Common Switch Configurations?

How do you have your switches configured and why?

1 LAN, 3 DTD, 1 WAN (1-3-1)?   pc, 3 bands nodes, tunnel

2 LAN, 2 DTD, 1 WAN (2-2-1)? pc/phone, 2 bands, tunnel

3 LAN, 2 DTD (3-2-0)? pc/phone/RPi, 2 bands

etc