please explain this

8) Assume that a data segment is sent from a client application on one machine to server application on a second machine over a network that has one intermediate node, a router. Document the series of time delays encountered as the segment travels from one machine to the other. Do this by assigning an identifying character (A, B, C etc) in the figure below to each delay. Then for each A, B, C, etc. name the delay and describe it. monitor & CPU router server keyboard