Question

Define virus. Explain the virus related threats and the counter measures applied.

Answer 1

Answer:

what is virus?

virus is nothing but a piece of coding that enters your computer without your knowledge and infects it.

types of virus :

1.boot sector virus : it harms the boot sector of the computer. removable media will be spreaded by this virus. i.e. hard discs will be infected.

2.direct action virus : this type of virus directly attacks the computer.

3.resident virus : this type of virus gets installed in computer and it is hard to identify this type of virus.

4.multipartite virus: this virus spreads in multiple ways as the name describes. it infects the boot sector and executable files (.bat , .com)

5.polymorphic virus: it is a type of viru which automatically changes it's code when it passes to a different machine.

6.overwrite virus: this type of virus will destroy the original code by overwriting the code.

7.spacefiller virus: it affects the system by changing the functionality of it. it can rewrite some particular codes.

virus is also named as vital information under siege:

virus is named vital information under siege because the vital information is getting seized by the computer.

cant we escape from these viruses:

• we can escape these by installing antivirus in our computers such as avg antivirus and quickheal. these will protect your computer.
• we should not open any unknown links or emails which can harm our computer.
• use a strong firewall, this will protect your computer.
• perform scans daily.
• use dns(domain name system if you are surfing)