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简述把关人（gatekeeper）理论。
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更多 “简述把关人（gatekeeper）理论。” 相关考题
考题
WhichIPtelephonydeploymentmodelusesanH.225Gatekeeper－ControlledtrunkforcalladmissioncontrolwithinexistingH.323environments?()
A.singlesitewithcentralizedcallprocessingB.singlesitewithdistributedcallprocessingC.multisitewithcentralizedcallprocessingD.multisitewithdistributedcallprocessing
考题
WhichdeviceisnormallyusedtotranslatetelephonenumbersornamestoIPaddressesforcallroutinginanH.323network?()
A.callagentB.IPphoneC.multipointcontrolunitD.gatekeeper
考题
WhichVoIPcomponentscanpermitordenyacallattemptonthebasisofanetwork’savailablebandwidth?()
A.MCUB.ApplicationserverC.GatewayD.Gatekeeper
考题
Which statement is true about the capabilities of a voice gateway router？（）A、voice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packetsB、voice gateways need a gatekeeper to interconnect the VoIP networks the PSTN networkC、voice gateways with Cisco Unified CallManager Express （CME） can permanently act as a call agent for IP phonesD、voice gateways equipped with a DSP module can take the role of the call agent during WAN failure.
考题
Which VoIP components can permit or deny a call attempt on the basis of a network’s available bandwidth？（）A、MCUB、Application serverC、GatewayD、Gatekeeper
考题
Which device is normally used to translate telephone numbers or names to IP addresses for call routing in an H.323 network？ （）A、call agentB、IP phoneC、multipoint control unitD、gatekeeper
考题
When gateways are registering with a gatekeeper， the gatekeeper can be（）.A、On the same subnetB、On a remote LANC、In a different subnetD、Any of the above
考题
单选题When gateways are registering with a gatekeeper， the gatekeeper can be（）.A
On the same subnetB
On a remote LANC
In a different subnetD
Any of the above
考题
问答题什么是把关人理论？怎样理解网络传播中“把关人理论”的创新？
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