[单选题]NAT可以被用于完成多种功能，以下不属于其功能的是：（）

正确答案 ：D

内部网络流量控制

[单选题]关于静态NAT，下面（）说法是正确的。

正确答案 ：C

静态NAT将内部地址一对一静态映射到内部全局地址

[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]交换机工作在OSI七层模型的哪一层()

正确答案 ：B

数据链路层

[单选题]RIP路由协议认为“网络不可到达”的跳数是：()

正确答案 ：B

16

[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]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:

[多选题]You are bringing up a new Ezonexam switch, and wish to connect it via a trunk to another switch from a different vendor, which uses the IEEE standard for the trunking method. When setting the encapsulation type on the trunk, what should you configure on the Cisco switch?

正确答案 ：ABCDE

Switch(config) switchport trunk encapsulation isl

Switch(config) switchport trunk encapsulation ietf

Switch(config-if) switchport trunk encapsulation isl

Switch(config-if) switchport trunk encapsulation ietf

Switch(config-if) switchport trunk encapsulation dot1q

解析：解析：Explanation:

[多选题]Two stations on the Ezonexam LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network? (Choose all that apply)

正确答案 ：BDE

A jam signal informs all devices that a collision occurred.

The devices that are involved in the collision stops transmitting for a short time.

The collision invokes a random back-off algorithm.

解析：解析：Explanation:

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