- Forward error control – additional redundant information is transmitted with each
character or frame so that the receiver cannot only detect when errors are present, but
can also determine where the error has occurred and thus corrects it.
- Feedback (backward) error control – only enough additional information is
transmitted so that the receiver can identify that an error has occurred. An
associated retransmission control system is then used to request that another copy
of the information be sent.
- Ensures data integrity during data transmission.
gregorymasila answered the question on November 27, 2017 at 13:24
- Lack of historical data and prior knowledge of an information system makes it difficult to estimate the cost of an information systems project. Required:Formulate a checklist...(Solved)
Lack of historical data and prior knowledge of an information system makes it difficult to estimate the cost of an information systems project.
Required:
Formulate a checklist that could assist an organization in identifying, quantifying and evaluating information systems costs.
Date posted: November 27, 2017. Answers (1)
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Farmquip Ltd. designs and manufactures irrigation equipment. The irrigation equipments
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respond effectively and properly to service calls as critical to its success.
Initially, field engineers inspect faulty irrigation equipment. Currently three quarters of the
faulty irrigation equipment are referred to the repair centre, to be mended by the repair
centre.
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investigate the possibility of carrying out more field repairs with the aid of a portable expert
system, in order to reduce the turnaround time.
The prototyping approach was used, and an evaluation of the final prototype made it clear
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Required
(a) Define the term expert system and explain how it could be of use in this context.
Date posted: November 27, 2017. Answers (1)
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Date posted: November 27, 2017. Answers (1)
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Required:
Explain the nature of the following advantages:
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The term computer describes a device made up of a combination of electronic and electro-mechanical components. By itself, a computer has no intelligence and is referred to as hardware which means simply the physical equipment. Tile hardware cannot be used, until it is connected to other elements,
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Required:
Describe the six components of a computer-based information system.
Date posted: November 27, 2017. Answers (1)
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Any communication network, such as a telephone system, can be connected to others. This is an example of connectivity, the ability to connect computers, telephones and other devices to other computers, other devices and sources of information. It is this connectivity that is the foundation of Information Age.
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Required:
Explain any four activities that have become possible because of connectivity.
Date posted: November 27, 2017. Answers (1)
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In a file set up or development process, the file‘s structure is defined and its contents identified. The four characteristics considered in defining the structure and identifying the contents in a file set up or development process are; volatility, activity, size and growth.
Required:
(i) Using the example of a payroll file, explain the terms; volatility, activity, size and growth.
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Date posted: November 27, 2017. Answers (1)
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has eight branches in Kenya, two in Uganda and...(Solved)
Witu Ltd., a motor vehicle spare parts dealer, has its head office in Nairobi. The company
has eight branches in Kenya, two in Uganda and one in Rwanda. To enable the branches
share data and other resources, the company has a large database that is replicated in the
computers located in the branches. These computers are interconnected through data
communication networks. The database is centrally administered from Nairobi but the
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State the type of database used by Witu Ltd. (2 marks)
Date posted: November 27, 2017. Answers (1)
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Witu Ltd., a motor vehicle spare parts dealer, has its head office in Nairobi. The company has eight branches in Kenya, two in Uganda and one in Rwanda. To enable the branches share data and other resources, the company has a large database that is replicated in the computers located in the branches. These computers are interconnected through data communication networks. The database is centrally administered from Nairobi but the branches have flexibility and may customize the database to meet their needs.
(i)State and briefly explain advantages and disadvantages of the database used by
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Date posted: November 27, 2017. Answers (1)
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Date posted: November 27, 2017. Answers (1)
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