1. Assume a five layer networking model. There are 30 bytes of application data. A 2 Byte header is added at the transport layer, a 3 Byte header is added at the internet layer and a 2 Byte header is added at the network interface layer. The network interface layer also adds a 1 Byte trailer.

1. How many total bytes are sent to the physical layer?

2. What percentage of the bytes sent to the physical layer is overhead? (trailers are overhead)

[ Remember: % overhead = ( overhead bytes / total bytes ) * 100% ] you may round