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單項(xiàng)選擇題下列哪一條命令用于配置DCC的鏈路處于斷開狀態(tài)后，重新建立鏈接等待的時(shí)間？（）

A.dialer time ridle
B.dialer time rcompete
C.dialer time renable
D.dialer time rwait-carrier

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1.單項(xiàng)選擇題A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these ports?（）

A.Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command
B.Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command
C.Use the switchport port-security MAC address sticky command on all the switch ports that have end devices connected to them
D.Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security

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2.單項(xiàng)選擇題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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3.單項(xiàng)選擇題V．24接口工作在同步方式下最高傳輸速率是（）。

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

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4.單項(xiàng)選擇題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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5.判斷題X.25作為國際通用標(biāo)準(zhǔn)的廣域網(wǎng)協(xié)議，內(nèi)置的差錯(cuò)糾正，流量控制和丟包重傳機(jī)制使之具有高度的可靠性，由于數(shù)據(jù)吞吐率很低，包時(shí)延較大，故不適于在質(zhì)量差的信道上傳輸數(shù)據(jù)。

參考答案：錯(cuò)