Mario Kart World LAN play allows you to play with friends who are all in the same place, which is really the very best way to play games. It's not overly complicated to switch to LAN mode, but ...

Find out whether sleep mode or a full shutdown is better for battery life, system performance, and long-term health of your Switch.

That's why Android's private DNS mode is important. In case you don't know, DNS (or Domain Name System) is the system that links domain names to IP addresses.