The first rule of security is that you need to treat all devices on your network as if they are compromised and may be used against you. The second rule of security is to refer to the first rule. I say this not because security is impossible but more to point out that when securing a network, you need to separate or create segments/VLANs for the devices on the network to provide security against each other. This segmentation protects the network from an attacker connecting directly to an open port and having access to secure devices.

Right now, in mid-2017, the security issue all over the news is Ransomware, where computer files are encrypted or hidden from their owners displaying a screen on the computer stating this and that the user is to send money to the kidnapper. Before Ransomware, and continuing today, a big issue has been Distributed Denial of Service (DDoS) attacks, where thousands of compromised systems send traffic to a single destination...