Dynamic scoping should be employed, but why and how? How does dynamic scoping relate to performance?

Why does the use of dynamic scoping imply the need for run-time type checking?

What is dynamic scoping, when and how is it used, and how can its performance be decreased are all questions that need to be addressed. What is dynamic scoping, when and how is it used, and how can its performance be decreased are all questions that need to be addressed.

True or false, and briefly explain your answer to each of the following questions. When the window widths of both the transmitter and receiver are 1, the alternating-bit protocol and the SR protocol are identical.