solve in steps please and explain

parties is not required. b-A communication network with 4 intermediate nodes transferring messages with S600 bis in length. The data rate on all links is 6800 bps, with packet size 960 bits and 42 bits as a header The set-up time is 0.2 sec., and the processing time at each node is 0.15, while the average distance is 80 km. Compare between the end-to-end delay of the circuit switching, and the virtual queuing delay at each node is 0.035 sec. The data speed over a link is 100 m/m. sec. and the link circuit switching networks using a mini packet of 50 bits. parties is not required. b-A communication network with 4 intermediate nodes transferring messages with S600 bis in length. The data rate on all links is 6800 bps, with packet size 960 bits and 42 bits as a header The set-up time is 0.2 sec., and the processing time at each node is 0.15, while the average distance is 80 km. Compare between the end-to-end delay of the circuit switching, and the virtual queuing delay at each node is 0.035 sec. The data speed over a link is 100 m/m. sec. and the link circuit switching networks using a mini packet of 50 bits