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单选题
What is the OSPF default frequency,in seconds,at which a cisco router sends hello packets on a multiaccess network?（）
A
10
B
40
C
30
D
20
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单选题What is the default routing update period for RIPv2?（）A
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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
10B
40C
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