Misty,
I really enjoyed reading your post. While I think we agree on most. I thought your explanation of (IP) to be very helpful in my own understanding. You reinforced the fact that it gives everything a unique address. It is key to understand that fact in my opinion. Obviously, if there are multiples of the same IP then packets of data would find their way to different destinations. Thus leading to the loss or corruption of the data.
Also, being able to distinguish between the different protocols and how they interact with each other is another point that I really thought was great to mention. Great post and God Bless.