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How TCP detects drops
The sender puts a
sequence number on
each packet
When the receiver
receives a packet, it send
back an ACK with the
highest contiguous
sequence number it has
received
If the sender receives
duplicate ACKs, it knows
that a packet was
dropped (or that
something was delivered
out of order)
User
5
2 3
1
*
4
Server
(TCP)
data
acknowledgements
2
User
2
1
Server
(TCP)