1. Suppose there is exactly one packet switch between a sending host and a receiving host. The transmission rates between the sending host and the switch and between the switch and the receiving host are R1and R2 respectively. Assuming that the switch uses storeandforward packet switching, answer the following questions:

a. Explain what is storeandforward packet switch, and

b. Identify and explain each of the types of delays that should be considered to calculate the total end-toend delay to send a packet of length L.

c. Explain the difference between variable and constant delays, and identify which of the delays described in (b) are constant and which hare variable.