Question 3 (40%) Consider the following transmission scenario, where Host A is going to send a large file of size 100,000 bits to Host B. Host A and Host B are 5 km apart and are directly connected using a dedicated link. The link bandwidth is 500 Mbps (i.e. 5x108 bits-per- second) and propagation speed is 2x108 m/s. Host A IP addr: Large file 192.168.123.21 Port #: 13579 Host B IP addr: 192.168.123.48 Port #: 24680 (a) Do you suggest using TCP or UDP as the transport layer protocol for transmission? Explain your answer. (5 marks) (b) According to your answer in (a), what would be the socket ID at Host A for this transmission? Further consider the settings of the transmission below: - (5 marks) - Stop-and-wait operation is adopted, with maximum packet size of 5000 bits - All control packets (e.g. connect setup, ACK, etc.) have a fix size of 500 bits Overhead due to lower layers (e.g. header) are neglected - Processing delay after receiving a packet / ACK is neglected (c) What is the transmission delay for sending ONE data packet? (5 marks) (d) What is the propagation delay of the link? (5 marks) (e) Calculate the time required for Host A to send ONE data packet until Host A confirms that data packet is correctly received by Host B. (10 marks) (f) The entire process includes (i) connection setup using one round-trip, (ii) data transmission, and (iii) connection tear-down using one round-trip. What is the total time needed for the entire process to complete? (10 marks)