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2. Network security - Wikipedia

   en.wikipedia.org/wiki/Network_security

   Network security consists of the policies, processes and practices adopted to prevent, detect and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources. [1] Network security involves the authorization of access to data in a network, which is controlled by the network administrator.

3. Computer security - Wikipedia

   en.wikipedia.org/wiki/Computer_security

   An example of a physical security measure: a metal lock on the back of a personal computer to prevent hardware tampering. Computer security (also cybersecurity, digital security, or information technology (IT) security) is the protection of computer software, systems and networks from threats that can lead to unauthorized information disclosure, theft or damage to hardware, software, or data ...

4. Firewall (computing) - Wikipedia

   en.wikipedia.org/wiki/Firewall_(computing)

   Firewall (computing) In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. [1][2] A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet. [3]

5. Internet security - Wikipedia

   en.wikipedia.org/wiki/Internet_security

   Internet security is a branch of computer security. It encompasses the Internet, browser security, web site security, [ 1 ] and network security as it applies to other applications or operating systems as a whole. Its objective is to establish rules and measures to use against attacks over the Internet. [ 2 ]

6. Computer network - Wikipedia

   en.wikipedia.org/wiki/Computer_network

   A computer network is a set of computers sharing resources located on or provided by network nodes. ... Network security is used on a variety of computer networks ...

7. Network access control - Wikipedia

   en.wikipedia.org/wiki/Network_Access_Control

   Network access control (NAC) is an approach to computer security that attempts to unify endpoint security technology (such as antivirus, host intrusion prevention, and vulnerability assessment), user or system authentication and network security enforcement.