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CIS339 EOC Questions - Chapter 13

CIS339 EOC Questions - Chapter 13 - EOC Questions Chapter...

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EOC Questions Chapter 13 Systems Analysis and Design with UML Version 2.0 Chapter 13 Physical Architecture Layer Design 1. What are the four basic functions of any information system? The four basic functions of any information system are: Data storage Data access logic Application logic Presentation logic 2. What are the three primary hardware components of any physical architecture? The three primary hardware components of any physical architecture are: Servers Client computers Network 3. Name two examples of a server. Servers are typically larger computers that are used to store software and hardware that can be accessed by anyone who has permission. Servers can come in several flavors: mainframes, minicomputers and microcomputers. 4. Compare and contrast server-based architectures, client-based architectures and client-server- based architectures. Although there are numerous ways in which the software components can be placed on the hardware components, there are three principal application architectures in use today: server-based architectures, client-based architectures and client–server architectures. The most common architecture is the client–server architecture. Server-based architecture : Being one of the very first computing architectures, this had the server performing all the four application functions. Advantages: Simple architecture works well Single point of control cause all messages flow through server Application software is developed and stored on one computer and all the data are on the same computer. Page 1
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EOC Questions Chapter 13 Disadvantages: Server must process all messages Increase in applications results in slower response rate Server upgrades come in large increments and are expensive. Client-based architecture : Clients generally are personal computers on a local area network and the server computer is on the same network. Advantages: Simple architecture and works well Disadvantages: All data on the server must travel to the client for processing, resulting in network overload and high power requirement on client computers. Client-Server architecture : Most organizations today are moving to client–server architectures, which attempt to balance the processing between the client and the server by having both do some of the application functions. In these architectures, the client is responsible for the presentation logic while the server is responsible for the data access logic and data storage. The application logic may reside on either the client, the server, or be split between both. Advantages: They are scalable They are able to support different types of clients and servers. For thin client server architectures that use Internet standards, it is simple to clearly separate the presentation logic, the application logic, and the data access logic and design each to be somewhat independent.
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