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单选题
OSPF作为一个应用层协议，其运行在（）.
A
UDP上，Port Number 520
B
TCP上，Port Number 179
C
IP上，Protocol Number 89
D
直接运行数据链路层之上
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考题
单选题OSPF作为一个应用层协议，其运行在（）.A
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单选题Each lifebuoy shall be marked in block capitals of the Roman alphabet with（）of the ship.A
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单选题What is the port number of an IPsec Encapsulating Security Payfoad packet？（）A
UOP port 50B
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单选题What is the port number of an IPsec Encapsulating Security Payload packet？（）A
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单选题What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-treetopology?（）A
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BGP邻居关系建立在TCP会话基础之上的B
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the forward boat on the starboard sideB
behind boat number 1 on the port sideC
behind boat number 1 on the starboard sideD
behind boat number 2 on the port side
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