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A basic form of NAC is the 802.1X standard. Network access control aims to do exactly what the name implies—control access to a network with policies, including pre-admission endpoint security policy checks and post-admission controls over where users and devices can go on a network and what they can do.
A typical (non-free) WiFi connection is a form of NAC. The user must present some sort of credentials (or a credit card) before being granted access to the network. In its initial phase, the Cisco Network Admission Control (NAC) functionality enables Cisco routers to enforce access privileges when an endpoint attempts to connect to a network.
network technology MTU: Maximum Transmission Unit Multiple layers NAC: Network access control Link and other layers IEEE 802.1x: NAS: Network-attached storage Hardware / Storage Computer data storage: NAT: Network Address Translation Internet Layer Cisco Internet Protocol Journal: A look Inside Network Address Translators: NBMA
2NF—second normal form; 3GL—third-generation programming language; 3GPP—3rd Generation Partnership Project – 3G comms; 3GPP2—3rd Generation Partnership Project 2; 3NF—third normal form; 386—Intel 80386 processor; 486—Intel 80486 processor; 4B5BLF—4-bit 5-bit local fiber; 4GL—fourth-generation programming language; 4NF ...
IEEE 802.1X is an IEEE Standard for port-based network access control (PNAC). It is part of the IEEE 802.1 group of networking protocols. It provides an authentication mechanism to devices wishing to attach to a LAN or WLAN.
In data networking, telecommunications, and computer buses, an acknowledgement (ACK) is a signal that is passed between communicating processes, computers, or devices to signify acknowledgment, or receipt of message, as part of a communications protocol.
It thus forms the basis of most of the link layer (OSI layer 2) networking upon which upper-layer protocols rely to produce complex, functioning networks. Many network interfaces support changing their MAC address. On most Unix-like systems, the command utility ifconfig may be used to remove and add link address aliases.
It is capable of managing wired or wireless networks in an in-band or out-of-band configuration mode, and Virtual Private networks in an in-band only configuration mode. Cisco NAC Appliance is no longer in production and no longer sold as of the early 2010s. Mainstream support ending in 2015. Extended support ending in 2018.
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