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单选题
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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考题
单选题What is the recommended practice regarding UDLD when implementing it in all fiber-optic LAN ports?（）A
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