Explain three ways in which an operating system provides data security in a computer system

Explain three ways in which an operating system provides data security in a computer system

Access control:

•  Deals with the problem of verifying /authenticating the identity of a user before permitting access to the request resource (e.g. use of passwords, user account);

Encryption

•  Transforming data into an unreadable format so that they are safely transmitted;

Firewalls

•  Filters out unwanted data and programs/criminals/hackers/malicoius persons;

Log files

•  A means by which transactions in a computer system can be recorded thereby detering potential infiltrators;
• Alerts
•  Alerting a user when he/she is about to delete a file/folder.

(b)State two instances where observation is not a viable method of gathering data during system analysis stage. 

•  When the analyst wants to collect confidential information,
•  When there is a large group of people involved in the system,
•  Where the people you want to gather information from are vastly dispersed

(c) (i) State the role of each of the following data communication devices:
I. repeater 

•  A device used to re-construct data signal during data transmission to its original strength/amplify/boost/regenerate.

II. router. 

•  It is a device used to facilitate movement of data or packets between two or more LANS of different configuration (expansion of networks).
•  Delivers a packet/data directly to destination computers.
•  Interconnects different networks/provides network services.

(ii) The figure below shows a network based on the bus topology.

I. Identify the component labelled P.

•  The component P is the terminator.

II. State the function of the component labelled P.

•  Terminator in a backbone is used to prevent data signal from bouncing back/absorb signals.

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