tcp ip basics

2020-11-12 本文已影响0人 landon30

TCP

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Ordered data transfer — the destination host rearranges according to sequence number
Retransmission of lost packets — any cumulative stream not acknowledged is retransmitted
Error-free data transfer
Flow control — limits the rate a sender transfers data to guarantee reliable delivery. The receiver continually hints the sender on how much data can be received (controlled by the sliding window). When the receiving host's buffer fills, the next acknowledgment contains a 0 in the window size, to stop transfer and allow the data in the buffer to be processed.
Congestion control

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Connection based
Guaranteed reliable and ordered
Automatically breaks up your data into packets for you
Makes sure it doesn’t send data too fast for the internet connection to handle (flow control)
Easy to use, you just read and write data like its a file

Easy to use, you just read and write data like its a file
No guarantee of reliability or ordering of packets, they may arrive out of order, be duplicated, or not arrive at all!
You have to manually break your data up into packets and send them
You have to make sure you don’t send data too fast for your internet connection to handle
If a packet is lost, you need to devise some way to detect this, and resend that data if necessary