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【单选题】

What is periodically sent by a DIS on a LAN to ensure that all adjacent neighbors' IS - IS link - state databases are synchronized?()

A、complete SNP (CSNP)

B、partial SNP (PSNP)

C、database query

D、database description packet (DDP)

E、link - state summary

F、hello

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第1题

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第2题

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第4题

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第8题

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第9题

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