Any publicly accessible protocol, such as Ethernet (wired and wireless) can only do so much to prevent DoS/DDoS on a given open multiple access medium. You can

Any publicly accessible protocol, such as Ethernet (wired and wireless) can only do so much to prevent DoS/DDoS on a given open multiple access medium. You can certainly bake in fairness, congestion control, etc. in the protocol level, but protocols require 2 participants to follow rules/spec to work, and if one side doesn't follow the rules/spec, at the very least some bandwidth will be consumed. The only way to absolutely prevent DoS/DDoS is to have more bandwidth than all possible simultaneous attackers, or limit physical access to the medium. Cellular networks, for example, keep direct physical access to its medium under tight lock and key through proprietary, non-open-source baseband firmware.