单项选择题

What is periodically multicasted （every 10 seconds） by the DIS on a LAN to ensure IS-IS Link StateDatabase accuracy？（）

A.PSNP
B.CSNP
C.LSP
D.IIH
E.ISH

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CCIE SP

What is periodically multicasted （every 10 seconds） by the DIS on a LAN to ensure IS-IS Link StateDatabase accuracy？（）