Question : Question on how sites connect to each other

We have a few different sites at work. All of our sites are connected via Frame. Each site has one T1 line that goes to the Frame Relay cloud.  For internet, we all have to go through our "headquarters" site. Because that is how they have it setup I guess.

Given this diagram, do you think we are using a partial mesh frame relay or full mesh?
http://mvpbaseball.cc/wan.jpg

Thanks

ps: Is that what a typical corporate network looks like?

Answer : Question on how sites connect to each other

Almost always. One reason for a full mesh topology is for redundancy and if a circuit between sites a and b goes out but the circuits between and headquarters and b and c remains up, the routers will figure out that path is available and the traffic will routed through headquarters as a matter of necessity. But as a rule your example A is dead on.

Your example B focuses a little too heavily on the proxy server.  Yes it is there and you have it configured but that is a function handled by the upper layers of the network model. The routing of the traffic through headquarters is purely based on the routing tables established on the routers.  The specification of the proxy server address  indicates where the traffic is to be routed. The 8080 is a transport layer piece of information so the proxy server will know what to do with the data when it arrives. But if you took your proxy settings out and went to yahoo.com, you would go through headquarters, not to get to the proxy server but to get to the Internet gateway.

Does that make sense? Sounds like you have a pretty good handle.

Let me suggest a book to you... one of my favorites of all time (no kidding) TCP/IP illustrated volume I by Richard Stevens. This book is amazing, you'll know so much about TCP/IP (v4 only v6 isn't covered in this book) that you'll be embarassing the network guy that told you that y'all have a full mesh!