Which type of attack is characterized ...

单项选择题Which type of attack is characterized by a flood of packets that are requesting a TCP connection to a server（）。

A.denial of service
B.brute force
C.reconnaissance
D.Trojan horse

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1.单项选择题V．24接口工作在同步方式下最高传输速率是（）。

A.64000 bps
B.115200 bps
C.2048000 bps
D.4096000 bps

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2.单项选择题The network administrator is asked to configure 113 point-to-point links. Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses？（）

A.10.10.0.0/18 subnetted with mask 255.255.255.252
B.10.10.0.0/25 subnetted with mask 255.255.255.252
C.10.10.0.0/24 subnetted with mask 255.255.255.252
D.10.10.0.0/23 subnetted with mask 255.255.255.252
E.10.10.0.0/16 subnetted with mask 255.255.255.252

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3.判断题X.25作为国际通用标准的广域网协议，内置的差错纠正，流量控制和丢包重传机制使之具有高度的可靠性，由于数据吞吐率很低，包时延较大，故不适于在质量差的信道上传输数据。

参考答案：错

4.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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5.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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6.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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7.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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8.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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9.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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10.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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