Computer studies analysis of questions and answers

slows in processing
programs start to behave abnormally
corrupts files and folders
pop up windows begin to show up
changes default program setup in your computer for most programs
computer crashes
unknown program begin to show up in your computer
passwords change
send or receive mass emails to your account
unknown programs attache themselves to the secondary and primary storage media jamming the RAM
reject any other software installed in the computer especially anti-malware
changes existing files type and properties

MENTION TWO SYMPTOMS OF A COMPUTER INFECTED WITH A VIRUS.

LEVEL: FORM 2
TOPIC: DATA SECURITY AND CONTROLS
SUB-TOPIC: Security threats and control measures

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State two ways in which one can create a password which cannot be easily accessed by hackers.

15/1/2021

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State two ways in which one can create a password which cannot be easily accessed by hackers.

Password which cannot be hacked.

By including many characters in a password
By combining different characters in a password
Use password generator manager.

State two ways in which one can create a password which cannot be easily accessed by hackers.

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

14/1/2021

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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

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.

(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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Pesa Tele Company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

12/1/2021

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Pesa Tele Company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

Encryption.
Firewalls.
User profiles/passwords/user.
Limit the number of log-in attempts.
Audit trail/tracking.
Physical protection of computers.

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A computer technician found it necessary to disable a firewall when working on a computer system. State two reasons that may have necessitated disabling of the firewall.

8/1/2021

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A computer technician found it necessary to disable a firewall when working on a computer system. State two reasons that may have necessitated disabling of the firewall.

When firewall is disabled

Testing the communication link;
When upgrading the firewall;
When there is a need to install an application and the firewall is preventing the operation;
When the firewall prevents legitimate communication.

A computer technician found it necessary to disable a firewall when working on a computer system. State two reasons that may have necessitated disabling of the firewall.

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State two ways in which hardware failure is a threat to data security.

7/1/2021

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State two ways in which hardware failure is a threat to data security.

Insecurity arising from hardware failure
Data loss due to total system failure e.g. HD crash;
The experts called upon to repair can access critical/valuable information;
Data recovery software may be used to make unauthorised backups.

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Peter has installed internet in his home computer in order to use it for browsing. State three ways in which he would prevent viruses from infecting the computer.

7/1/2021

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Peter has installed internet in his home computer in order to use it for browsing. State three ways in which he would prevent viruses from infecting the computer. (3 marks)

Install anti-virus software / anti-malware
Turn on firewall protection tool
Avoid browsing suspicious websites
Avoid clicking on pop-up windows and ads with very nice deals

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A worker is unable to travel to the office but may still be able to do the office work through telecommuting.

6/1/2021

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A worker is unable to travel to the office but may still be able to do the office work through telecommuting.

(a) Explain why the worker may use each of the following:
(i) email;
(ii) fax;
(iii) digital camera;
(iv) firewall.
(b) The worker needs to make regular backups of documents sent to the office.
State three reasons for this.
(c) Explain two benefits that the employer will get by allowing this worker to do the office work through telecommuting.

RESPONSES

(a) E-mail: - used to send and receive electronic documents to/from the office.
Receive instructions from the supervisor or co-workers.
Fax: - Used to send documents which are in non-electronic format
Digital camera - Used to capture images in picture form/video conferencing.
Firewall - Used to prevent intrusion to the home computer because telecommuting involves connection to the internet.
(b) Communication systems may fail/communication channel may fail.

The document sent may get lost due to sending to wrong address.
The documents may be re-used or updated.
Malfunctioning of either sending/ receiving computers (failure of DTE

(c) Employer will only pay for work done.

The working time is not limited to official working hours/office available 24 hours.
Employer saves on office space.
Does not have to pay for commuter allowance.
Employer may not require permanent employees.
Employer may outsource expert skills that are not available locally.

A worker is unable to travel to the office but may still be able to do the office work through telecommuting.

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State three techniques used by a network administrator to detect and prevent computer crimes.

5/1/2021

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State three techniques used by a network administrator to detect and prevent computer crimes.

(b) A company in town wishes to link its offices together. The linking may be through wireless or fibre optic network media.
(i) State two benefits that the company would gain from the use of metropolitan area network (MAN).
(ii) State three advantages of using wireless over fibre optic network media.
(iii) State two limitations of wireless communication.
(iv) State two transmission media used in wireless transmission.
(c) State three ways in which computer virus infection can be prevented other than through restricting the usage of removable storage media.

RESPONSES

(a) Audit trail

Use of antimalware software
Data encryption
Log files
Firewall
Intruder detection
User access levels
Password/Biometrics

(b)(i) High speed communication

Reduce data transfer charges
Provides a secured network .
Allow remote access
Media cannot be vandalised easily

(ii) No cumbersome cabling needed between sites.

Support multi-channel transmissions.
Wireless supports un-directed signals therefore allowing many recipients.
Do not require access rights on the land between the buildings.

(iii)Line of sight requirement.

Expensive towers required/high initial cost.
Subject to interference such as passing radio waves and weather conditions.
Very difficult to restrict access if it is un-directed.
Hard to secure
Easy to hack

(iv) Satellite

Microwave
Radio waves/blue-tooth/infrared

(e) Firewalls

Antivirus
Policy formulation on the usage of internet/password/security
Using email instead of storage devices to transfer document files.
Use genuine/authentic/unpirated software

State three techniques used by a network administrator to detect and prevent computer crimes.

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A student saved a document in a diskette. Later on, the student found that the diskette could not open arid therefore the work got lost. Give three precautions the student should have taken to ensure the work was not lost.

