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單項選擇題Which protocols are found in the network layer of the OSI reference model and are responsible for path determination and traffic switching?（）

A.LAN
B.routing
C.WAN
D.network

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1.單項選擇題Which IPV6 routing protocol uses multicast group FF02：：8 to send updates？（）

A.RIPng
B.OSPFv3
C.IS-IS for IPv6
D.static

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2.單項選擇題Data transfer is slow between the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintaineD.To fix this issue, at which layer should the troubleshooting process begin?（）

A.presentation
B.session
C.transport
D.network
E.physical

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3.單項選擇題Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?（）

A.transport
B.network
C.presentation
D.session
E.application

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4.單項選擇題A company implements video conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails completely. What is the most likely reason for this?（）

A.minimum cell rate (MCR)
B.quality of service (QoS)
C.modulation
D.packet switching exchange (PSE)
E.reliable transport protocol (RTP)

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5.單項選擇題指定邏輯通道備份主接口使用的命令是（）。

A.standby logic-channel logic-channel-number [priority]
B.standby nterface interface-type interface-number
C.logic-channel logic-channel-number
D.dialer map protocol next-hop-address dialer-string[logic-channel logic-channel-number]

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