|This is obviously a homework question. So here is my take....|
Question 1: What does this do?
Answer 1: Study the concept first.
Question 2: What does it look like?
Answer 2: THIS is what tcp/ip stack looks like schematically.
Question 3: where is it located?
Answer 3: See Answer 1.
Just having fun doing it for you.
EDIT: I think old age is catching up with me today. Derek beat me to it!
message edited by XpUser