Johnny just set up a TCP connection with a web server in Chicago, Illinois, claiming he is coming in with a source IP address that clearly belongs to a network in Copenhagen, Denmark. In examining the session logs, you notice that he was able to complete the three way handshake for this connection in 10 milliseconds. How can you use this information to prove Johnny is lying?
What will be an ideal response?
The distance between Chicago, Illinois and Copenhagen, Denmark is roughly
4200 miles. The speed of light is roughly 186,400 miles per second. In order to complete
a three-way handshake, as claimed, messages need to travel from Copenhagen to Chicago
and back, which is at least 8400 miles. At the speed of light, with no delays for routing,
switching, or computing, the fastest that this could be done is 45 milliseconds. So Johnny
must be lying.
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