[单选题]Why might the Ezonexam network administrator set the configuration register to 0x2142 on a 2600 series Cisco router?

正确答案 ：B

To reset the console password

解析：解析：Explanation:

[单选题]路由器当前的模式为“端口模式”，要退回到“特权模式”，应该使用的快捷键为（）

正确答案 ：B

ctrl+z

[单选题]关于OSPF中DR的说法不正确的是（）

正确答案 ：B

如果某路由器优先级比DR优先级高，但启动晚，它会抢占原来的DR自己成为DR

[多选题]When you compare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)

正确答案 ：AD

Half-duplex Ethernet operates in a shared collision domain.

Half-duplex Ethernet has lower effective throughput.

解析：解析：Explanation:

[单选题]The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?

正确答案 ：A

1 network with 254 hosts

解析：解析：Explanation:Asubnetwith24bitsonwouldbe255.255.255.0.SincethisisaclassCnetwork,thissubnetcanhaveonly1networkand254usablehosts.

[单选题]要把交换机的配置文件保存到tftp服务器，应使用的命令为（）

正确答案 ：B

copy running-configt ftp

[单选题]A receiving host has failed to receive all of the segments that it should acknowledge.What can the host do to improve the reliability of this communication session?

正确答案 ：E

Decrease the window size

解析：解析：Explanation:

[单选题]While troubleshooting a connectivity issue from a PC you obtain the following information:Local PC IP address: 190.0.3.35/24

正确答案 ：I

TCP/IP not correctly installed

解析：解析：Explanation:

[单选题]A Ezonexam PC has the IP address 172.16.209.10 /22. What is the subnet of this address?

正确答案 ：C

172.16.208.0

解析：解析：Explanation:

[多选题]Using a subnet mask of 255.255.255.224, which of the IP addresses below can you assign to the hosts on this subnet? (Select all that apply)

正确答案 ：CDE

92.11.178.93

134.178.18.56

192.168.16.87

解析：C,D,E 解析：Explanation:

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