For this question, let the packet size L = 1000 bytes, the propagation speed s =...

 

Transcribed Image Text:

For this question, let the packet size L = 1000 bytes, the propagation speed s = 2.5 x 108 m/s, the link distance d = 2000 km, and the transmission rate R = 10 Mbps. For circuit switching, the setup time is 5 ms, and each link supports 10 circuits. One of the factors that needs to be considered is the setup time for the circuit (being the time for each switch to connect the correct inbound and outbound circuits). In this case the setup time provided is for the complete circuit to be formed and can be included in the total delay as a single factor. Assume that 1 Mbyte (megabyte) = 1 x 106 bytes (SI definition). Be mindful of units. Answer these questions: Question 3 (a) How many simultaneous users can be on one link in a circuit switched network? (1 mark) (b) Assume we have 3 switches connected in a triangle. What is the maximum number of connections supported on this network with circuit-switching (keeping in mind that that each link supports a limited number of circuits, whereas the switches are limited only by the total number of available links)? (1 mark) (c) Given a file size of 1 MB, how long does it take to send it from one host to another over 4 circuit switched links? (2 marks) (d) Given the same file of 1 MB, how long does it take to send it between two hosts that are connected with 4 datagram, packet switched links where the switches use store-and-forward? In a packet switched network, data needs to be encapsulated (information regarding addressing) needs to be added. Assume each packet has a header size of 50 bytes in addition to its data payload of 1000 bytes. (3 marks) (e) How long does it take to transfer the 1 MB file if store-and-forward is not used (assume that packet can flow through the switch without delay)? (1 mark) For this question, let the packet size L = 1000 bytes, the propagation speed s = 2.5 x 108 m/s, the link distance d = 2000 km, and the transmission rate R = 10 Mbps. For circuit switching, the setup time is 5 ms, and each link supports 10 circuits. One of the factors that needs to be considered is the setup time for the circuit (being the time for each switch to connect the correct inbound and outbound circuits). In this case the setup time provided is for the complete circuit to be formed and can be included in the total delay as a single factor. Assume that 1 Mbyte (megabyte) = 1 x 106 bytes (SI definition). Be mindful of units. Answer these questions: Question 3 (a) How many simultaneous users can be on one link in a circuit switched network? (1 mark) (b) Assume we have 3 switches connected in a triangle. What is the maximum number of connections supported on this network with circuit-switching (keeping in mind that that each link supports a limited number of circuits, whereas the switches are limited only by the total number of available links)? (1 mark) (c) Given a file size of 1 MB, how long does it take to send it from one host to another over 4 circuit switched links? (2 marks) (d) Given the same file of 1 MB, how long does it take to send it between two hosts that are connected with 4 datagram, packet switched links where the switches use store-and-forward? In a packet switched network, data needs to be encapsulated (information regarding addressing) needs to be added. Assume each packet has a header size of 50 bytes in addition to its data payload of 1000 bytes. (3 marks) (e) How long does it take to transfer the 1 MB file if store-and-forward is not used (assume that packet can flow through the switch without delay)? (1 mark)