Calculate the effective bandwidth for the following cases. For (a) and (b), assume there is a steady supply of data to send; for (c), simply calculate the average over 12 hours.

(a) 10-Mbps Ethernet through three store-and-forward switches as in Exercise 17(b). Switches can send on one link while receiving on the other.

(b) Same as (a) but with the sender having to wait for a 50-

byte acknowledgment packet after sending each 5000-bit data packet.

(c) Overnight (12-hour) shipment of 100 compact disks (650 MB each).

Exercise 17(b)

Same as (a) but with three switches.

(a)

10-Mbps Ethernet with a single store-and-forward switch in the path and a packet size of 5000 bits. Assume that each link introduces a propagation delay of 10 µs and that the switch begins retransmitting immediately after it has finished receiving the packet.