(a) Analyze the reason for the increase in transmission and propagation time in datagram network with useful diagram. [2 marks] (b) Justify how many bits, if any, is required as padding to transmit 75 bytes IP packet over Ethernet. [2 marks] (c) Refer to Table Q2(c). Table Q2(c) (i) Determine the transmitted bits using Cyclic Redundancy Check (CRC) method with the generator polynomial as in Table Q2(c). [4 marks] (ii) Imagine an error occurred during transmission where the THIRD BIT from the Most Significant Bit (MSB). Prove if the receiver is able to detect this error. UNIVERSITI TEKNIKAL MALAYSIA MELAKA [4 marks] (d) (i) A Stop-and-Wait Automatic Repeat Request (ARQ) mechanism has 5ms as its time-out. Sketch the flow diagram of 3 frames where the round-trip delay for each frame is 3ms. Assume both data and ACK frames arrive successfully. [4 marks] (ii) Revise the answer in Q2(d)(i) if the same mechanism now has a 3 ms time-out and 5ms round-trip delay. [5 marks] (iii) Discuss if the ACK for first frame in Q2(d)(i) is lost. Redraw the flow diagram. [4 marks]