This document provides an overview of network management, monitoring, and security. It discusses the importance of network maintenance for keeping a network operational and minimizing downtime. Network monitoring software helps diagnose problems, gather statistics, and monitor the health of the network environment. Various network attacks are outlined as well as defenses such as firewalls and encryption. Bring-your-own-device policies present security risks that can be mitigated with device management, clear policies on data ownership, and exit strategies for employees.