might have multiple things wrong with them or what they call faults like maybe an interface is shut down an access list is applied in the wrong direction the a tunnel interface has the wrong destination address configured so there there's tons a different variables that could come into play here as to what the problems are in the bighting is you're going to your preparation is to try to figure out a proper logical structure troubleshooting approached that you can apply to these types of I've network topologies so if you ‘rerunning around all over the place you know check router one here to record check rather 18 over there and you have no real structured as to how you're approaching the problem that's where generally you're going to runoutta time in this are this particular section because in the real world if you have some sort of network down emergency United it'll take three or four days .

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