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Client/Server Technology Two-Tier Architecture Three-Tier Architecture

Client/Server Technology Two-Tier Architecture Three-Tier Architecture. Josh Antonelli Jenn Lang Joe Schisselbauer Chad Williams. Client/Server Technology.

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Client/Server Technology Two-Tier Architecture Three-Tier Architecture

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  1. Client/Server TechnologyTwo-Tier ArchitectureThree-Tier Architecture Josh Antonelli Jenn Lang Joe Schisselbauer Chad Williams

  2. Client/Server Technology • A computational architecture that involves client processes (service consumers) requesting service from server processes (service providers). • Client/server applications provide a reasonable mechanism for organizations to design applications that fit their business needs.

  3. Features of Client/Server Model • Clients and Servers are functional modules with well defined interfaces, i.e., they hide internal information. • Each client/server relationship is established between two functional modules. One module initiates service requests and the other module responds to these requests. • Information exchange between clients and servers , i.e., requests and responses, are strictly through messages. • Message exchange is typically interactive. • Clients and servers may run on separate dedicated machines connected through a network.

  4. Two Tier Architecture • Divided into two parts: • Client Tier – where requests are sent from the client to the database • Data Tier – consists of the database, where requests are processed and data is sent back to the client.

  5. Two Tier Architecture • Characteristics: • Is a Client Server Application • Runs very fast because there is no intermediary (Application Server) • Easy to Maintain

  6. Two Tier Architecture • Negatives: • Scalability Problems, where performance weakens as the number of users increases. • Limited Interoperability. • Expensive maintenance costs.

  7. Three-Tier Architecture • Definition: An application partitioned into three logical tiers: the presentation tier, the processing tier, and the data tier. • Presentation tier (Tier 1): responsible for the graphical user interface layer. • Processing tier (Tier 2): contains the business logic and is responsible for the processing associated with the applications supported. • Data tier (Tier 3): Holds the permanent data associated with the applications supported.

  8. Three-Tier Architecture Cont’d • Benefits of three-tier architecture: • Provides a greater degree of flexibility • Provides increased security, as security can be defined at each level • Tasks are shared between servers, which leads to increased performance • Has easy scalability as each tier can scale horizontally

  9. Quiz Time! • Client/Server technology involves a client requesting an update only from one server. 2. Client/server technology is based upon two modules. One to initiate service requests, another to respond to these requests.

  10. 3. Two-Tier Architecture is: a. a function all on it’s own b. a Client/Server application c. very slow • Two-Tier Architecture is both expensive and difficult to maintain.

  11. 5. Three-Tier Architecture has three tiers. They are: a. Client, Processor, Manager b. Data, Logic, Design c. Presentation, Processing, Data • Three-Tier Architecture is the most secure.

  12. Answers • False • True • B • False – it is expensive, but EASY to maintain • C • True

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