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PTN指的是Packet Transport Network（分组传送网络）。
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You are the Cisco Network Designer in Cisco.com. Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual ring topology?（）A、DynamicTrunking ProtocolB、Resilient Packet RingC、Synchronous Digital HierarchyD、Coarse Wave Division Multiplexing
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多选题Part of the job as a network administrator is being able to make a distinction between routed protocols and routing protocols. Which of the following statements is true regarding them?（）AA routing protocol is assigned to an interface and determines the method of packet delivery.BA routed protocol is assigned to an interface and determines the method of packet delivery.CA routing protocol determines the path of a packet through a network.DA routed protocol determines the path of a packet through a network.EA routing protocol operates at the transport layer of the OSI model.FA routed protocol updates the routing table of a router.
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单选题What is a static packet-filtering firewall used for ？（）A
It validates the fact that a packet is either a connection request or a data packet belonging to a connectionB
It evaluates network packets for valid data at the application layer before allowing connectionsC
It analyzes network traffic at the network and transport protocol layersD
It keeps track of the actual communication process through the use of a state table
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多选题Which of the following statements regarding routed and routing protocols are true?（）AA routed protocol is assigned to an interface and determines the method of packet deliver.BA routing protocol determines the path of a packet through a network.CA routed protocol determines the path of a packet through a network.DA routing protocol operates at the transport layer of the OSI model.EA routed protocol updates the routing table of a router.
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单选题You are the Cisco Network Designer in Cisco.com. Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual ringtopology？（）A
Dynamic Trunking ProtocolB
Resilient Packet RingC
Synchronous Digital HierarchyD
Coarse Wave Division Multiplexing
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