You say "bye" first! - no, you say "bye" first! - how do you know when to close the connection? Dr Richard G. Clegg of Queen Mary University London talks us through this frustrating network problem.
nb As some eagle-eyed commenters have spotted, Richard meant to say FIN FIN/ACK ACK for the shut down sequence.
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This video was filmed and edited by Sean Riley.
Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com
