Security refers to any activities designed to protect your network. Specifically, these activities protect the usability, reliability, integrity, and safety of your network and data. Effective network security targets a variety of threats and stops them from entering or spreading on your network.No single solution protects you from a variety of threats, multiple layers of security are needed, so if one fails, others still stand. Network security is accomplished through hardware and software. The software must be constantly updated and managed to protect you from emerging threats.