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單項選擇題為了查看Quidway路由器搭建的幀中繼網絡的封裝類型，應啟用什么命令？（）

A.display fr map-info（顯示映射表）
B.display fr pvc-info（PVC統(tǒng)計信息）
C.display fr lmi-info
D.display interface

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1.單項選擇題 Refer to the exhibit. What does the (*) represent in the output?（）

A.Packet is destined for a local interface to the router.
B.Packet was translated, but no response was received from the distant device.
C.Packet was not translated, because no additional ports are available.
D.Packet was translated and fast switched to the destination.

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2.單項選擇題A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port（）。

A.This is a 10 Mb/s switch port
B.This is a 100 Mb/s switch port
C.This is an Ethernet port operating at half duplex
D.This is an Ethernet port operating at full duplex
E. This is a port on a network interface card in a PC

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3.單項選擇題 Refer to the exhibit. The user at Workstation B reports that Server A cannot be reacheD.What ispreventing Workstation B from reaching Server A?（）

A.The IP address for Server A is a broadcast address.
B.The IP address for Workstation B is a subnet address.
C.The gateway for Workstation B is not on the same subnet.
D.The gateway for Server A is not on the same subnet.

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4.多項選擇題下面對我國廣泛使用的DDN網絡描述正確的是什么？（）

A.DDN線路使用簡便，覆蓋面廣
B.DDN專線是點到點的鏈路，它給予用戶訪問整個鏈路帶寬的可能性
C.DDN相對于分組交換網絡來說，線路費用較高
D.DDN專線被廣泛用于企業(yè)網互連，專線internet接入

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5.多項選擇題下列所描述的協(xié)議哪些屬于OSI參考模型表示層協(xié)議（）。

A.ASCII、EBCDIC
B.IP、ARP
C.MAC、LLC
D.MPEG、MIDI
E.NFS、SQL
F.PICT、MPEG

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