University:
York University
Course:
AP/ITEC 1610 | Introduction to Computer Programming
Academic year:

2023
Views:

92

Pages:

2
Author:

Nick T.

Selective Repeat: Receiver individually acknowledges all correctly received packets. Buffers packets for eventual in-order delivery to the upper layer. Sender times out and retransmits individual packets. TCP Segment Structure: Source Port: Number of the sending process Destination Port: Number of the receiving process Sequence Number: Number of the first byte in the segment Acknowledgment Number: Sequence number of the next byte expected from the other side Header Length: Length of the TCP header (in 4-byte units) Flags: Control bits (e.g., SYN, ACK, FIN, RST, PSH, URG) Receive Window: Maximum number of bytes the receiver can buffer Checksum: Error detection Urgent Pointer: Indicates urgent data Options: Optional fields (e.g., window scaling, timestamp) Data: Data to be transmitted Round Trip Time (RTT): Estimated RTT = (1-α) * Estimated RTT + α * SampleRT α = 0.125 Timeout Interval: Timeout Interval = Estimated RTT + 4 * DevRTT DevRTT = (1-β) * DevRTT + β * |SampleRT - EstimatedRTT| β = 0.25 TCP Fast Retransmit: If the sender receives 3 additional ACKs for the same data, resend the unacknowledged segment with the smallest sequence number.