What is the difference between a CSU/D...

单项选择题What is the difference between a CSU/DSU and a modem?（）

A.A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line
B.A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line
C.A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line
D.A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line

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1.单项选择题配置备份中心的目的是（）。

A.增加网络带宽
B.提高网络可用性
C.降低网络传输费用
D.防止数据传输意外中止

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2.多项选择题路由器作为网络互连设备，必须具备以下哪些特点？（）

A.支持路由协议
B.至少具备一个备份口
C.到少支持两个网络接口
D.协议至少要实现到网络层
E.具有存储、转发和寻径功能
F.至少支持两种以上的子网协议

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3.多项选择题关于MAC地址表示正确的是（）。

A.00-e0-fe-01-23-45
B.00e0.fe01.2345
C.00e.0fe.-012.345
D.00e0.fe112345

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4.单项选择题The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command（）。

A.This command should be executed from the global configuration mode
B.The IP address 10.121.16.8 is the local router port used to forward data
C.102 is the remote DLCI that will receive the information
D.This command is required for all Frame Relay configurations
E.The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC

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5.多项选择题Which three options are valid WAN connectivity methods? （）

A.PPP
B.WAP
C.HDLC
D.MPLS
E.L2TPv3
F.ATM

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6.单项选择题How should a router that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates（）。

A.Configure a separate sub-interface for each PVC with a unique DLCI and subnet assigned to the sub-interface
B.Configure each Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic
C.Configure many sub-interfaces on the same subnet
D.Configure a single sub-interface to establish multiple PVC connections to multiple remote router interfaces

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7.单项选择题Which command reveals the last method used to powercycle a router?（）

A.show reload
B.show boot
C.show running-config
D.show version

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8.单项选择题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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9.单项选择题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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10.单项选择题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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