Network security is the practice of preventing and protecting against unauthorized intrusion into corporate networks. It complements endpoint security, which focuses on how devices interact, and on the connective tissue between them. The SANS Institute says network security is implemented by the tasks and tools you use to prevent unauthorized people or programs from accessing your networks and the devices connected to them. Cisco, a networking infrastructure company, uses the following schema to break down the different types of network security, and it’s a useful way to think about the different ways to secure a network.”]