How long it takes to service the packet?
When output link is free (not busy) and packet enters node (router, switch etc…), it is immediately send to output port. In such scenario, time, which packet spends in node, can be calcutated from following simple formula:
It takes longer to forward packet, if it is large or if output link has low rate.
Of course, this is very optimistic example. In real world packets might be queued, because output link is busy (= forwarding another packet). When packets are queued, service time increases according their place in the queue.
When output link is free (not busy) and packet enters node (router, switch etc…), it is immediately send to output port. In such scenario, time, which packet spends in node, can be calcutated from following simple formula:
Of course, this is very optimistic example. In real world packets might be queued, because output link is busy (= forwarding another packet). When packets are queued, service time increases according their place in the queue.
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