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