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Simplex
Data travels in one direction (from A to B). An example of a simplex link would be scoreboards
such as those used in hockey, basketball, or other sports. The information is entered at a console
by the. score/timekeeper and sent serially to large displays that everybody can see.
Half-duplex
Data travels in one direction (from A to B) and then the other direction (from B to A) but not at
the same time. The RS-485 is half-duplex.
Full-duplex
Data can travel in both directions at the same time.
Kavungya answered the question on May 14, 2019 at 08:39
- (i) Define the term "mobile computing”
(ii) Outline five limitations of mobile computing devices(Solved)
(i) Define the term "mobile computing”
(ii) Outline five limitations of mobile computing devices
Date posted: May 14, 2019. Answers (1)
- Analyse the following modes of communication with reference to-cost, speed of transmission
and reliability:
(i) Serial mode.
(ii) Parallel mode.(Solved)
Analyse the following modes of communication with reference to-cost, speed of transmission
and reliability:
(i) Serial mode.
(ii) Parallel mode.
Date posted: May 14, 2019. Answers (1)
- Information systems controls consist of all methods, policies and organizational procedures that
ensure the safety of the organization’s assets, the accuracy and reliability of its accounting
records...(Solved)
Information systems controls consist of all methods, policies and organizational procedures that
ensure the safety of the organization’s assets, the accuracy and reliability of its accounting
records and operational adherence to management standards.
Required:
Describe five types of general information systems controls.
Date posted: May 14, 2019. Answers (1)
- Differentiate between information systems (IS) and information technology (IT).(Solved)
Differentiate between information systems (IS) and information technology (IT).
Date posted: May 14, 2019. Answers (1)
- a) Identify the procedures that could be adopted to control the spread of computer viruses in
an organisation.
b) Name six threats to an organization’s information system...(Solved)
a) Identify the procedures that could be adopted to control the spread of computer viruses in
an organisation.
b) Name six threats to an organization’s information system that could arise as a result of
computer crime.
Date posted: May 14, 2019. Answers (1)
- Identify three vital services which information systems can provide to a business organization.(Solved)
Identify three vital services which information systems can provide to a business organization.
Date posted: May 14, 2019. Answers (1)
- a) Identify three roles of- information systems in-an. organisation.
b) State and explain the components of an information system.(Solved)
a) Identify three roles of- information systems in-an. organisation.
b) State and explain the components of an information system.
Date posted: May 14, 2019. Answers (1)
- Organizations individual use different types of information systems for different purposes.
Describe the characteristics of the following information systems:
i) Transaction processing systems (TPS).
ii) Sales and marketing...(Solved)
Organizations individual use different types of information systems for different purposes.
Describe the characteristics of the following information systems:
i) Transaction processing systems (TPS).
ii) Sales and marketing systems.
Date posted: May 14, 2019. Answers (1)
- a) i) Define the term "information systems
ii) State five types of information systems
b) As the information system manager of a company whose operations are highly...(Solved)
a) i) Define the term "information systems
ii) State five types of information systems
b) As the information system manager of a company whose operations are highly automated,
you have noticed that a large number of employees are suffering from occupational over-use
syndrome otherwise known as repetitive strain injury (RSI)
Identify four measures that you could adopt in order to minimize occupational over-use
syndrome
Date posted: May 14, 2019. Answers (1)
- Explain four security concerns that personal computer users face in an organization.(Solved)
Explain four security concerns that personal computer users face in an organization.
Date posted: May 14, 2019. Answers (1)
- Small and micro-business enterprises have greater access to a variety of information technology
tools that improve productivity such as netbooks, smartphones and cloud computing-based services. However,...(Solved)
Small and micro-business enterprises have greater access to a variety of information technology
tools that improve productivity such as netbooks, smartphones and cloud computing-based services. However, without adequate end point security practices in place, many enterprises
are exposed to both external and internal threats that could cripple their operations.
Identify the end point security threats to small and micro-business enterprises,
Date posted: May 14, 2019. Answers (1)
- a) To be considered an executive information system (EIS), a software product should address
certain needs of the executive.
b) Briefly describe four structural elements of a...(Solved)
a) To be considered an executive information system (EIS), a software product should address
certain needs of the executive.
b) Briefly describe four structural elements of a computer system.
Date posted: May 14, 2019. Answers (1)
- For each of the following threats to information systems, security, identify two conditions that
might increase the vulnerability of the information systems security:
i. Operator error.
ii. Hardware...(Solved)
For each of the following threats to information systems, security, identify two conditions that
might increase the vulnerability of the information systems security:
i. Operator error.
ii. Hardware malfunction,
iii. Software bugs.
iv. Data errors.
v. Accidental disclosure of information.
vi. Theft.
vii. Vandalism and sabotage.
Date posted: May 14, 2019. Answers (1)
- (i) Define the term "knowledge management system".
(ii) Highlight four benefits of a knowledge management system to a business organisation,
(iii) Outline three major problems a company...(Solved)
(i) Define the term "knowledge management system".
(ii) Highlight four benefits of a knowledge management system to a business organisation,
(iii) Outline three major problems a company might face when implementing a new
knowledge management system
Date posted: May 14, 2019. Answers (1)
- Briefly explain the following terms:
i. Uniform Resource Locator.
ii. Cloud computing.(Solved)
Briefly explain the following terms:
i. Uniform Resource Locator.
ii. Cloud computing.
Date posted: May 14, 2019. Answers (1)
- a) Outline three functions of an organisation that could be automated.
b) Briefly, describe how a computer system could be modified for use by physically challenged
persons(Solved)
a) Outline three functions of an organisation that could be automated.
b) Briefly, describe how a computer system could be modified for use by physically challenged
persons
Date posted: May 14, 2019. Answers (1)
- Briefly explain four authentication techniques that could enhance security of information
systems in an organisation.(Solved)
Briefly explain four authentication techniques that could enhance security of information
systems in an organisation.
Date posted: May 14, 2019. Answers (1)
- (i) Define the term "management information systems" in the context of information systems.
(ii) Explain three advantages of management information systems to the banking sector.(Solved)
(i) Define the term "management information systems" in the context of information systems.
(ii) Explain three advantages of management information systems to the banking sector.
Date posted: May 14, 2019. Answers (1)
- a) (i) Highlight four benefits of office automation systems.
(ii) Explain four characteristics of information that is suitable for decision making.
b) Briefly explain four applications of...(Solved)
a) (i) Highlight four benefits of office automation systems.
(ii) Explain four characteristics of information that is suitable for decision making.
b) Briefly explain four applications of cloud computing.
Date posted: May 14, 2019. Answers (1)
- Discuss the evolution of information systems.(Solved)
Discuss the evolution of information systems.
Date posted: May 14, 2019. Answers (1)