# Homework #6

**No need to submit it, but please do it**

Solve the following problems from the book.

Chapter 3: 60

Chapter 5: 11, 12, 15, 18, 25, 32, 33

__Solution__

Solve the following additional problems:

A1:Assuming that the largest sequence number for GBN is 15, explain why the transmission window size cannot be chosen to be 16.

A2: For the stop-and-wait protocol, under perfect channel condition (i.e., there is no channel error), what would happen if the acknowledgment is not used by the receiver while only negative acknowledgment is used? What would happen to GBN under the same scenario?

__Solution__