單項選擇題When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?()

A.Set the encapsulation of the interface to HDLC
B.Place the CSU/DSU in local-loop mode
C.Enable local-loop mode on the DCE Frame Relay router
D.Verify that the encapsulation is set to Frame Relay


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4.單項選擇題數(shù)據(jù)分段是OSI七層模型中的()完成的

A.物理層
B.網(wǎng)絡(luò)層
C.傳輸層
D.接入層
E.分發(fā)層
F.數(shù)據(jù)鏈路層

5.單項選擇題ISDN的物理線路是()。

A.2B+D
B.30B+D
C.同軸電纜
D.普通電纜

6.單項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間?()

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

7.單項選擇題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

8.單項選擇題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

9.單項選擇題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

10.單項選擇題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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