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[Darkstar3000]

This is my first time doing networking and we've been stuck with an assignment that has me stumped, I've managed to struggle through some of it. I came across this question and I have no idea how to answer it, I haven't come across any relevant resources or information.

Assume  that  the  switching  time  (time  to  store  and  forward  a  packet)  is  10
microseconds. Will that have a significant impact on the application response time
(request response) if the client is located at east cost and the server located at west cost and assuming that the propagation delay in the links between the client and
server  is  approximately  two  thirds  of  the  speed  of  light.  Justify  your  answer.
(assume  east-cost  west-cost  distance  is  5000  km  and  a  speed  of  light  of  200 meters/microsec.)

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Also how does the IP address of a device on the network change if you replace a router with a bridge ?