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2. 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.

3. Network Admission Control - Wikipedia

   en.wikipedia.org/wiki/Network_Admission_Control

   Network Admission Control (NAC) refers to Cisco's version of network access control, which restricts access to the network based on identity or security posture.When a network device (switch, router, wireless access point, DHCP server, etc.) is configured for NAC, it can force user or machine authentication prior to granting access to the network.

4. Firewall (computing) - Wikipedia

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

   User ID allows firewall rules to be crafted based on individual user identities, rather than just fixed source or destination IP addresses. This enhances security by enabling more granular control over who can access certain network resources, regardless of where they are connecting from or what device they are using.

5. Access-control list - Wikipedia

   en.wikipedia.org/wiki/Access-control_list

   In computer security, an access-control list (ACL) is a list of permissions [a] associated with a system resource (object or facility). An ACL specifies which users or system processes are granted access to resources, as well as what operations are allowed on given resources. [ 1 ]

6. Distributed firewall - Wikipedia

   en.wikipedia.org/wiki/Distributed_firewall

   A firewall is a system or group of systems (router, proxy, or gateway) that implements a set of security rules to enforce access control between two networks to protect the "inside" network from the "outside" network. They filter all traffic regardless of its origin—the Internet or the internal network.

7. Using McAfee: Firewalls - AOL Help

   help.aol.com/articles/Using-McAfee-Firewalls

   Setting the firewall's security level to Open allows the firewall to grant access to all inbound and outbound network connections. To grant access for previously blocked programs, use the Program Permissions pane. To set the firewall's security level to Open: 1.