3. (O) (4+2] What are the various packet delays in computer network? Which delays are constant and which are variable? (n) [2+2] Define traffic intensity. What happens if the traffic intensity is greater than 1? (iii) [10] Consider a packet of 1500 bytes that begins at host A and travels over three links over destination host B, using the packet switching technique. The specification of the links are as follows: Communication link 1: Length = 5000 km Propagation speed 2.5 i 10 m/s Transmission rate = 1 Mbps Communication link 2: Length - 4000 km Propagation speed = 210 m/s Transmission rate = 1.5 Mbps Page 1 of 2 Communication link 3: Length 1000 km Propagation speed 3 10 m/s Transmission rate 2 Mbps The processing delay for each packet switch is 3 msec. Assuming that there is no queueing delay in the network. What is the end-to-end delay for a packet from A to B