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The traditional way of allocating a single channel,such as a telephone trunk,among multiple competing users is to chop up its （ ） by using one of the multiplexing schemes, such as FDM. If there are N users, the bandwidth is divided into N equal-sized portions,with each user being assigned one portion.Since each user has private frequency （ ） ,there is now no interference among users.When there is only a small and constant number of users,each of which has a steady stream or heavy load of （ ）this division is a simple and efficent allocation mechanism.A wireless example is FM radio stations.Each station gets a portion of the FM band and uses it at most of the time to broadcast its signal. However when the number of senders is large and varying or the traffic is （ ） ,FDM presents some problems.If the spectrum is cut up into N regions and fewer than N users are currently intrested in communicating ,a large piece of valuable spectrum will be wasted.And if more than N users want to communicate ,some of them will be denied （ ）for lack of bandwidth,even if some of the users who have been assigned a frequency band ever transmit or receive anything.
A.capabilityB.capacityC.abilityD.powerA.bandB.rangeC.domainD.assignmentA.trafficB.dataC.informationD.communicationsA.ContinuousB.steadyC.burstyD.flowA.allowanceB.connectionC.percussionD.permission
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更多 “ The traditional way of allocating a single channel,such as a telephone trunk,among multiple competing users is to chop up its （ ） by using one of the multiplexing schemes, such as FDM. If there are N users, the bandwidth is divided into N equal-sized portions,with each user being assigned one portion.Since each user has private frequency （ ） ,there is now no interference among users.When there is only a small and constant number of users,each of which has a steady stream or heavy load of （ ）this division is a simple and efficent allocation mechanism.A wireless example is FM radio stations.Each station gets a portion of the FM band and uses it at most of the time to broadcast its signal. However when the number of senders is large and varying or the traffic is （ ） ,FDM presents some problems.If the spectrum is cut up into N regions and fewer than N users are currently intrested in communicating ,a large piece of valuable spectrum will be wasted.And if more than N users want to communicate ,some of them will be denied （ ）for lack of bandwidth,even if some of the users who have been assigned a frequency band ever transmit or receive anything.A.capabilityB.capacityC.abilityD.powerA.bandB.rangeC.domainD.assignmentA.trafficB.dataC.informationD.communicationsA.ContinuousB.steadyC.burstyD.flowA.allowanceB.connectionC.percussionD.permission ” 相关考题
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The traditional way of allocating a single channel among multiple competing users is to chop up its ( ) by using one of the multiplexing schemes such as FDM (Frequency Division Multiplexing). If there are N users, the bandwidth is divided into N equal-sized portions, with each user being assigned one portion. Since each user has a private frequency ( ), there is no interference among users.When there is only a small and constant number of users, each of which has a steady stream or a heavy load of ( 本 题 ), this division is a simple and efficient allocation mechanism. A wireless example is FM radio stations. Each station gets a portion of the FM band and uses it most of the time to broadcast its signal.However, when the number of senders is large and varying or the traffic is ( ), FDM presents some problems. If the spectrum is cut up into N regions while fewer than N users are currently interested in communicating, a large piece of valuable spectrum will be wasted. If more than N users want to communicate, some of them will be denied ( ) for lack of bandwidth.?A. traffic
B. date
C. bursty
D. flow
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Which IP telephony deployment model uses an H.225 Gatekeeper-Controlled trunk for call admission control within existing H.323 environments?（）A、single site with centralized call processingB、single site with distributed call processingC、multisite with centralized call processingD、multisite with distributed call processing
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A customer has purchased a triple channel memory kit containing three DDR3 RAM modules. Theserver the RAM is intended for only has a dual channel capable motherboard. Which of the following is the BEST action to perform？（）A、Install only two modules as the RAM has to be installed in pairsB、Purchase one additional RAM module to make it even. Three modules will function as triplechannel and the additional module will be for parityC、Purchase dual channel memory. The triple channel memory may be incompatible with theserver motherboardD、Install the RAM.Two modules will perform as dual channel and one as single channel
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A server needs to have memory added to support a new application. It currently is using PC4200 in a single channel configuration. Which of the following would be the correct memory upgrade？（）A、Install larger capacity PC2100 dual channel memory modules.B、Add a PCI expansion card with PC2100 single channel memory modules.C、Install smaller capacity PC4200 single channel memory modules.D、Install larger capacity PC4200 single channel memory modules.
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You execute the following command to perform a backup by using Recovery Manager （RMAN）： RMAN run {allocate channel c1 type sbt; backup datafile 1; } The command errors out. A part of the error message is as follows： RMAN/x7f03009： failure of allocate command on c1 channel ORA/x7f19554： error allocating device， device type： SBT_TAPE， device name： What could explain why the statement failed？（）A、sbt is not a valid device type.B、Media Management Library was not loaded.C、The sbt device cannot be used for data file backups.D、No path was defined in the ALLOCATE CHANNEL command.E、The channel is currently being used by another RMAN session.
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单选题When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.A
a junction with the preferred channel to the leftB
a sharp turn in the channel to the rightC
the starboard side of the channelD
a wreck to be left on the vessel's port side
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单选题In the last paragraph the phrase “this wide, confused wilderness” refers to ______.A
personal experienceB
wild weeds among good plantsC
the information from the parentsD
the vast store of traditional practices
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多选题A virtual port channel （vPC） allows links that are physically connected to two different Cisco Nexus devices to appear as a single port channel to a third device. Which are the mandatory steps for configuring vPC？ （）AEnable feature vPCBDefine domainsCEstablish peer keepalive connectivityDCreate a peer linkEConfigure the peer link as a trunk portFCreate port channels and vPCsGDefine port channel load-balancing methodHMake sure configurations are consistent
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单选题The ONS 15216 is a 32-channel system. The ONS 15216 OADMs are capable of adding and dropping one， two， or four channels. How are the OADMs provisioned to add and drop specific channels？（）A
The ONS 15216 OADM can be provisioned to add/drop one， two， or four channels via Cisco Transport Manager （CTM）.B
The ONS 15216 OADM consists only of a four-channel module， and the number of ports utilized determines whether it is a one， two， or four channel OADM.C
Three separate OADM modules are available for one， two， and four channels. The wavelengths to be dropped and added are programmable via Cisco Transport Manager （CTM）.D
The ONS 15216 OADM consists only of a single-channel module. Two-channel and four-channel support is available by stacking the single-channel module.E
The ONS 15216 OADM is available in one， two， four channels. There are 32 single-channel OADM modules， 16 two-channel OADM modules， and 8 four-channel OADM modules.
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单选题Which of the following describes the difference between SATA and PATA？（）A
SATA operates on a single channel.B
PATA devices have three channels.C
PATA devices have their own channel whereas SATA does not.D
SATA devices have their own channel whereas PATA does not.
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单选题You are making a telephone call ship-to-shore using the VHF-FM service.You can tell that the working channel is busy if you hear（）.A
SpeechB
Signaling tonesC
A busy signalD
All of the above
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