please answer this asap

Question 2 (2points): A new architecture, with N layers, is proposed. User application at the top layer generates a message of M bytes. At each layer, an H bytes header is added. The second layer of that architecture also adds T bytes trailer. In this architecture, the message M is not divided into smaller packets at any layer. What is the size of the final message (in bytes) transferred by the lower layer? If we consider the headers and trailers to be an overhead, what is the percentage of such overhead to the total size of the final message? Question 3 (1point): Two powerful machines (in terms of capacity, memory and processing power) are sending and receiving data. Can we still run into a congestion problem? (mention yes or no with explanation to answer how?)