The article introduces network security as the practice of protecting a computer network infrastructure from unauthorized access, misuse, malfunction, or other security breaches. It underscores that networks, whether wired or wireless, are constantly under threat—not just from external attackers but also internal risks. To secure them properly, organizations must deploy layered security controls, combining technologies like firewalls, intrusion detection/prevention systems (IDS/IPS), virtual private networks (VPNs), access control, and proper encryption. Policies and monitoring are also vital, to both anticipate and respond to threats.
It also discusses some of the core principles that guide network security design. One is ensuring confidentiality, integrity, and availability of data (often called the CIA triad): keeping data secret from unauthorized viewers, accurate and unaltered, and accessible when needed. Another is least privilege and role-based access — making sure users and devices only have the access they absolutely need. Furthermore, the article highlights that security is not a once-off setup but requires ongoing maintenance: regular software updates, vulnerability assessments, logging and auditing, and staying current with new threats and best practices.
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