Network security protects communication infrastructure, including routers, switches, servers, and connected devices, against internal and external threats. This is achieved through tools such as firewalls, which block unauthorized access, and intrusion detection/prevention systems (IDS/IPS), which identify and respond to suspicious activity in real-time.
Network segmentation further divides systems into secure zones, limiting attackers' lateral movement. These strategies are crucial in preventing attacks like ransomware, phishing, and data interception.