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If two host are connected by a link and in middle of the link there is a switch between them, then transmission and propagation time both doubled.

But if for the same link, there is no switch between that two hosts, then propagation time and transmission time will be once

Why that happens? Though both are operating on same link, why only a switch doubles propagation delay and transmission delay time?

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IN QUESTION THEY SPECIFIED ABOUT PROPAGATION TIME FOR WHOLE LINK OR INDIVIDUAL LINK. IF THEY GIVE PROPAGATION TIME OF INDIVIDUAL LINK THEN PROPAGATION TIME DOUBLE IN CASE OF SWITCH BETWEEN THEM. OTHERWISE IT WILL BE PT REMAIN.

BUT TRANSMISSION TIME IS ALWAYS DOUBLED BECAUSE TRANSMISSION TIME IS THE TIME TO PUT DATA ON CABLE.

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