What are the functions of an information systems

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Reference no: EM132754

QUESTION 1

1(a) You are about to undertake the development of a system for a small business

Which System Development Life Cycle methodology would you choose and why?

(b) Compare and contrast (using diagrams) between the traditional system lifecycle and the Rapid Application Development Model

(c ) What are the strengths and limitations of the traditional system lifecycle

( d)(i) What do you understand by Feasibility Study?

(ii) What is the difference between technical feasibility and operational feasibility?

(e) Define the term Joint Application Development

QUESTION 2

(a) What is the difference between a record and a file?

(b) Draw the hierarchy of data

(d) Give one advantage and one disadvantage of a centralized system?

(e) Give one advantage and one disadvantage of a decentralized system

(f) What is a distributed system?

(g) Give one advantage and one disadvantage of a distributed system?

(h) What is the difference between a data definition language (DDL) and a data manipulation language (DML) ?

QUESTION 3

(a) What is an electronic market?

(b) The electronic job market offers many advantages for both the job seeker and the employer. Briefly state the main advantages for both

(d) What is an Electronic Data Interchange (EDI)?

(e) List 5 benefits of EDI

(f) What is an encryption?

(g) Describe how Peter and Mary can use encryption in the following scenario. Peter wants to send a message to Mary so that when Mary receives the message, Mary knows for sure that only Peter and no

one else could have sent the message

QUESTION 4

(a) What is the difference between an information system and a strategic information system?

(b) What are the functions of an information systems?

(c) What activities convert raw data to usable information in information systems? What is their relationship to feedback?

(d) There are four levels of an organization and Information systems are built to serve each level. Write down which type of information system is needed for which level

(e) Describe the relationship between the various types of information systems

QUESTION 5

(a) The types of cabling that are commonly used in LAN network are coaxial cables, twisted pairs and fiber optic cables. Compare and contrast each of them

(b) What are the main reasons for installing a network?

(d) What is the difference between an analog signal and a digital signal?

Reference no: EM132754

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