[单选题]帧中继环境下，为了区分虚电路，应该使用的地址是（）

正确答案 ：C

DLCI

[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?

正确答案 ：A

To prevent unauthorized hosts from getting access to the LAN

解析：解析：Explanation:

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

正确答案 ：C

An un configured router goes into the setup dialog

解析：解析：Explanation:

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