The Ezonexam network administrator has just issued the "switchport trunk native vlan 998" command on switch VE2. What is the function of this command?

A．It designates VLAN 998 as the default for all unknown tagged traffic

B．It designates VLAN 998 for untagged traffic

C．It blocks VLAN 998 traffic from passing on the trunk

D．It creates a VLAN 998 interface

E．None of the above

CDP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two)

A. To determine the status of network services on a remote device

B. To obtain the IP Address of a connected device in order to telnet to the device

C. To verify the type of cable interconnecting two devices

D. To verify Layer 2 connectivity between two devices when Layer 3 fails

E. To obtain VLAN information from directly connected swticehs

F. To determine the status of the routing protocols between directly connected routers

G. To support automatic network failover during outages

A.On

B.Prevent

C.Passive

D.Auto

E.Active

F.Desirable

R1上执行show ip interface brief命令的输出中显示接口S0/0/0状态码为“up”和“down”，那么以下哪种情况可能属实

A.接口当前配置了shutdown命令

B.R1的串行接口两端协议不同

C.R1的串行接口没有安装串行电缆

D.两台路由器的串行链路，只有一端配置了IP地址

下列哪两项用于在配置OSPF路由进程时确定路由器ID（）

A.第一个快速以太网接口的IP地址

B.任何逻辑接口的最大IP地址

C.任何物理接口的最大IP地址

D.默认网关的IP地址

E.优先级为1的任何物理接口

How can a Ezonexam administrator determine if a router has been configured when it is first powered up?

A．A configured router prompts for a password

B．A configured router goes to the privileged mode prompt

C．An un configured router goes into the setup dialog

D．An un configured router goes to the enable mode prompt

地址转换NAT的优点是()

A.地址转换对于报文内容中含有有用的地址信息的情况很难处理

B.地址转换可以缓解地地址短缺的问题

C.地址转换不能处理IP报头加密的情况

D.地址转换由于隐藏了内部主机地址，有时会使网络调试变得复杂