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Cytat
Do celu tam się wysiada. Lec Stanisław Jerzy (pierw. de Tusch-Letz, 1909-1966)
A bogowie grają w kości i nie pytają wcale czy chcesz przyłączyć się do gry (. . . ) Bogowie kpią sobie z twojego poukładanego życia (. . . ) nie przejmują się zbytnio ani naszymi planami na przyszłość ani oczekiwaniami. Gdzieś we wszechświecie rzucają kości i przypadkiem wypada twoja kolej. I odtąd zwyciężyć lub przegrać - to tylko kwestia szczęścia. Borys Pasternak
Idąc po kurzych jajach nie podskakuj. Przysłowie szkockie
I Herkules nie poradzi przeciwko wielu.
Dialog półinteligentów równa się monologowi ćwierćinteligenta. Stanisław Jerzy Lec (pierw. de Tusch - Letz, 1909-1966)
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.blocking.In a switching system, a condition in which no paths are available tocomplete a circuit.The term is also used to describe a situation in which one activitycannot begin until another has been completed.block multiplexer channel.An IBM-style channel that implements the FIPS-60channel, a U.S.channel standard.This channel is also referred to as OEMI channel and370-block mux channel.BNC connector.A standard connector used to connect IEEE 802.3 10Base2 coaxialcable to an MAU.BNN.boundary network node.In SNA terminology, a subarea node that providesboundary function support for adjacent peripheral nodes.This support includessequencing, pacing, and address translation.Also called boundary node.BOC.Bell operating company.See RBOC.Bolt, Beranek, and Newman, Inc.See BBN.BOOTP.A protocol used by a network node to determine the IP address of its Ethernetinterfaces, in order to affect network booting. CH01.book Page 380 Friday, January 7, 2000 5:35 PM380 boot programmable read-only memoryboot programmable read-only memory.See boot PROM.boot PROM.boot programmable read-only memory.A chip mounted on a printedcircuit board used to provide executable boot instructions to a computer device.border gateway.A router that communicates with routers in other autonomoussystems.Border Gateway Protocol.See BGP.boundary function.A capability of SNA subarea nodes to provide protocol supportfor attached peripheral nodes.Typically found in IBM 3745 devices.boundary network node.See BNN.boundary node.See BNN.BPDU.bridge protocol data unit.A Spanning-Tree Protocol hello packet that is sentout at configurable intervals to exchange information among bridges in the network.See also PDU.bps.bits per second.BRHR.Basic Research and Human Resources.A component of the HPCC programdesigned to support research, training, and education in computer science, computerengineering, and computational science.See also HPCC.BRI.Basic Rate Interface.An ISDN interface composed of two B channels and oneD channel for circuit-switched communication of voice, video, and data.Comparewith PRI.See also BISDN, ISDN, and N-ISDN.bridge.A device that connects and passes packets between two network segmentsthat use the same communications protocol.Bridges operate at the data link layer(Layer 2) of the OSI reference model.In general, a bridge filters, forwards, or floodsan incoming frame based on the MAC address of that frame.See also relay.bridge forwarding.A process that uses entries in a filtering database to determinewhether frames with a given MAC destination address can be forwarded to a givenport or ports.Described in the IEEE 802.1 standard.See also IEEE 802.1.bridge number.A number that identifies each bridge in an SRB LAN.Parallelbridges must have different bridge numbers.bridge protocol data unit.See BPDU. CH01.book Page 381 Friday, January 7, 2000 5:35 PMBSD 381bridge static filtering.A process in which a bridge maintains a filtering databaseconsisting of static entries.Each static entry equates a MAC destination address witha port that can receive frames with this MAC destination address and a set of ports onwhich the frames can be transmitted.Defined in the IEEE 802.1 standard.See alsoIEEE 802.1.broadband.A transmission system that multiplexes multiple independent signalsonto one cable.In telecommunications terminology, any channel having a bandwidthgreater than a voice-grade channel (4 kHz).In LAN terminology, a coaxial cable onwhich analog signaling is used.Also called wideband.Compare with baseband.Broadband ISDN.See BISDN.broadcast.Data packet that is sent to all nodes on a network.Broadcasts areidentified by a broadcast address.Compare with multicast and unicast.See alsobroadcast address.broadcast address.A special address reserved for sending a message to all stations.Generally, a broadcast address is a MAC destination address of all ones.Compare withmulticast address and unicast address.See also broadcast.broadcast and unknown server.See BUS.broadcast domain.The set of all devices that will receive broadcast framesoriginating from any device within the set.Broadcast domains are typically boundedby routers because routers do not forward broadcast frames.broadcast search.A propagation of a search request to all network nodes if thelocation of a resource is unknown to the requester.See also directed search.broadcast storm.An undesirable network event in which many broadcasts are sentsimultaneously across all network segments.A broadcast storm uses substantialnetwork bandwidth and, typically, causes network time-outs.browser.See WWW browser.BSC.binary synchronous communication.A character-oriented data link layerprotocol for half-duplex applications.Often referred to simply as bisync.BSD.Berkeley Standard Distribution.The term used to describe any of a variety ofUNIX-type operating systems based on the UC Berkeley BSD operating system. CH01.book Page 382 Friday, January 7, 2000 5:35 PM382 BTBT.burst tolerance.A parameter defined by the ATM Forum for ATM trafficmanagement.For VBR connections, BT determines the size of the maximum burst ofcontiguous cells that can be transmitted.See also VBR.buffer.A storage area used for handling data in transit.Buffers are used ininternetworking to compensate for differences in processing speed between networkdevices.Bursts of data can be stored in buffers until they can be handled by slowerprocessing devices.Sometimes referred to as a packet buffer.burst tolerance.See BT.BUS.broadcast and unknown server.A multicast server used in ELANs that is usedto flood traffic addressed to an unknown destination and to forward multicast andbroadcast traffic to the appropriate clients.See also ELAN.bus.A common physical signal path composed of wires or other media across whichsignals can be sent from one part of a computer to another.Sometimes called highway.See bus topology.bus and tag channel.An IBM channel developed in the 1960s that incorporatescopper multiwire technology
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