FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A computer virus, like a flu virus, is designed to spread from host to host and has the ability to replicate. Just as flu viruses cannot reproduce without a host cell, computer viruses cannot reproduce and spread from computer to computer without programming code in a file or document.

Detailed explanation-2: -Typically, computer viruses spread through malicious online downloads, infected email attachments, or by plugging in infected hardware like an external flash drive (USB stick). Computer viruses can spread through almost any method of file sharing, as long as the virus can avoid detection by antivirus programs.

Detailed explanation-3: -Ans. A computer virus is a kind of malicious computer program, which when executed, replicates itself and inserts its own code, which spreads a harmful virus in the system.

Detailed explanation-4: -The most common way of transmission of computer viruses in boot sector is physical media. When reading the VBR of the drive, the infected floppy disk or USB flash drive connected to the computer will transfer data, and then modify or replace the existing boot code.

Detailed explanation-5: -A computer virus is a program that spreads by first infecting files or the system areas of a computer or network router’s hard drive and then making copies of itself. Some viruses are harmless, others may damage data files, and some may destroy files.