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Download 8th Class Computer Science Notes (Unit-2) for Federal Board (FBISE) Islamabad

Download 8th Class Computer Science Notes (Unit-2) for Federal Board (FBISE) Islamabad

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Download 8th Class Computer Science Notes (Unit-2) for Federal Board (FBISE) Islamabad

SHORT QUESTIONS:
Differentiate between the following
Virus and Worm:
  • A virus is a malicious program that infects computer program and make changes in program code.
  • A worm is a self-replicating program that does not change program code.
Virus Definition and updates:
  • Virus definition refers to the database of all current virus signature files.
  • Updates refer to the new virus signature files that are not available in virus definition already.
Email and Surfing the Internet:
  • Email is a quick way to sending message using internet.
  • Surfing Internet means to search any information on the web using search engines.
Hacker and Adware:
  • Hackers are programmers who gain access to computer system without authorization.
  • An adware automatically plays or downloads advertisements on the computer from internet.
Flash drive and floppy drives:
  • Flash drives are modern way of transmitting data from one PC to another.
  • Floppy drives are old technology having very less capacity.
Define the following:
Virus:
A virus is a malicious program that infects computer program and make changes in program code.
Email attachments:
An email attachment is a computer file sent along with an email message.
Infected flash drives:
Infected flash drives carry malicious program in it. When a user plug in the infected flash drives in computer, it spread the virus in the computer and infects the data.
Symantec:
Symantec Corporation is the manufacturer of security software for computers.
AVG:
AVG has made innovation in the industry in software development, threat detection, threat prevention and risk analysis.
What do you understand by computer security?
Computer security is the field of Information Technology which deals with data protection.
Write a short note on security threats.
Security threats are the possible ways in which the vulnerability of the computer security system can be exploited by the malignant users or software.
Who is a hacker?
Hacker is programmer who uses his expertise for malicious purpose. A hacker gains unauthorized access to a computer system. The purpose is to steal data and use it for harmful purposes or financial benefits.
How viruses are spread?
  • Through infected flash drives.
  • Email attachments.
  • Surfing insecure websites.
  • Installing pirated software
What do you understand by the term worm?
Worm is self replicating program and does not require a host program. A worm can harm in the following ways:-
1)   It can reduce the available space on the disk.
2)   It can slow down the computer.

LONG QUESTIONS
What are the ways to protect your computer from virus attacks?
·        Protect your computer with good and udpated antivirus.
·        Enable automatic Windows updates.
·        Use great caution when opening attachments.
·        Use security precautions for your PDA, cell phone, and Wi-Fi devices.
·        Back up your files regularly.
·        Stay aware of current virus news.
What is an antivirus? Explain.
·        Antivirus is software which is used to prevent, detect and remove various threats. i.e. viruses, worm, Trojan horses, spyware and adware etc.
·        They are designed to detect and remove viruses from the infected programs.
·        An antivirus uses two techniques:
             i.        Examining files to look for known viruses by means of a virus database.
           ii.        Identifying suspicious behavior from any computer program which might indicate infection.
How a computer is scanned for viruses?
  • Select Norton Antivirus from Start > Program Menu.
  • Click on Full System Scan when Norton starts.
  • The process of scanning sill start.
  • Result will be shown, when it completes.
 What is virus definition?
·        Virus definitions refer to the database of information of all current viruses.
·        It is maintained by some antivirus company.
·        The Virus definition can be downloaded with the help of Antivirus program. It is called updating virus definition.
·        Mostly Antivirus program automatically download virus definition regularly.
·        User can also update their Antivirus program manually.

What do you know about Symantec antivirus?

Symantec Corporation is the manufacturer of security software for computers, best known for its Norton brand. It is a powerful and effective antivirus program.

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Download Class Notes: Download 8th Class Computer Science Notes (Unit-2) for Federal Board (FBISE) Islamabad
Download 8th Class Computer Science Notes (Unit-2) for Federal Board (FBISE) Islamabad
Download 8th Class Computer Science Notes (Unit-2) for Federal Board (FBISE) Islamabad
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