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Network security, a specialized field within cybersecurity, encompasses the policies, procedures, and technologies organizations use to protect their networks and any network assets or traffic. Regardless of industry or size, all organizations must prepare against threats like data loss, unauthorized access, and network-based attacks.

Network security is crucial for protecting business-critical infrastructure and assets, minimizing the attack surface, and preventing advanced attacks. Network security solutions use a layered approach to protect networks internally and externally. Vulnerabilities are present in many areas, including end-point devices, users, applications, and data paths.

In recent years, organizations and networks have changed. The modern IT environment is distributed, with the growth of the cloud, edge computing, and the internet of things (IoT). The massive transition to remote work has also created new security challenges. In the 2020s, network security must go beyond the traditional network perimeter, to adopt a zero trust security approach.