正确答案: A

To prevent unauthorized hosts from getting access to the LAN

题目：The network administrator has configured port security on a Ezonexam switch. Why would a network administrator configure port security on this Ezonexam device?

解析：解析：Explanation:

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举一反三的答案和解析：

[单选题]What is the purpose of the Spanning Tree Protocol (STP)?

To maintain a loop-free Layer 2 network topology

解析：解析：Explanation:

[多选题]默认情况下，IGRP衡量路径好坏时，考虑的因素为（）

带宽

延时

解析：AD

[单选题]FTP工作在OSI哪一层（）

应用层

[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)

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

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

[单选题]路由器“特权模式”的提示符是：（）

[多选题]You need to configure an 802.1Q link on a Ezonexam switch. Which commands, when used together, would do this? (Select two answer choices)

Switch(config-if) switchport mode trunk

Switch(config-if) switchport trunk encapsulation dot1q

解析：C,D 解析：Explanation:

[单选题]对于使用链路状态路由协议的路由器如何选择最佳路线到达子网，下列哪项是正确的（）

通过针对链路状态数据库中的信息运行SPF算法，路由器会计算出最佳路由

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

The extended ping command is available from privileged EXEC mode.

With the extended ping command you can specify the timeout value.

With the extended ping command you can specify the datagram size.

解析：解析：Explanation: