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Which IS-IS PDU is used to request a retransmission of a missing link-state packet?

Which IS-IS PDU is used to request a retransmission of a missing link-state packet?
A . the complete sequence number PDU
B . the partial sequence number PDU
C . a hello PDU with a request PDU TLV specifying the missing LSP
D . a hello PDU with a refresh PDU TLV requesting all LSPs

Answer: B

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