[多选题]Ezonexam is migrating to a private IP addressing scheme. Which of the following describe the use of private IP addresses? (Choose two)

正确答案 ：BD

Addresses that cannot be routed through the public Internet.

A scheme to conserve public addresses.

解析：解析：Explanation:

[单选题]以下特殊区域中哪一个没有自动下发缺省路由（）

正确答案 ：D

完全NSSA区域

[单选题]介质工作在OSI的哪一层（）

正确答案 ：A

物理层

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