Your antivirus software is outdated, and several workstations on your network haven't had their operating systems updated in over a year. Which kind of security risk does this pose?

Because the systems are out of date, they are more vulnerable to attacks. These systems are regarded as non-compliant systems. Failure to update all software on your network is a breach of security best practices. Zombie and botnet attacks occur when the victim is unaware that malware is installed on their computer. Their computer is a zombie, and a botnet attack is when numerous zombies are used to attack a system. Typically, a brute-force attack uses software that repeatedly tries passwords or codes until it finds the one that will grant access. In a zero-day attack, hackers start using a hole in a web browser or other piece of software the moment the developer learns about it, before they have time to patch the hole.