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The estate

Edges are A -> B : technique (difficulty). Mark footholds with entry: and crown jewels with target:. Chain hops with a -> b -> c.

The graph

Why the path, not the picture

A network diagram shows every connection at once, which is why it never answers the only question that matters in a review: given a foothold here, what is the easiest way to the domain controller, and what one fix removes the most routes? Those are a shortest-path and a cut-vertex problem, and a picture cannot do them in your head past a handful of nodes. PIVOT computes them, so you argue about the difficulty numbers — where your real judgement is — instead of tracing lines with a finger.