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Mr. Dubey • 52.26K Points
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Q. In OSPF database descriptor packet, which field is used to detect a missing packet?

(A) lsa header
(B) ms
(C) database descriptor sequence number
(D) options
Correct : Option (C)

Explanation: 
 sequence number field is used to detect a missing packet. the packets are to be received in order of the sequence number, so if the receiver detects that there is a sequence number skipped or missing in the order, it stops processing the further received packets and informs the sender to retransmit the packets in sequence.

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