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单选题
What kind of packets does OSPF send to keep up connectivity with its neighboring routers?（）
A
SPF packets
B
hello packets
C
keepalive packets
D
dead interval packets
E
LSU packets
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考题
单选题What kind of packets does OSPF send to keep up connectivity with its neighboring routers?（）A
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考题
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考题
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a single hostB
a subset of hostsC
all hosts sequentiallyD
all hosts simultaneously
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