[单选题]OSPF在同一区域内，下列说法正确的是（）

正确答案 ：B

每台路由器的LSDB(链路状态数据库)都是相同的

[单选题]常见的LSA有几种类型()

正确答案 ：C

6

[单选题]At which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?

正确答案 ：D

Data link

解析：解析：Explanation:

[单选题]Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?

正确答案 ：C

255.255.254.0

解析：解析：Explanation:

[单选题]Ezonexam has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?

正确答案 ：B

VTP will allow switches to share VLAN configuration information

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