When Studying for my CCNA exam I had a pretty good understanding of STP but something never really clicked. Now I am studying for my CCNP Switch exam and now I am trying to make sure I have a much deeper grasp on things not only for the exam but for getting better at my job. I want to make sure I understand the path that data will take if STP is not setup in the best way. I have attached a diagram and here is my question.
Let’s say based on the diagram that the 10th floor switch (Switch D) is the Root bridge for all the VLAN’s, if a user on the 12th floor wanted to get to the server VLAN 3 it would take the path in red, correct? Or would it take the path in Blue? I think it is the path in Red but I just needed to clarify.