单选题What is the OSPF default frequency,in seconds,at which a cisco router sends hello packets on a multi-access network?（）A10B40C30D20
单选题
What is the OSPF default frequency,in seconds,at which a cisco router sends hello packets on a multi-access network?（）
A
10
B
40
C
30
D
20
参考解析
解析：
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