This study investigates primary school teachers' conceptions of inter- net architecture, a largely underexplored area in early computer science educa- tion. We analyzed the conceptions of 59 pre-service and novice in-service pri- mary school teachers from the Czech Republic, who are expected to teach the functioning of the internet in their future practice. Participants drew and de- scribed their understanding of internet architecture during semi-structured online interviews. Thematic analysis revealed conceptions similar to the conceptions of children, or ones that could hinder the teachers' later understanding of how the internet functions. These findings contribute to the development of educational materials and the preparation of novice primary school teachers.
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