The TCP handshake
How long does a small request take before one byte of the page has moved - and does a fatter pipe help?
Before any content moves, both ends trade introductions, and each one costs half a trip across the wire and back. The ladder plays those flights one at a time, and the clock counts the milliseconds they spend. Watch how much of the wait lands before the request is even allowed to leave.
Board: TCP Handshake →Three panels stack on a narrow screen; the round-trip dial and the setup tabs stay above them. The two tables scroll sideways.
try this Drag How far away the server is out to the satellite, then press Play next flight and watch The clock.
Included with a plan
This lab is included with a plan. The first three lessons of every track are free, with their boards and videos. A plan unlocks every lesson, board, video, lab and paper for one price.
see also End-to-End Arguments in System Design in Papers.