Topic : Computering Networking Topic : Computering Networking Topic : Computering Networking

In Part D , x = 6

Topic : Computering Networking Topic : Computering Networking Topic : Computering Networking

Suppose you send a 24-bit photo with resolution of 1,024720 to your friend at 23km away. The channel data rate is 1Gbps and the propagation speed is 2.5108ms1. (a) What is the size of the photo in terms of bytes? (5%) (b) The photo is divided into frames before sending out at the data-link layer. Assume each frame carries 1,500 bits of data plus 40 bits of overhead (header + trailer). How many frames will be sent? What is the size of the last frame? (7%) (c) Suppose Stop-and-Wait ARQ protocol is used. Assume all the frames arrive successfully, the last frame is aligned with the frame size using zero padding and the ACK size is 80 bits. What is the total time required to send the photo? (8%) (d) Continue from part (c). Assume there are (5+x) frames lost in every 50 data frames sent, where x is the 8th digit of your student ID number. Further assume that there is no loss if less than 50 frames are sent, and the last frame is not lost. What is the total time required to send this photo if the timeout value is 200s ? (10%)