An example is how your computer and systems could be affected by a cybersecurity incident, due to improper cybersecurity controls, natural disasters or caused by humans or malicious users wreaking havoc, which includes denial of service attacks, malware, worms and Trojans, botnets and zombies, social network attacks, and fake shareware or security software warnings. Denial of service is an attack that successfully prevents or compromises the authorized functionality of networks, systems or applications by exhausting resources. Typically, loss of service is the inability of a particular network service, such as email, to be available or the temporary loss of all network services and connectivity. A denial-of-service attack can also destroy programs and files on affected computer systems. In some cases, denial-of-service attacks forced websites accessed by millions of people to temporarily stop working. It can be prevented by blocking the attack with packet filters on routers. This is by far the best method, and if you can do it, you're done, except that it's still a good idea to contact other ISPs who are victims of this attack. Malware, worms and Trojan horses; these spread via email, instant messaging, malicious websites and infected non-malicious websites. Some websites will automatically download malware without the user's knowledge or