Question 1 (10p) P6 on page 71 (Continued and Enhanced). Consider two hosts, A and B, connected by single or double switches with link of rate R bps. Suppose that the two hosts are separated by m meters, and suppose the propagation speed along the link is s meters/sec. Host A is to send a packet of size L bits to Host B. (Note: refer to slides p41 and p45.)

1. a) Ignoring processing and queuing delays, obtain an expression of the end-to-end delay TE2E for both single and double switches, respectively. Given that the propagation speed is

2. b) Find the end to end delay for a message of 12,000 bits with packet length of L = 1000 bits and rate R= 10 Mbps for double-switch network. For simplicity, ignore propagation delay.

3. c) Assume that time is slotted into 100s. Draw a snapshot of all packets from time t = 0 to the time that the entiremessage is received for double-switch network. For simplicity, ignore propagation delay.

m -meters Single Switch S1 S2 Double Switches