单选题OSPF作为一个应用层协议，其运行在（）.AUDP上，Port Number 520BTCP上，Port Number 179CIP上，Protocol Number 89D直接运行数据链路层之上
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
参考解析
解析：
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