Definition
Network security encompasses the policies, processes, and technologies implemented to protect the integrity, confidentiality, and accessibility of computer networks and data. It involves safeguarding network resources from unauthorized access, misuse, modification, or denial of service. In practice, network security functions by establishing secure connections, segmenting networks, and monitoring traffic for suspicious activity. This is crucial for preventing data breaches, maintaining operational continuity, and ensuring compliance with regulations. For instance, firewalls and intrusion detection systems act as gatekeepers, blocking malicious traffic before it reaches internal systems. Unlike general cybersecurity, network security specifically focuses on the infrastructure and data in transit. You will encounter network security concepts extensively on CompTIA Security+, Network+, CySA+, and CISSP certifications.