5/1/2021

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A student saved a document in a diskette. Later on, the student found that the diskette could not open arid therefore the work got lost.Give three precautions the student should have taken to ensure the work was not lost.

Should have kept a back-up.
Store the diskette safely e.g. in a disk bank.
Use more reliable storage media.
Regular scanning.
Avoid ejecting disk while in use.

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One way in which an organisation enforces security of its computer systems is by restricting the use of removable media such as floppy disks and flash memories. Give two reasons for this.

4/1/2021

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One way in which an organisation enforces security of its computer systems is by restricting the use of removable media such as floppy disks and flash memories. Give two reasons for this.

To minimise/control spread of viruses.
To control access to data/programs.
To control movement of data.
To control unauthorized access to data/information.

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Pesa Mingi company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

4/1/2021

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Pesa Mingi company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

Encryption.
Firewalls.
User profiles/passwords/user.
Limit the number of log-in attempts.
Audit trail/tracking.
Physical protection of computers.

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State two measures that can be put in place to control piracy of software.

4/1/2021

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State two measures that can be put in place to control piracy of software.

Enactment of relevant laws to compact the vice.
Stiff penalties for those found in possession of pirated software.
Sensitize the public on the harm of using pirated copies.
Making software affordable/cheaper.
Certificates to identify the original software.
Use of keys, passwords to secure software products.
Restrict the number of installations.
Solution

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John is a first-year student at JKUAT. He is expected to login his student portal to access online assignments. Mention three ways in which he would prevent virus from infecting his computer.

John is a first-year student at JKUAT. He is expected to login his student portal to access online assignments. Mention three ways in which he would prevent virus from infecting his computer.

Explain the terms computer fraud and alteration.

Explain the following terms. (2mks)

(a) Computer fraud

(b) Alteration

MENTION TWO SYMPTOMS OF A COMPUTER INFECTED WITH A VIRUS.

CHARACTERISTICS OF A COMPUTER INFECTED WITH A VIRUS

State two ways in which one can create a password which cannot be easily accessed by hackers.

State two ways in which one can create a password which cannot be easily accessed by hackers.

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

Pesa Tele Company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

Pesa Tele Company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

A computer technician found it necessary to disable a firewall when working on a computer system. State two reasons that may have necessitated disabling of the firewall.

A computer technician found it necessary to disable a firewall when working on a computer system. State two reasons that may have necessitated disabling of the firewall.

State two ways in which hardware failure is a threat to data security.

State two ways in which hardware failure is a threat to data security.

Peter has installed internet in his home computer in order to use it for browsing. State three ways in which he would prevent viruses from infecting the computer.

Peter has installed internet in his home computer in order to use it for browsing. State three ways in which he would prevent viruses from infecting the computer. (3 marks)

A worker is unable to travel to the office but may still be able to do the office work through telecommuting.

A worker is unable to travel to the office but may still be able to do the office work through telecommuting.

State three techniques used by a network administrator to detect and prevent computer crimes.

State three techniques used by a network administrator to detect and prevent computer crimes.

RESPONSES

A student saved a document in a diskette. Later on, the student found that the diskette could not open arid therefore the work got lost. Give three precautions the student should have taken to ensure the work was not lost.

A student saved a document in a diskette. Later on, the student found that the diskette could not open arid therefore the work got lost.Give three precautions the student should have taken to ensure the work was not lost.

One way in which an organisation enforces security of its computer systems is by restricting the use of removable media such as floppy disks and flash memories. Give two reasons for this.

One way in which an organisation enforces security of its computer systems is by restricting the use of removable media such as floppy disks and flash memories. Give two reasons for this.

Pesa Mingi company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

Pesa Mingi company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

State two measures that can be put in place to control piracy of software.

State two measures that can be put in place to control piracy of software.

Categories

Archives

​John is a first-year student at JKUAT. He is expected to login his student portal to access online assignments. Mention three ways in which he would prevent virus from infecting his computer.

​Explain the following terms. (2mks)

​(a) Computer fraud

​(b) Alteration

CHARACTERISTICS OF A COMPUTER INFECTED WITH A VIRUS

State two ways in which one can create a password which cannot be easily accessed by hackers.

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

Pesa Tele Company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

A computer technician found it necessary to disable a firewall when working on a computer system. State two reasons that may have necessitated disabling of the firewall.

State two ways in which hardware failure is a threat to data security.

​Peter has installed internet in his home computer in order to use it for browsing. State three ways in which he would prevent viruses from infecting the computer. (3 marks)

A worker is unable to travel to the office but may still be able to do the office work through telecommuting.

State three techniques used by a network administrator to detect and prevent computer crimes.

RESPONSES

A student saved a document in a diskette. Later on, the student found that the diskette could not open arid therefore the work got lost.Give three precautions the student should have taken to ensure the work was not lost.

One way in which an organisation enforces security of its computer systems is by restricting the use of removable media such as floppy disks and flash memories. Give two reasons for this.

Pesa Mingi company has offices in Nairobi and Kampala connected in a network. The management is convinced that someone is illegally gaining access to the data in their computers. State three ways in which the company can overcome this problem.

State two measures that can be put in place to control piracy of software.

Categories

Archives

John is a first-year student at JKUAT. He is expected to login his student portal to access online assignments. Mention three ways in which he would prevent virus from infecting his computer.

Explain the following terms. (2mks)

(a) Computer fraud

(b) Alteration

Peter has installed internet in his home computer in order to use it for browsing. State three ways in which he would prevent viruses from infecting the computer. (3 marks)