Câu 6: 4A0-100: Alcatel-Lucent Scalable IP Networks

TCP is sending data in 5 segments with SEQ numbers 27000, 27500.28000, 28500, and 29000 respectively. During transmission, the segment with SEQ=28500 is dropped in the network. How does TCP handle this situation?

1. A. The receiving end station sends an ACK flag with SEQ=28000 to indicate it has received a segment out of order. — đáp án hiện tại
2. B. The receiving station sends a NACK frame with SEQ=28500 requesting that the frame be retransmitted
3. C. Once the reciever's window is full. TCP assembles the payload and determines that SEQ=28500 is missing. At this point, the reciever sends the RST flag with SEQ=28500 to Request Single Transmission of the missing segment.
4. D. TCP will collect the segments and forward them to the application layer where the SEQ numbers will be processed and a retransmit request will occur for the entire packet.