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which are Hello packets used in IS-IS?

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?

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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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