What does a neighborhood network look like?

Depends on the tools/techniques/data/associations used to envision the view.

how to generate wifi heat maps and wifi coverage maps : https://www.youtube.com/watch?v=ggCgz0ZLudo

wifi heatmap software : https://www.netspotapp.com/wifi-heat-map/best-wifi-heatmap-s...

flow monitoring & visualization : https://networkstatic.net/open-source-flow-monitoring-and-vi...

network visualizataion tools : https://medium.com/@vespinozag/16-network-visualization-tool...

wiggle.net : https://www.wigle.net/

there's central box(es) that look like this that connects nearby homes: https://i.imgur.com/W2L7Nz3.png

Fiber often go to these boxes and then copper to your home, and Comcast like to lie to you and tell you fiber goes to your home