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Data link
A serial communications path between nodes or devices without any intermediate switching nodes. Also, the physical twoway connection between such devices.
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An Internet protocol used to run IP over serial lines such as telephone circuits or RS232 cables interconnecting two systems. SLIP is now being replaced by PointtoPoint Protocol. See PointtoPoint Protocol. An older technology developed to support TCP/IP communications over asynchronous serial connections, such as serial cables or modem dial- up.
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The emerging layer 3 switching technology integrates routing with switching to yield very high routing throughput rates in the millionsofpacketspersecond range. The movement to layer 3 switching is designed to address the downsides of the current generation of layer 2 switches, which are functionally equivalent to bridges. These downsides for a large, flat network include being subject to broadcast storms, spanning tree loops, and address limitations that drove the injection of routers into bridged networks in the late 1980s. Currently, layer 3 switching is represented by a number of approaches in the industry.
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Highspeed switch that forwards packets between datalink segments. Most LAN switches forward traffic based on MAC addresses. This variety of LAN switch is sometimes called a frame switch. LAN switches are often categorized according to the method they use to forward traffic: cutthrough packet switching or storeandforward packet switching. Multilayer switches are an intelligent subset of LAN switches. Compare with multilayer switch. See also cutthrough packet switching, storeandforward packet switching.
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An encryption technique that protects entire communications circuits by creating a secure tunnel between two points. This is done by using either a hardware or software solution that encrypts all traffic entering one end of the tunnel and decrypts all traffic exiting the other end of the tunnel. Encryption of information between nodes of a communications system. The application of online cryptooperations to a link of a communications system so that all information passing over the link is encrypted in its entirety.
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A device that propagates electrical signals from one cable to another without making routing decisions or providing packet filtering. In OSI terminology, a repeater is a physical layer intermediate system. See bridge, router. A network device used to amplify signals on network cabling to allow for longer distances between nodes. Also known as a concentrator or amplifier.
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