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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.
Cisco NAC Appliance, formerly Cisco Clean Access (CCA), was a network admission control (NAC) system developed by Cisco Systems designed to produce a secure and clean computer network environment.
NFS—Network File System; NGL—aNGeL; NGSCB—Next-Generation Secure Computing Base; NI—National Instruments; NIC—Network Interface Controller or Network Interface Card; NIM—No Internal Message; NIO—Non-blocking I/O; NIST—National Institute of Standards and Technology; NLE—Non-Linear Editing system; NLP—Natural Language Processing
A notable example of the issue occurred in 2005 when a machine attached to Walmart's network hacked thousands of their servers. [ 2 ] IEEE 802.1X defines the encapsulation of the Extensible Authentication Protocol (EAP) over wired IEEE 802 networks [ 3 ] : §3.3 and over 802.11 wireless networks, [ 3 ] : §7.12 which is known as "EAP over LAN ...
Cisco Technology Handbook: SDLC and Derivatives: SDN: Software-defined networking Architecture Software-defined networking: SFD: Start-of-frame delimiter (Ethernet, HDLC, etc.) Link layer IEEE 802.3 (Ethernet), or RFC 2687 (HDLC), for examples SFP: Small form-factor pluggable Hardware Seagate Specification: S-HTTP: Secure HTTP (rarely used)
The above translates into different implementations for different uses. Here are some examples. An Internet service provider which provides network access via common modem or modem-like devices (be it PSTN, DSL, cable or GPRS/UMTS) can have one or more NAS (network access server) devices which accept PPP, PPPoE or PPTP connections, checking credentials and recording accounting data via back ...
Examples of physical networks are Ethernet networks and Wi-Fi networks, both of which are IEEE 802 networks and use IEEE 802 48-bit MAC addresses. A MAC layer is not required in full-duplex point-to-point communication, but address fields are included in some point-to-point protocols for compatibility reasons.