Say That I am A CISO for a company. There are many protection I could use and implement to ensure availability of my system. There is a few I would implement. One, is I will try to see if there are any open points in the software or firewall because with those open point the system will be or is in danger. A other protection that I would implement will be make sure that the network I am working on is safe and secure. If I know it is not I will implement a VPN to secure my network. Plus another protection I would do is apply any antivirus software. But if there already is a antivirus software I will check if it is updated and replace the outdated ones.