Exercise 2 (30 points) a) (20 points) A system has an k-layer protocol hierarchy. Applications generate messages of length m bytes. At each of the layers, an n-byte header is added. What fraction of the network bandwidth is filled with headers? The fraction f is equal the total number of bytes of all headers over the total number of bytes sent out by a sender. i. (10 points) Draw the full message with all headers ii. (10 points). Derive the fraction f