[单选题]TCP23是（）协议端口号；UDP69是（）端口号；TCP80是（）端口号。

正确答案 ：C

TELNET TFTP HTTP

[单选题]At which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?

正确答案 ：D

Data link

解析：解析：Explanation:

[单选题]下列对RIP的配置中，合法的命令是（）

正确答案 ：C

router rip network 10.12.0.0

[单选题]默认情况下，RIP定期发送路由更新的时间是（）

正确答案 ：B

30S

[多选题]You need to describe the various types of flow control to your co-workers. Which of the following are types of flow control that can be used in a network? (Choose three)

正确答案 ：ABD

Congestion avoidance

Windowing

Buffering

[单选题]配置路由器特权用户“加密密码”的命令是：()

正确答案 ：C

enable secret

[多选题]The LAN needs are expanding at the Ezonexam corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the Ezonexam network.Which of the following are layer 1 devices that you can use? (Choose all that apply.)

正确答案 ：DE

A hub

A repeater

解析：解析：Explanation:

[单选题]OSPF在同一区域内，下列说法正确的是（）

正确答案 ：B

每台路由器的LSDB(链路状态数据库)都是相同的

[单选题]IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的子网号为（）

正确答案 ：B

192.168.80.64

[单选题]路由器“全局模式”的提示符为（）

正确答案 ：C

(config)

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