Computer Networks · topic
Stop-and-wait, Go-Back-N and Selective Repeat efficiency, windows and sequence-number bits; UDP and TCP headers, the three-way handshake and teardown, byte sequence numbers and ACKs; TCP flow control with the receive window, sequence wrap, RTO estimation, throughput formulas; congestion control with slow start, avoidance, fast retransmit and fast recovery traced round by round.
Error detection tells a receiver that a frame is damaged; it does not get the data through. Automatic repeat request (ARQ) protocols add acknowledgements, timers and retransmission so that every frame is eventually delivered once and in order.
IP delivers datagrams between hosts, unreliably. The transport layer turns this into communication between processes, identified by 16-bit port numbers, and optionally adds reliability.
A TCP receiver places arriving bytes in a receive buffer, from which the application reads them when it chooses. If the sender sends faster than the application reads, the buffer fills and further bytes would be lost.
Flow control stops a sender from overrunning its receiver.
One-page visual sheets for this topic, in the sheet library on the store. Previews are free; the full sheets come with the subject pack.
