Answer the given problems regarding the basics of computer networks and Internet.

problem 1: What are the fundamental tasks of a communications system?

problem 2: What are the basic challenges to enhance communications systems?

problem 3: Think about the OSI reference model and the 5-layer Internet reference model.

Identify what is different between such two models.

problem 4: In 5-layer Internet reference model which layers handle point-to-point functions and which layers handle end-to-end functions?

problem 5: Is sockets a protocol or interface? Carefully describe why.

problem 6: What problems do Information Theory and Coding Theory address? In what department are these areas in general studied?