When you don't understand things like user permissions, best is to make up some scenario's and write them down on paper. It makes these things easier to grasp, when you can strike through impossible options or for instance visualize routes or outcomes.
Visualizing on paper also works very good for debugging networking. For instance when a packet coming from the internet arrives at your gateway, how does it travel from there to it's final destination and how does it travel back? Write down at every hop the port/subnet/netmask/gateway for both the incoming and (if applicable) the outgoing interface. Works great for finding connection issues.
Document your infrastructure. Documenting in detail can show design flaws that weren't visible before. It also helps a lot to gain more insight in how everything is connected and how it works together.
When you don't understand things like user permissions, best is to make up some scenario's and write them down on paper. It makes these things easier to grasp, when you can strike through impossible options or for instance visualize routes or outcomes.
Visualizing on paper also works very good for debugging networking. For instance when a packet coming from the internet arrives at your gateway, how does it travel from there to it's final destination and how does it travel back? Write down at every hop the port/subnet/netmask/gateway for both the incoming and (if applicable) the outgoing interface. Works great for finding connection issues.
Document your infrastructure. Documenting in detail can show design flaws that weren't visible before. It also helps a lot to gain more insight in how everything is connected and how it works together.