A. A system has an n-layer protocol hierarchy. Applications generate messages of length M bytes. At each layer, an h-bytes header is added. What fraction of the networks bandwidth is filled with headers? (1 point) B. When a file is transfered between two computers, two acknowledgement strategies are possible. In the first one, the file is chopped up into packets which are individually acknowledged by the receiver, but the file transfer as a whole is not ackmowledged. In the second one, the packets are not acknowledged individualy, but the entire file is acknowledged when it amives. Compare the two approaches. (l point) C. Explain the specifications (or characteristics) of IP adresses (length, classes, mask IP D. In the OSI layered model, which level do you associate to a switch? Justify why a switch E. While P addresses are tied to specific networks, Ethemet addresses are not. Give a F. Suppose that an 11 Mbps 802.11b LAN is transmitting 64-byte frames back-to-back over address typesetting...(Al point) is related to that layer. (1 point) reason why they are not. (2 points) a radio channel with a bit eror rate of 10" How many frames per second will te damaged on average? (2 points) G. A wireless LAN with one AP (access pount) has 10 clieat stations. Four stations have data rates of 6 Mbps, four stations have data rates of 18 Mbps, and the last two stations have data rates of 54 Mbps. If all stations have the same for transmission what is the LAN's data rate average? (2 points)