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名词解释题
VC（Virtual Circuit）虚电路
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For (71) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (72) for every packet sent. Instead, when a connection is established, a route from the (73)machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (74) That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works. When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (75) telling which virtual circuit it belongs to.A．connectionlessB．connection-orientedC．datagramD．telegram
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Which two of these are characteristics of Metro Ethernet? ()
A. class of serviceB. bandwidth profilesC. user-network interfaceD. Ethernet LAN circuit attributesE. Ethernet virtual circuit attributes
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Which three are optional extensions of the Frame Relay Local Management Interface specification？（）A、switched virtual circuitB、virtual circuit statusC、simple flow controlD、multicastingE、permanent virtual circuit
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What are three physical interface properties?（）A、payload scramblingB、virtual circuit identifierC、FCSD、link speedE、IP address
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在分组交换网中，控制和管理通过网络的交换分组流，有两种方式是（）A、帧（Frame）B、数据报（Datagram）C、虚电路（Virtual.Circuit）D、数据包（packet）
考题
帧中继中，虚电路VC（VirtualCircuit）是建立在两台网络设备之间的逻辑电路。根据建立方式，可以将虚电路分为（）.A、静态虚电路SVC（Static Virtual Circuit）B、临时虚电路TVC（Temporary Virtual Circuit）C、永久虚电路PVC（Permanent Virtual Circuit）D、交换虚电路SVC（Switching Virtual Circuit）
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Which two of these are characteristics of Metro Ethernet? （）A、class of serviceB、bandwidth profilesC、user-network interfaceD、Ethernet LAN circuit attributesE、Ethernet virtual circuit attributes
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Which of the following ATM components are needed to configure an ATM SVC （switched virtual circuit） classical IP interface？（）A、LESB、BUSC、LECSD、ARP server
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单选题For (1) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (2) for every packet sent. Instead,when a connection is established, a route from the(3) machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (4) . That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (5) telling which virtual circuit it belongs to.
空白（3）处应选择（）A
sourceB
routeC
destinationD
host
考题
多选题帧中继中，虚电路VC（VirtualCircuit）是建立在两台网络设备之间的逻辑电路。根据建立方式，可以将虚电路分为（）.A静态虚电路SVC（Static Virtual Circuit）B临时虚电路TVC（Temporary Virtual Circuit）C永久虚电路PVC（Permanent Virtual Circuit）D交换虚电路SVC（Switching Virtual Circuit）
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单选题What is the data encapsulation method for the VPLS virtual circuit （VC）？（）A
MAC over MPLSB
L2TPV3C
802.1 QinQD
Ethernet over MPLSE
GRE
考题
多选题Which two of these are characteristics of Metro Ethernet? （）Aclass of serviceBbandwidth profilesCuser-network interfaceDEthernet LAN circuit attributesEEthernet virtual circuit attributes
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多选题Which three are optional extensions of the Frame Relay Local Management Interface specification？（）Aswitched virtual circuitBvirtual circuit statusCsimple flow controlDmulticastingEpermanent virtual circuit
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多选题（）是分组交换的两种具体形式。A数据报（Datagram）B平面直角管C报文交换D虚电路（Visual Circuit，VC）
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