3.5-3 TCP sequence numbers and ACKS (1). Consider the TCP Telnet scenario below (from Fig. 3.31 in text). Why is it that the receiver sends and ACK that is one larger than the sequence number in the received datagram? Host A Host B User types 'c' Sed 42, ACK=79, 4 data = 'c'| host ACKS receipt of 'C', echoes back 'c' Seq=79, ACK 43, data = 'c' host ACKS receipt of echoed 'C' Seq=43, ACK=80 simple telnet scenario Because TCP sequence numbers always increase by 1, with every new segment, and the TCP receiver always send the sequence number of the next expected segment Because the send-to receiver segment carries only one byte of data, and after that segment is received, the next expected byte of data is just the next byte (i.e., has an index that is one larger) in the data stream.
3.5-3 TCP sequence numbers and ACKS (1). Consider the TCP Telnet scenario below (from Fig. 3.31 in text). Why is it that the receiver sends and ACK that is one larger than the sequence number in the received datagram? Host A Host B User types 'c' Sed 42, ACK=79, 4 data = 'c'| host ACKS receipt of 'C', echoes back 'c' Seq=79, ACK 43, data = 'c' host ACKS receipt of echoed 'C' Seq=43, ACK=80 simple telnet scenario Because TCP sequence numbers always increase by 1, with every new segment, and the TCP receiver always send the sequence number of the next expected segment Because the send-to receiver segment carries only one byte of data, and after that segment is received, the next expected byte of data is just the next byte (i.e., has an index that is one larger) in the data stream.
Chapter9: Computer Networks
Section: Chapter Questions
Problem 10VE
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3.5-3 TCP sequence numbers and ACKs (1). Consider the TCP Telnet scenario below (from Fig. 3.31 in text). Why is it that the receiver sends and ACK that is one larger than the sequence number in the received datagram?
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