COMPUTER NETWORKING

Detailed explanation-1: -Most viruses, Trojan horses, and worms are activated when you open an attachment or click a link contained in an email message. If your email client allows scripting, then it is possible to get a virus by simply opening a message. It’s best to limit what HTML is available in your email messages.

Detailed explanation-2: -Email-Worms spread via email. The worm sends a copy of itself as an attachment to an email message or a link to its file on a network resource (e.g. a URL to an infected file on a compromised website or a hacker-owned website).

Detailed explanation-3: -Viruses spread by infecting other programs, either on the same computer or on other computers connected to it over a network. Any newly infected programs/computers will try to infect even more. Pure data files are safe. This includes graphics and sound files such as .

Detailed explanation-4: -Phishing Emails By far the most common method for hackers and state-sponsored hacking organizations to spread malware is through phishing emails. Hackers have become incredibly skilled at crafting emails that trick employees into clicking on links or downloading a file that contains malicious code.