Need help!

Consider an example scenario where you want to send some merchandise to your friend living in another city (the kind of friend and the kind of merchandise doesn't matter). You need to answer the following questions:

Example: For instance, we can have local post offices, regional post offices and some global delivery services. Their contracts are based on the amount of merchandise they send and receive.

d) Where the layers would be implemented (end-system, packet switches or both)? Discuss how the intermediate systems would process the parcels from source to destination? Again, make reasonable assumptions.

e) At the application layer, what are the things we can do to our merchandise? Should we use some protocol? Would this protocol be only implemented at the sender side?

f) In reference to the transport layer, we have TCP and UDP on the internet. Relate the basic services provided by them to our example. Which protocol should we use?

g) Explain and relate the concepts of IP addresses, MAC addresses, Sockets, Port numbers and Processes with our example scenario.

h) You need to explain and relate the application architectures, Client Server and the Peer-to-Peer for the merchandise delivery. Make reasonable assumptions where needed.