

7. Improved Security - Client is not direct access to database.

8. Easy to maintain and modification is bit easy, won't affect other modules

9. In three tier architecture application performance is good."

Ref: http://www.softwaretestingclass.com/what-is-difference-between-two-tier-and-three-tier-architecture/