Pen Tool adding Bezier points instead of just standard nodes?

When using the Pen tool to draw shapes, does anyone know why sometimes I get bezier nodes and other times standard nodes? I would like to be able to not have bezier nodes appear in most of my drawing (more complicated to match scanned drawings than using extra nodes).

There is nothing in the help as far as a key combination (like Option, Command or Control) to control node creation. Does anyone have an idea?

TIA

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