🚀 go-pugleaf

Hello,

     In Marshall's Open Book when discussing transport 
protocol classes three network classes (Class A, B, and C)
are defined. 

 Quote:

     Class A:  networks that detect, as an error, any loss 
	       of data.  These networks never duplicate, 
	       re-order, or corrupt data. Furthermore, a 
	       class A  network has a relatively small 
	       probaility of actually losing data. Such a
	       network provides the CONS.

     Class B:  like class A networks, class B networks detect, 
	       as an error, any loss of data. However, such losses 
	       are more common that the transport service would 
	       prefer. Class B networks aren't necessarily unreliable,
               it's just that they are less reliable than class A
	       networks.  The distinction between the two classes is 
	       decided locally. Class B provide CONS.

     End quote.

     Could anybody give me a real example of class A network and class
     B network?

   Thanks in advance!

   Zhen  Li