Brian,
When working on some of the Volume II labs I've noticed that we are sometimes not told to advertise certain networks. What do I do in this situation and how does this relate to the real lab?

In our labs we leave some ambiguity as to this issue so this means it's up to you to recognize that there is an issue and come up with a solution.  In the real lab you can expect them to explicitly tell you what to advertise and how to advertise it.  That being said if this issue does come up in the real lab don't hesitate to ask the proctor for clarification.