The network administrator has configured port security on a

【名词&注释】

路由表(routing table)、路由器(router)、物理层(physical layer)、网络流量控制(network traffic control)

[单选题]The network administrator has configured port security on a Ezonexam switch. Why would a network administrator configure port security on this Ezonexam device?

A. To prevent unauthorized hosts from getting access to the LAN
B. To limit the number of Layer 2 broadcasts on a particular switch port
C. To prevent unauthorized Telnet or SSH access to a switch port
D. To prevent the IP and MAC address of the switch and associated ports
E. None of the above

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[多选题]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. F. To determine the status of the routing protocols between directly connected routers
G. G. To support automatic network failover during outages

[单选题]下列哪个network命令会告知此路由器开始使用IP地址为10.1.1.1、10.1.100.1和10.1.120.1的接口上的OSPF（）

A. network 10.0.0.0 255.0.0.0 area 0
B. network 10.0.0.0 0.255.255.255 area 0
C. network 10.0.0.1 0.0.0.255 area 0
D. network 10.0.0.1 0.0.255.255 area 0

[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：（）

A. 转换内部局部地址
B. 内部全局地址复用
C. TCP负载均衡
D. 内部网络流量控制^{(network traffic control)}

[单选题]OSI七层模型中，物理层的数据封装名称为（）

A. 比特
B. 帧
C. 包
D. 段

[单选题]路由器上激活端口的命令是（）

A. shutdown
B. no shutdown
C. up
D. noup

[单选题]路由表中，某条路由的“路由代码为D”，则表明该路由为（）

A. 直连路由
B. 静态路由
C. IGRP路由
D. EIGRP路由

[多选题]Regarding the extended ping command; which of the statements below are true?(Select all valid answer choices)

A. The extended ping command is supported from user EXEC mode.
B. The extended ping command is available from privileged EXEC mode.
C. With the extended ping command you can specify the TCP and UDP port to be pinged.
D. With the extended ping command you can specify the timeout value.
E. With the extended ping command you can specify the datagram size.

[单选题]After connecting a PC to an available port on a switch, you find that the PC can not access any of the resources on the LAN. No other PC's connected to the switch appear to be having any issues. What is the most likely cause for this problem?

A. The router lacks a routing table entry for the new host
B. The host switch port is assigned to the incorrect VLAN
C. The host MAC address is incorrectly configured
D. A STP instance for the new host has not been initialized
E. The switch does not have the MAC address hard coded in the CAM table.

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