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Once a TCP
connection has been
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terminated (the
last ACK sent) there is
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some unfinished
business:
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What if the ACK
is lost? The last FIN will
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be resent and it
must be ACK’d.
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What if there are
lost or duplicated
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segments that
finally reach the destination
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after a long
delay?
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TCP hangs out
for a while to handle
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these situations.
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