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单项选择题IS - IS creates and maintains adjacencies and neighbor relations by using the Hello protocol. For the following options, which are Hello packets  used in IS - IS?()

A、A generic Hello

B、Point - to - point Level 1, point - to -point Level 2, LAN Level 1, LAN Level 2

C、Point - to - point Level 1, point - to - point Level 2, LAN

D、Point - to - point, LAN Level 1, LAN Level 2

  • D
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