10. You send a message "Hi to your friend over a popular instant messaging service. Suppose this message goes over to the service's server after crossing two routers and a link-layer 2 switch. (a) (3 points) Complete the following picture: Application Transport Network Link Physical source Application Transport Network Link Physical switch destination T T UZ > A T N N L Uz - router P P router (b) (2 points) The message "Hi needs 2 bytes. Suppose, application layer headers are 10 bytes, transport layer headers are 20bytes, network headers are 20 bytes, link layer headers are 18 bytes. How many bytes is the destination going to receive? (c) (2 points) If messages are end-to-end encrypted, the 2 byte "Hi" will be encrypted to a 1024 byte message. What is the goodput at the destination? (Goodput = useful bytes/total bytes received)