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2. Network switch - Wikipedia

   en.wikipedia.org/wiki/Network_switch

   A modular network switch with three network modules (a total of 36 Ethernet ports) and one power supply A five-port layer-2 switch without management functionality. Modern commercial switches primarily use Ethernet interfaces. The core function of an Ethernet switch is to provide multiple ports of layer-2 bridging.

3. 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.

4. 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.

5. IEEE 802.1X - Wikipedia

   en.wikipedia.org/wiki/IEEE_802.1X

   The authenticator is a network device that provides a data link between the client and the network and can allow or block network traffic between the two, such as an Ethernet switch or wireless access point; and the authentication server is typically a trusted server that can receive and respond to requests for network access, and can tell the ...

6. Medium access control - Wikipedia

   en.wikipedia.org/wiki/Medium_access_control

   The channel access control mechanism relies on a physical layer multiplex scheme. The most widespread multiple access method is the contention-based CSMA/CD used in Ethernet networks. This mechanism is only utilized within a network collision domain, for example, an Ethernet bus network or a hub-based star topology network.

7. Fully switched network - Wikipedia

   en.wikipedia.org/wiki/Fully_switched_network

   This means that a fully switched network is a collision-free environment. The core function of a switch is to allow each workstation to communicate only with the switch instead of with each other. This in turn means that data can be sent from workstation to switch and from switch to workstation simultaneously.